Page 1 LMV37.4... Basic unit with integrated fuel-air ratio control for forced draft burners Basic Documentation The LMV37.4 and this Basic Documentation are intended for OEMs which integrate the units in their products! Software version V03.70 CC1P7546en Building Technologies 17.12.2018...
Page 2 Supplementary documentation User Documentation Modbus AZL2 ................ A7541 Environmental Product Declaration LMV2 / LMV3 ..........E7541 Installation and Operating Instructions PC Software ACS410 ......... J7352 Data ‘Sheet LMV37.4 ....................N7546 Product Range Overview LMV2 / LMV3 ..............Q7541 2/267 Building Technologies Basic Documentation LMV37.4...
Page 3: Table Of Contents
Contents Safety notes ....................10 Warning notes ....................10 Mounting notes ....................11 Installation notes .................... 12 Electrical connection of the LMV37.4 ............13 Connection BC interface via integrated RJ11 jack (X56) ......14 ...
Page 4 7.2.2 Extraneous light ..................... 36 7.2.3 No flame at the end of safety time ..............36 7.2.4 Flame intensity ....................36 7.2.5 Supervision of flame detector ................ 36 7.2.6 Flame detection sensitivity ................37 ...
Page 5 7.7.2 Gas pilot ignition 1 «Gp1», «Gp1 mod», «Gp1 mod pneu» ......82 7.7.3 Gas pilot ignition 2 «Gp2», «Gp2 mod», «Gp2 mod pneu» ......83 7.7.4 Light oil direct ignition «Lo», «Lo mod», «Lo 2-stage», «Lo 3-stage» ... 84 ...
Page 6 10.6 Notes on settings and parameter settings ........... 114 Actuators X53 / X54 ................... 115 11.1 Function principle ..................115 11.2 Definition of angles ..................115 11.3 Referencing ....................116 11.3.1 ...
Page 7 13.3 2-stage operation ..................149 13.4 3-stage operation ..................149 Fuel meter input X75 pin 1 / X75 pin 2 ............. 150 14.1 Configuration of fuel meter ................150 14.1.1 Types of fuel meters ..................150 ...
Page 8 23.1.4.1. Display of errors (faults) with lockout ............171 23.1.4.2. Reset ......................171 23.1.4.3. Activating info / service mode from lockout ..........171 23.1.4.4. Error with safety shutdown ................172 23.1.4.5. General information ..................172 ...
Page 9 27.11.3 Setting curvepoints P0 and P9 for «G mod pneu», «Gp1 mod pneu» and «Gp2 mod pneu» ..................203 27.11.4 Warm settings for modulating operation («G mod», «Gp1 mod», «Gp2 mod» and «Lo mod») .................... 204 27.11.5 ...
Page 10: Safety Notes
LMV37.4 are safety devices! Do not open, interfere with or modify the units. Siemens does not assume responsibility for damage resulting from unauthorized interference! Additional safety notes contained in other chapters of this document must be...
Page 11: Mounting Notes
To ensure safety and reliability of the LMV37.4, the following points must also be observed:  Condensation and ingress of humidity must be avoided. Should such conditions occur, make sure that the unit is completed dry before switching on again! ...
Page 12: Installation Notes
Installation notes  Always run the high-voltage ignition cables separate from the unit and other cables while observing the greatest possible distances  Ensure that the electrical wiring inside the boiler is in compliance with national and local safety regulations ...
Page 13: Electrical Connection Of The Lmv37.4
1.4 Electrical connection of the LMV37.4 The LMV37.4 operates with the following low-voltages:  SELV (Safety Extra Low-Voltage) and PELV (Protective Extra Low-Voltage) ensure protection against electric shock hazard  FELV (Functional Extra Low-Voltage) without safe separation offers no protection which, in the event of fault, would not exclude risks Mains voltage Mains voltage...
Page 14: Connection Bc Interface Via Integrated Rj11 Jack (X56)
Signal cable from LMV37.4 to AZL2 must conform to certain specifications. Siemens has specified the signal cable for use under the burner hood. When using other signal cables, it is not guaranteed that the required cable features will be met.
Page 15: Electrical Connection Of Flame Detectors
Electrical connection of flame detectors It is important to achieve practically disturbance-free and loss-free signal transmission:  Never run the detector cables together with other cables – Line capacitance reduces the magnitude of the flame signal – Use a separate cable ...
Page 16 The functions of the following available or required input status signals must be checked:  Air pressure  Minimum gas pressure / maximum gas pressure or POC  Gas pressure valve proving  Minimum oil pressure and maximum oil pressure ...
Page 17: Notes On Settings And Parameter Settings
A password protects the parameter level against unauthorized access. The OEM allocates individual passwords to the setting levels he can access. The default passwords used by Siemens must be changed by the OEM. These passwords are confidential and may only be given to persons authorized to access such setting levels ...
Page 18: Standards And Certificates
The electrical connections of the LMV37.4 comply with the requirements of EN 60335-2-102. EAC Conformity mark (Eurasian Conformity mark) ISO 9001:2015 ISO 14001:2015 OHSAS 18001:2007 China RoHS Hazardous substances table: http://www.siemens.com/download?A6V10883536 Type ● ● ● ● LMV37.400A2 ● ●...
Page 19: Service Notes
1.10 Service notes  If fuses are blown, the unit must be returned to Siemens (refer to chapter Warning notes)  Error diagnostics can only be made via the LMV37.4 (BC interface)  Note! Only authorized persons may replace the fuse (according to EN 298-1, chapter 9.2.r) 1.11 Life cycle...
Page 20: Makeup Of Structure / Function Description
Makeup of structure / function description The LMV37.4 is a microprocessor-based burner management system with matching system components for the control and supervision of forced draft burners of medium to high capacity. Integrated in the LMV37.4 are:  Burner management system complete with valve proving system ...
Page 21: General Information
2.3 General information The burner management system is operated and parameterized either via the AZL2 display and operating unit or with the help of the PC software ACS410. The AZL2 with LCD and menu-driven operation facilitates straightforward use and targeted diagnostics. When making diagnostics, the display shows the operating states, the type of error and the point in time the error occurred.
Page 22: Technical Data
Technical Data 4.1 Basic unit LMV37.4 Mains voltage  LMV37.420A1 AC 120 V -15% / +10%  LMV37.400A2 AC 230 V -15% / +10% Mains frequency 50 / 60 Hz ±6% Power consumption <30 W (typically) Safety class I, with parts according to II and III to DIN EN 60730-1 Degree of protection IP00 to DIN EN 60529...
Page 23: Terminal Loading "Inputs
4.1.1 Terminal loading «Inputs»  Perm. mains primary fuse Max. 16 AT (externally)  Unit fuse (F1) (internally) 6.3 AT (DIN EN 60127 2 / 5)  Mains supply: Input current depending on the operating state of the unit Undervoltage ...
Page 24 Individual contact loading: Fan motor contactor  Rated voltage - LMV37.420A1 AC 120 V, 50 / 60 Hz - LMV37.400A2 AC 230 V, 50 / 60 Hz  Rated current - LMV37.420A1 - LMV37.400A2 1,6 A pilot duty load declaration to UL372 ...
Page 25: Analog Output / Load Output X74 Pin 3
4.1.3 Analog output / load output X74 pin 3 Accuracy of output voltage ±1% 4.1.4 Cable lengths  Mains line AC 120 V / AC 230 V Max. 100 m (100 pF/m)  Display, BC interface For installation under the burner hood or in the control panel Max.
Page 26: Signal Cable Agv50 From Azl2  Bc Interface
4.2 Signal cable AGV50 from AZL2  BC interface Signal cable Color white Unshielded Conductor 4 x 0.141 mm² With RJ11 plug Cable length  AGV50.100  AGV50.300 Location Under the burner hood (extra measures required for SKII EN 60730-1) 4.3 Environmental conditions Storage DIN EN 60721-3-1...
Page 27: Flame Detector
4.4 Flame detector 4.4.1 Ionization probe For continuous operation! No-load voltage at ION terminal Approx. U Mains (X10-05 pin 2) Caution! The ionization probe must be protected against electric shock hazard! Short-circuit current Max. AC 1 mA Required detector current Min.
Page 28 Threshold values when flame is supervised by an ionization probe:  Start prevention (extraneous light) Intensity of flame (parameter 954) ≥18%  Operation Intensity of flame (parameter 954) >24% Ionization input Ionization current in µA Figure 5: Ionization input at AC 120 V / AC 230 V Measuring circuit for Ionization probe detector current...
Page 29: Uv Flame Detectors Qra2 / Qra4 / Qra10
4.4.2 UV flame detectors QRA2 / QRA4 / QRA10 Caution! If QRA2-UV tubes / QRA4-UV tubes / QRA10-UV tubes are used for flame supervision on the LMV37.4, it must be ensured that the LMV37.4 is permanently connected to power (EN 298), thus enabling the LMV37.4 to detect flame detector failures during startup and shutdown.
Page 30: Photoresistive Flame Detectors Qrb1 / Qrb3
4.4.3 Photoresistive flame detectors QRB1 / QRB3 No-load voltage at QRB1/QRB3 terminal Approx. DC 5 V (X10-05 pin 3) Max. perm. length of QRB1/QRB3 3 m (wire – wire 100 pF/m) detector cable (laid separately)  Note A detector resistance of RF <500  is identified as a short-circuit and leads to safety shutdown in operation as if the flame had been lost.
Page 31: Yellow Flame Detector Qrb4
4.4.4 Yellow flame detector QRB4 Open-circuit voltage at terminal QRB4 Approx. 5 V DC (X10-05 pin 3) Permissible length of QRB4 detector 3 m (wire to wire100 pF/m) cable (laid separately) Threshold values when flame is supervised by QRB4 Start prevention (extraneous light) Flame intensity (parameter 954) ≥10% Operation Flame intensity (parameter 954) >16%...
Page 32: Blue-Flame Detectors Qrc
4.4.5 Blue-flame detectors QRC Check the intensity of flame with the AZL2. For system-specific reasons, the display of maximum flame intensity by the AZL2 is limited to approx. 55%. Caution! Flame detectors QRC are only suited for AC 230 V operation. Start prevention (extraneous light) with Ca.
Page 33: Dimensions
Dimensions 5.1 LMV37.4 Dimensions in mm 82,5 22,8 17,3 10,2 12,5 23,5 7546m02/0307 27,2 82,5 128,5 Figure 10: Dimension LMV37.4 33/267 Building Technologies Basic documentation LMV37.4... CC1P7546en 5 Dimensions 17.12.2018...
Page 34: Display And Diagnostics
Display and diagnostics Transmission of operating states, fault status messages and detailed service information via: BCI communication via integrated RJ11 jack to the AZL2 display and operating unit, or via additional OCI410 interface to ACS410 PC software Communication / parameterization AZL2 The AZL2 offers ease of operation, parameterization and targeted diagnostics via features menu-driven operation.
Page 35: Flame Detectors
7.2 Flame detectors For display of the flame on the AZL2, the following general conditions apply:  Display is subject to various component tolerances, which means that deviations of 10% can occur  Note that, for physical reasons, there is no linear relationship between flame display and detector signal values The LMV37.4 can be used with different types of flame detectors.
Page 36: Extraneous Light
7.2.2 Extraneous light Extraneous light in standby mode (phase 12) leads to start prevention, followed by a restart. Extraneous light during the prepurge phase results in immediate lockout. If extraneous light occurs during the shutdown phase, the LMV37.4 switches to the safety phase.
Page 37: Flame Detection Sensitivity
7.2.6 Flame detection sensitivity For applications with a high degree of modulation (e.g. 1:15 / 1:20), it may be necessary to increase the flame detection sensitivity. This can be carried out via parameters for flame detection with ionization probe or UV flame detector QRA. The ignition (phases 40...52) always takes place with standard flame sensitivity.
Page 38: Digital Inputs
7.3 Digital inputs 7.3.1 Safety loop X3–04 pin 1 and 2 Input for connection of the safety loop. When any of the series-connected contacts included in the loop opens, power supply to the fuel valves, the fan and the ignition equipment is instantly cut.
Page 39: Burner Flange X3-03, Pin 1 And 2
7.3.2 Burner flange X3–03, pin 1 and 2 End switch burner flange (component of safety loop). LMV... Flange “L” for end switch burner flange End switch burner flange (component of safety loop) Bild 274e/1010 Figure 14: Burner flange X3-03 For error diagnostics and parameters, refer to chapter Safety loop. 7.3.3 Input for external load controller (ON / OFF) X5–03, pin 1 When the external control loop is closed, the internal input message «Heat request»...
Page 40: Air Pressure Switch X3-02
7.3.5 Air pressure switch X3-02 Input for connection of an air pressure switch. Air pressure is anticipated when the fan is switched on. If there is no air pressure signal, the system initiates lockout. The air pressure switch must have an NO contact. If no air pressure switch is required (e.g.
Page 41: Gas Pressure Switch Valve Proving - Or Heavy Oil Direct Start X9-04
7.3.6 Gas pressure switch valve proving – or heavy oil direct start X9-04 Input for connection of Pressure switch valve proving X9-04. The input is active only when operating on gas and when valve proving is activated (refer to chapter Program sequence).
Page 42 Heavy oil direct start When firing on heavy oil, input X9-04 is used for the heavy oil direct start signal. Parameter 286 can be used to define the time of the evaluation; parameter 287 to define the maximum waiting time for heavy oil circulation. Parameter Oil: Evaluation of heavy oil direct start 0 = only start signal in phase 38...
Page 43: Gas / Oil Pressure Switch-Min, Start Release Gas X5-01
7.3.7 Gas / oil pressure switch-min, start release gas X5–01 Input for connection of a pressure switch-min for gas or oil: If the plant does not require a pressure switch-min, a wire link must be fitted between pin 2 and 3. Gas pressure switch-min The LMV37.4 enables parameterization of which gas train position the gas pressure switch-min is mounted on.
Page 44 If the gas pressure fails, at least a shutdown will be initiated. Error Diagnostic Meaning for the LMV37.4 code code Pressure switch-min No minimum gas pressure Gas shortage start prevention Pressure switch-min No minimum gas pressure Gas shortage start prevention For the input, a repetition counter can be parameterized.
Page 45: Setting The Time For Making The Pressure Switch Test
Oil pressure switch-min In all types of oil train, the minimum oil pressure is expected from phase 38. If no oil pressure is detected when the maximum time (parameter 217) has elapsed or if, subsequently, the oil pressure drops, the system initiates lockout. Parameter Maximum wait time for detecting a detector signal or pressure switch signal (e.g.
Page 46: Gas / Oil Pressure Switch-Max / Or Poc Contact, Start Release Oil / Additional Speed-Dependent Air Pressure Switch X5-02
7.3.9 Gas / oil pressure switch-max / or POC contact, start release oil / additional speed-dependent air pressure switch X5-02 Input for connection of a pressure switch-max for gas or oil: The pressure switch must have an NC contact, which means that the contact opens when the adjusted maximum pressure is exceeded.
Page 47 Oil pressure switch-max In all types of oil trains, the maximum oil pressure is monitored from phase 22. If the maximum oil pressure is exceeded after the maximum time (parameter 214) has elapsed, or during the subsequent phases, the system initiates lockout. Parameter Maximum time to start release Error...
Page 48 Additional speed-dependent air pressure switch In this setting, an additional speed-dependent air pressure switch can be connected on the input. The input is evaluated depending on the actual recorded speed. The actual speed must be identified through a speed recording process (see Chapter 12.7 Acquisition of speed).
Page 49: Reset X8-04, Pin 1
7.3.10 Reset X8-04, pin 1 Input for connection of a reset button. The LMV37.4 can be reset or manually locked via this input (refer to chapter Reset / manual locking). Resetting / manual interlocking Bild 393e/1109 Figure 22: Reset X8-04 49/267 Building Technologies Basic documentation LMV37.4...
Page 50: Digital Outputs
7.4 Digital outputs Safety-related outputs, type SI Using a contact feedback network, these contacts are read back by the microcomputers and checked for their correct positions. Non-safety-related outputs, type No-SI These outputs are not monitored by the contact feedback network and, for this reason, can only be used for non-safety-related actuators, or actuators made safe in some other form (e.g.
Page 51: Output Ignition Type Si (Ignition) X4-02
7.4.4 Output ignition type SI (IGNITION) X4-02 LMV... Ignition (Z) Protective earth (PE) Bild 285e/0409 Figure 26: Output ignition X4-02 Output for the connection of ignition transformers or electronic ignition modules. When firing on gas, ignition is switched on just prior to the first safety time in phase 38. The preignition time in phase 38 can be parameterized.
Page 52: Outputs Fuel Valves Type Si V1 / V2 / V3 / Pv) X8-02, X7-01, X7-02
7.4.5 Outputs fuel valves type SI V1 / V2 / V3 / PV) X8-02, X7- 01, X7-02 LMV... Protective earth (PE) Auxiliary terminal V1 for series connection of two AC 115 V valves Fuel valve 1 (V1) Bild 286e/0409 Figure 27: Output fuel valve V1 X8-02 LMV...
Page 53: Program Sequence
7.5 Program sequence The program sequence is shown in the form of sequence diagrams (refer to chapter Fuel trains). Using a number of parameters, the program sequence can be adapted to the respective application. 7.5.1 Time parameters Using a number of time parameters, the time characteristics of the different types of fuel trains can be matched to the requirements of the respective application.
Page 54: Valve Proving
7.5.2 Valve proving Valve proving is only active when firing on gas. Valve proving designed to detect leaking gas valves and, if necessary, to prevent the valves from opening or ignition from being switched on. Lockout is initiated, if required. When performing valve proving, the gas valve on the burner side is opened first to bring the test space to atmospheric pressure.
Page 55: Valve Proving With Separate Pressure Switch X9-04
It must be ensured that the 2 test times are correctly set. It is to be checked whether the gas required for the test may be fed into the combustion chamber (on the relevant application). The test times are safety-related. After a reset and in the case of aborted or prevented valve proving, the unit performs valve proving on the next startup (only when valve proving is activated).
Page 56: Valve Proving Via Gas Pressure Switch-Min X5-01
7.5.3.1. Valve proving via gas pressure switch-min X5-01 Step 1: t80 – evacuation of test space. P LT (Pmin) Gas valve on the burner side is opened to bring the test space to atmospheric pressure. Step 2: t81 – test time atmospheric pressure. When the gas has closed, the gas pressure in the test space must not exceed a certain level.
Page 57: Safety Phase (Phase 01)
7.5.3.3. Safety phase (phase 01) The safety phase is an intermediate phase which is completed prior to triggering lockout. The relays of the fuel valves and the safety relay (fan) are deenergized, but lockout does not yet take place. The alarm relay is not yet activated. If possible or permitted, safety checks or repetition counter checks are made whose results decide on the transition to Lockout phase or Standby.
Page 58: Special Functions During The Program Sequence
7.5.4 Special functions during the program sequence 7.5.4.1. Reset / manual lockout The LMV37.4 can be manually locked by simultaneously pressing the Info button and any other button on the AZL2. This function enables the operator to lock the LMV37.4 from any of the operating levels or, in other words, to trigger non-volatile lockout.
Page 59: Alarm Upon Start Prevention
Resetting via the PC software ACS410 Refer to the documentation covering the PC software ACS410 (J7352). Error Diagnostic Meaning for the LMV37.4 code code Manual lockout by PC software ACS410 7.5.4.2. Alarm upon start prevention If start prevention occurs, it is shown on the display of the AZL2. Start prevention takes place only when a heat request is delivered and when one of the startup criteria is not fulfilled.
Page 60: Possible Start Preventions
7.5.4.3. Possible start preventions On the normal display, error code 201 is translated to text display OFF UPr (UPr = unprogrammiert = not programmed); the numerical value appears in the error history. Error Diagnostic Meaning for the LMV37.4 code code No operating mode selected OFF UPr 2…3...
Page 61 Functions with adjustable repetition counter Parameter Repetition limit no flame at the end of safety time 1 = no repetition 2...4 = 1...3 repetitions Recharging time: Entering into operation Repetition limit heavy oil direct start 1 = no repetition 2...15 = 1...14 number of repetitions 16 = constant repetition Recharging time: End of Shutdown phase...
Page 62 Error Diagnostic Meaning for the LMV37.4 code code No flame at the end of the first safety time Air pressure Loss of flame Pressure switch-min No minimum gas / oil pressure Safety loop / burner flange open OFF S Heavy oil direct start Error during VSD’s speed standardization Speed error VSD Referencing error ones actuators...
Page 63: Start Without Prepurging (As Per En 676)
7.5.4.5. Start without prepurging (as per EN 676) When using valve proving and 2 fuel valves of class A, prepurging is not required (conforming to EN 676). Prepurging can be deactivated per parameter. Parameter Gas: Prepurging 0 = deactivated 1 = activated When prepurging is activated, it is performed in accordance with the adjusted prepurge time.
Page 64: Gas Shortage Program
7.5.4.6. Gas shortage program Valve proving via gas pressure switch-min (parameter 236 = 2) As gas pressure switch-min is located between the valves, the gas shortage test cannot be made in phase 22. Instead, when performing valve proving on startup, the gas shortage test is performed at the end of the filling time (end of phase 82).
Page 65: Program Stop Function
7.5.4.7. Program stop function To simplify the burner settings in connection with commissioning and service work, the program sequence of the LMV37.4 can be stopped at the following positions: 1) Air damper in prepurge position 2) Ignition position 3) Interval 1 4) Interval 2 The program stops are integrated in the setting sequence when the plant is commissioned (refer to chapter Air-fuel ratio curves –...
Page 66: Continuous Fan
7.5.4.10. Continuous fan With burners that can be damaged by heat (e.g. several burners using the same combustion chamber), continuous purging may be required. In that case, the fan operates continuously in all phases. For that purpose, the fan motor contactor is to be connected to X3-05, pin 3, tapped after the unit fuse and the safety loop.
Page 67: Test Function For Approval Of Burner - Loss-Of-Flame Test (Tüv Test)
7.5.4.11. Test function for approval of burner – loss-of-flame test (TÜV test) The purpose of this test is to verify the detection time required in the event of loss of flame when applying for burner approval. When starting the test, the fuel valves are shut to determine the time (resolution of 0.2 seconds) until the LMV37.4 detects loss of flame.
Page 68: Postpurging In The Lockout Position
When the Postpurging in the lockout position function is used, the fan may only be powered via a contactor and must not be connected directly to LMV37.4 (X3- 05 pin 1)! Siemens Micromaster 440 Standardization of speed X74 pin 1 DC 24 V external +24 V X74 pin 3 VSD control DC 0/2...10 V...
Page 69: Switching Back To Pilot
7.5.4.13. Switching back to pilot The function must be selected with parameter 191. This deactivates the OPEN / CLOSE load controller contacts (X5-03 pin 2 or 3). Contact X5-03 pin 2 is evaluated as the input signal for Switching back to pilot. The function can be started either by a low or high signal.
Page 70 RWF55 application examples: The setting must be set to low active to use the RWF55. The load controller ON signal (X5-03 pin 1 / pin 4) is applied at RWF55 (contacts 1P and 1N). The signal for switching back to pilot (X5-03 pin 2) is connected to RWF55 (contacts 6N and 6P). Function Ik5 must be selected at RWF55.
Page 71: Fuel Trains (Application Examples)
7.6 Fuel trains (application examples) Gas direct ignition (Operating mode 1, 7, 14, 19, Program Direct ignition Figure 42: Gas direct ignition Gas pilot ignition 1 (Operating mode 2, 8, 15, 20) Program Gas pilot Figure 43: Gas pilot ignition 1 Gas pilot ignition 2 (Operating mode 3, 9, 16, 21, Program...
Page 72 Fuel valve control Gas (always modulate) Legend for fuel trains: Not used For the valve proving function, the pressure switch-min is located between the fuel valve V1 / V2 Heavy oil Light oil Normally Open P LT Valve proving Pmax Pressure switch-max Pmin Pressure switch-min Pilot valve Actuator...
Page 73 Light oil direct ignition, multistage (Operating mode 5, 17) 1-stage burner Program 7546s04e/1107 Figure 46: Light oil direct ignition, 1-stage (Operating mode 5, 17) 2-stage burner Program 7546s05e/1107 Figure 47: Light oil direct ignition, 2-stage (Operating mode 6, 18) 3-stage burner Program 7546s06e/1107 Figure 48: Light oil direct ignition, 3-stage...
Page 74 Light oil direct ignition, modulating (Operating mode 4, 22) Modulating burner (without shutdown facility for adjustable head) Program 7546s07e/1107 Figure 49: Light oil direct ignition, modulating (Operating mode 4, 22) Modulating burner (with shutdown facility for adjustable head) Program 7546s08e/1107 Figure 50: Light oil ignition, modulating Light oil (transformer for direct ignition) and heavy oil without separate circulation control Fuel valve control...
Page 75 Light oil direct ignition modulating with 2 fuel valves (Operating mode 12) Modulating burner (without shutdown facility for adjustable head) LO-2V Program Figure 52: Light oil direct ignition, modulating, without shutdown facility for adjustable head (Operating mode 12) Modulating burner (with shutdown facility for adjustable head) LO-2V Program Figure 53: Light oil direct ignition, modulating, with shutdown facility for adjustable head...
Page 76 Light oil with gas pilot ignition (Operating mode 3, 9, 16, 21) LOgp Program V2-Oil V1-Oil SV-Oil Light oil PV-Gas (Operating mode 10, 11) Figure 55: Light oil with gas pilot ignition Fuel valve control Light oil (with gas pilot ignition) Legend for fuel trains: Heavy oil Light oil...
Page 77 Light oil with gas pilot ignition with 2 fuel valves (Operating mode 3, 9, 16, 21) LOgp-2V Program V2-Oil SV-Oil V1-Oil Light oil PV-Gas (Operating mode 13) Figure 57: Light oil with gas pilot ignition Fuel valve control Light oil (with gas pilot ignition) Legend for fuel trains: Heavy oil Light oil...
Page 78 Heavy oil direct ignition, multistage (Operating mode 24) 2-stage burner Program HO m. Umsp LMV37 - Heavy oil direct start - input - with circulation control Bild 424e/0913 Figure 59: Heavy oil direct ignition, 2-stage, with circulation control Heavy oil direct ignition, modulating Modulating burner (Operating mode 23)
Page 79 Fuel valve control Heavy oil (transformer direct ignition) with circulation control Legend for fuel trains: Heavy oil Light oil V3 (= stage 2) Air damper Normally Open position Air damper P LT Valve proving Pmax Pressure switch-max Pmin Pressure switch-min Pilot valve Actuator Safety valve (outdoors)
Page 80: Sequence Diagrams
7.7 Sequence diagrams The phase numbers given in the sequence diagrams can be read from the following process data: Parameter Phase (state of external module and display) 80/267 Building Technologies Basic documentation LMV37.4... CC1P7546en 7 Basic unit LMV37.4 17.12.2018...
Page 81: Gas Direct Ignition "G", "G Mod", "G Mod Pneu
7.7.1 Gas direct ignition «G», «G mod», «G mod pneu» 30 s RAST plug Function / Inputs pin number X3-04 pin 1/2 X5-03 pin 1/4 R (ON) X10-05 pin 2 / pin 3/4 X10-06 pin 1/2 X3-02 pin 1/2 X5-01 pin 2/3 X5-01 pin 2/3 X5-02 pin 2/3 X9-04 pin 2/3...
Page 82: Gas Pilot Ignition 1 "Gp1", "Gp1 Mod", "Gp1 Mod Pneu
7.7.2 Gas pilot ignition 1 «Gp1», «Gp1 mod», «Gp1 mod pneu» 30 s RAST plug Function / inputs pin number X3-04 pin 1/2 X5-03 pin 1/4 R (ON) X10-05 pin 2 / pin 3/4 X10-06 pin 1/2 X3-02 pin 1/2 X5-01 pin 2/3 X5-01 pin 2/3 X5-02 pin 2/3...
Page 83: Gas Pilot Ignition 2 "Gp2", "Gp2 Mod", "Gp2 Mod Pneu
7.7.3 Gas pilot ignition 2 «Gp2», «Gp2 mod», «Gp2 mod pneu» 30 s RAST plug Function / inputs pin number X3-04 pin 1/2 X5-03 pin 1/4 R (ON) X10-05 pin 2 / pin 3/4 X10-06 pin 1/2 X3-02 pin 1/2 X5-01 pin 2/3 X5-01 pin 2/3 X5-02 pin 2/3...
Page 84: Light Oil Direct Ignition "Lo", "Lo Mod", "Lo 2-Stage", "Lo 3-Stage
7.7.4 Light oil direct ignition «Lo», «Lo mod», «Lo 2-stage», «Lo 3-stage» 30 s RAST plug Function / Inputs Pin number X3-04 Pin 1/2 R (ON) X5-03 Pin 1/4 X10-05 Pin 2 / Pin 3/4 X10-06 Pin 1/2 X3-02 Pin 1/2 X5-01 Pin 2/3 X5-02 Pin 2/3 POC *)
Page 85: Light Oil Pilot Ignition "Logp" "Logp Mod" "Logp 2 Stage
7.7.5 Light oil pilot ignition «LoGp» «LoGp mod» «LoGp 2 stage» 30 s RAST plug Function / inputs pin number X3-04 pin 1/2 R (ON) X5-03 pin 1/4 X10-05 pin 2 / pin 3/4 X10-06 pin 1/2 X3-02 pin 1/2 X5-01 pin 2/3 X5-02 pin 2/3 POC *)
Page 86: Heavy Oil Direct Ignition "Ho", "Ho Mod Separate Circulation Control", "Ho 2-Stage Separate Circulation Control
7.7.6 Heavy oil direct ignition «Ho», «Ho mod separate circulation control», «Ho 2-stage separate circulation control» 30 s RAST plug Function / inputs pin number X3-04 pin 1/2 X5-03 pin 1/4 R (ON) X10-05 pin 2 / pin 3/4 X10-06 pin 1/2 X3-02 pin 1/2 X5-01 pin 2/3 X5-02 pin 2/3...
Page 87: Heavy Oil Direct Ignition "Ho", "Ho Mod Without Circulation Control", "Ho 2- Stage Without Circulation Control", "Ho 3-Stage Without Circulation Control
7.7.7 Heavy oil direct ignition «Ho», «Ho mod without circulation control», «Ho 2-stage without circulation control», «Ho 3- stage without circulation control» 30 s RAST plug Function / inputs pin number X3-04 pin 1/2 X5-03 pin 1/4 R (ON) X10-05 pin 2 / pin 3/4 X10-06 pin 1/2 X3-02 pin 1/2...
Page 88: Legend To The Sequence Diagrams
7.7.8 Legend to the sequence diagrams  Note Not all phases, times, indices, abbreviations and symbols appear in the individual sequence diagrams or are needed there! Phase numbers Lockout phase Safety phase Home run Standby (stationary) Fan motor = ON, safety valve = ON Air damper ...
Page 89 Indices Parameter: Short/long prepurge time for oil only Short/long oil pump – ON – time Only with valve proving during startup Parameter: With/without alarm in the event of start prevention If signal is faulty in the startup phase, phase 10 is next, otherwise phase 70 Maximum time safety phase, then lockout Time from occurrence of start prevention to signaling Only in case of valve proving during startup (valve proving via pressure switch-...
Page 90 Symbols Permissible position range In Standby mode: Actuator is allowed to travel within the permissible position range, but is always driven to the home position; must be in the home position for phase changes 0°/10% Position as supplied (0°) 90°/100% Actuator fully open (90°) Input/output signal 1 (ON) Input/output signal 0 (OFF)
Page 91: Selection Of Operating Mode
Selection of operating mode To facilitate straightforward adaptation of the LMV37.4 to different types of burners, the LMV37.4 offers automatic configuration of the operating mode. This means that – derived from parameter 201 – the most important settings relating to the operating mode are made automatically.
Page 92 Description Modulating Gas direct ignition, electronic modulating ratio control. G mod ● ● ● electronic Optional with VSD with speed feedback signal Modulating Gas pilot ignition 1, electronic modulating ratio control. Gp1 mod ● ● ● electronic Optional with VSD with speed feedback signal Modulating Gas pilot ignition 2, electronic modulating ratio control.
Page 93: Deleting Curves
Description Ho mod Modulating ● ● ● Heavy oil direct ignition, with circulation control, electronic separate electronic modulating ratio control. circulation Optional with VSD with speed feedback signal control Ho 2 stage 2-stage ● ● Heavy oil direct ignition, with circulation control, electronic 2-stage separate ratio control.
Page 94: Connection To Load Controllers
Connection to load controllers The LMV37.4 can be connected to different load controllers. Heat request and the required burner output are determined in accordance with the priorities of the different load sources. 9.1 Load controller ON contact X5-03 pin 1 This contact is given priority over all load controller sources.
Page 95 Multistage operation X5-03 (stage 2, pin 3 / stage 3, pin 2) In multistage operation, 1 or 2 thermostats can be connected to activate the different burner stages. Multistage operation is possible only when firing on oil. If neither input «Stage 2» nor input «Stage 3» is active, the burner switches to «Stage 1».
Page 96 Shifting multistage operation (OPEN pin 3 / CLOSE pin 2) Using a simple thermostat, a modulating burner can be operated in shifting 2-stage mode. In that case, there must be a firm connection between terminal CLOSE and the live conductor (L), and terminal OPEN must be connected to the thermostat or the load controller.
Page 97: Default Output Via Building Automation - X92
9.3 Default output via building automation – X92 To control the LMV37.4, the building automation system can predefine an output via a bus system. The building automation system is connected to the LMV37.4 via the X92 interface. Burner startup can take place only when contact X5-03 pin 1 is closed (load controller ON / OFF).
Page 98 Behavior in the event the building automation and control system fails If the LMV37.4 receives no more data from building automation, it will deliver the output set with parameter 148. The time that elapses until communication breakdown is detected can be set via parameter 142.
Page 99: Manual Output
9.4 Manual output A manual output can be set with the Normal display of the AZL2 or via the PC software ACS410. Manual output via the AZL2 Manual output can be activated or adjusted by pressing the F button for at least 1 second and by pressing the + or –...
Page 100: External Load Controller Via Analog Input X64 Pin 1 / X64 Pin 2
9.6 External load controller via analog input X64 pin 1 / X64 pin 2 For the preselection of external outputs, an analog 4…20 mA input is provided. Burner startup can take place only when contact X5-03 pin 1 is closed (load controller ON / OFF).
Page 101: Switching Thresholds For Multistage Operation
9.6.2 Switching thresholds for multistage operation For multistage operation, a hysteresis band about the thresholds is introduced. This hysteresis band replaces the minimum positioning step used in multistage operation. The band width is approx. 1 mA. 2-stage operation Actual value Current Display / output value Stage 1...
Page 102: Prioritization Of Load Controller Sources
9.7 Prioritization of load controller sources To simplify configuration of the LMV37.4, the load controller source need not be selected. The LMV37.4 automatically detects the available load controller sources and selects them. If several sources are used, they are selected according to the following priorities: Parameter 942 Priority...
Page 103: Emergency Operation With Several Load Controller Sources
9.7.1 Emergency operation with several load controller sources By making use of the prioritization described above, it is also possible to implement emergency operation. Should the building automation and control LMV37.4 fail (provided parameter 148 is set to undefined (--)), the unit switches automatically over to the external load controller.
Page 104: Electronic Ratio Control
10 Electronic ratio control 10.1 General Electronic ratio control is used to control the burner’s actuators depending on burner output. It is possible to connect 2 actuators and, optionally, 1 VSD. Resolution is 0.1° with the actuators and 0.1% with the VSD. Output can be regulated in increments of 0.1% in modulating mode and with a maximum of 3 stages in multistage mode.
Page 105: Prepurging
10.2.3 Prepurging This position is approached in phase Traveling to prepurging (24). The position can be set via the following parameters: Parameter Actuator 501.01 Prepurge position fuel actuator 502.01 Prepurge position air actuator 503.01 Prepurge speed VSD Parameter Gas: Prepurging 0 = inactive 1 = active Oil: Prepurging...
Page 106: Modulating Operation
10.3 Modulating operation In modulating mode, it is possible to operate 2 actuators and 1 VSD. The burner‘s output can be regulated between 20% (low-fire) and 100% (high-fire) in increments of 0.1%. Since the actuators are never allowed to operate simultaneously, the output is increased in small steps of 1%.
Page 107: Traveling Speed / Maximum Curve Slope
10.3.2 Traveling speed / maximum curve slope The rise time required to modulate from low-fire to high-fire can be set via parameter 544. The following maximum curve slopes (positioning angle) can be achieved depending on the set ramp-up time (parameter 544): Modulation Modulation Modulation...
Page 108: Entering The Running Position
VSD / PWM fan For the VSD or the PWM fan, it is also possible to change the maximum speed differential between 2 curvepoints via the no-load time for the speed measurement in modulating operation. This is 200 ms (value 8) in the default setting and can be reduced to 100 ms (value 4).
Page 109: Limitation Of Modulation Range
10.3.5 Limitation of modulation range If the modulation range shall be further restricted from 20 to 100% against the defined curve, 2 parameters are available to define a new low-fire and high-fire position. Parameter Lower output limit undefined = 20 % Upper output limit undefined = 100 % Figure 75: Restriction of modulation range...
Page 110: Setting The Minimum And Maximum Output
10.3.6 Setting the minimum and maximum output When changing the setting of minimum and maximum output after making the curve settings, following is to be observed: After leaving the curve settings with completely defined curvepoints, proceed in modulating operation by setting the minimum / maximum output (parameter 546). In case of the warm setting, the parameterized output remains active until setting of the minimum / maximum output is completed.
Page 111: Multistage Operation
10.4 Multistage operation This operating mode is only available when firing on oil. There is a choice of 2-stage and 3-stage operation. Hence, the burner’s output can be modulated via 2 or 3 stages. Modulation is accomplished by adjustment of the air actuator or the VSD and by switching the fuel valves for adjusting the amount of fuel.
Page 112: Adjustment Of Output
10.4.3 Adjustment of output When the output increases, the LMV37.4 moves from the curvepoint of stage 1 (P1) to the switch-on point of stage 2 (P2on). If the switch-on point is exceeded, the valve for the second stage is switched on. Then, the LMV37.4 moves to the curvepoint for stage 2 (P2).
Page 113: Limitation Of Modulation Range
10.4.6 Limitation of modulation range If the modulation range for stage 1 and stage 2, or stage 3, shall be further restricted, 2 parameters can be used to define a new low-fire and high-fire position. Parameter Lower output limit undefined = 20 % Upper output limit undefined = 100 % 10.5 End of operating position...
Page 114: Notes On Settings And Parameter Settings
The parameter level is password-protected. The OEM assigns individual passwords to the parameter levels he can access. The unit is supplied with default passwords entered by Siemens; they must be changed by the OEM. These passwords are confidential and may be assigned to authorized personnel only ...
Page 115: Actuators X53 / X54
11 Actuators X53 / X54 One or 2 actuators can be connected to the LMV37.4, depending on the selected operating mode (refer to chapter Selection of operating mode). Caution! When mounting the actuators, it must be made certain that the mechanical link to the controlling elements is rigid! LMV...
Page 116: Referencing
11.3 Referencing An incremental transducer is used for position feedback. This means that referencing of the actuators must be performed after power-ON. In addition, at the end of each shutdown in phase 10, the actuators are referenced to ensure that individual stepping errors, which could lead to shutdown, do not accumulate.
Page 117 Parameter Ramp modulating Selection of reference point Index 0 = fuel Index 1 = air Setting values: 0 = closed (<0°) 1 = open (>90°) Actuator's direction of rotation Index 0 = fuel Index 1 = air Setting values: 0 = counterclockwise 1 = clockwise (exclusively for SQM3) Tolerance limit of position monitoring (0.1°) Index 0 = fuel...
Page 118: Reference Travel
11.3.1 Reference travel Reference travel means that different reference travels are performed, aimed at unambiguously determining the actuators’ permissible working range. This prevents the actuators from traveling to a range outside the optical feedback system or against a mechanical stop should a power failure during referencing occur. Parameter 611 must be set depending on the mechanical construction and the type of actuator used.
Page 119 Example of actuator with counterclockwise rotation: When referencing in the Close position, the actuator first travels a certain distance into the working range (toward the Open position). Then, it travels to a position representing maximum -7.7°, thereby crossing the reference mark for the first time. Then, the actuator moves in the other direction again and detects the inner ramp of the reference mark.
Page 120: Direction Of Rotation
11.4 Direction of rotation With the SQM3 actuator, the direction of rotation can be selected on an individual basis. Parameter 602.00 Actuator's direction of rotation Index 0 = fuel Setting values: 0 = counterclockwise 1 = clockwise (exclusively for SQM3) 602.01 Actuator's direction of rotation Index 1 = air...
Page 121: Monitoring The Actuator Positions
11.5 Monitoring the actuator positions To monitor the actuator’s current positions, an optical incremental transducer with a resolution of 0.7° is used. The correct position of the drive shaft is ensured by comparing the motor steps made with the position obtained from the incremental transducer.
Page 122 Parameter Tolerance limit of position monitoring (0.1°) Index 0 = fuel Index 1 = air Greatest position error where an error is securely detected  error detection band: (parameter 606 -0.6°) up to parameter 606 Error Diagnostic Meaning for the LMV37.4 code code Position error fuel actuator...
Page 123: Changing The Error Detection Band For Monitoring The Actuator Positions
11.6 Changing the error detection band for monitoring the actuator positions The error detection band can be changed via parameter 606. A change is to be made only when using SQN13.17 or SQN14.17 actuators which, due to their mechanical design, require greater tolerances. For these types of actuators, set parameter 606 to 2.2°.
Page 124: Protection Against Actuator Mixup
11.9 Protection against actuator mixup Mixup of actuators can be detected through appropriate mounting (using different reference marks for the air and fuel actuator: Open/Close/0°/90°). With at least one of the actuators, the reference mark not used must be blocked by a mechanical stop. Now, if the actuator connections with the LMV37.4 have been interchanged, one of the actuators cannot reach the reference mark, which is detected by the LMV37.4.
Page 125: Fan Control
12 Fan control 12.1 Function principle Optionally, the LMV37.4 can be operated with a VSD or PWM fan. … The activation takes place via a DC 0 10 V or alternatively via a PWM interface. For control of the fan’s speed, a safety-related speed feedback signal is required. With pneumatic fuel-air ratio control, the speed feedback signal is not evaluated as standard.
Page 126: Vsd Control X74 Pin 3
To enable the VSD to bring the fan motor’s speed to the correct no-load speed, the motor contactor’s drop out delay time must be about 25 seconds. Example: Siemens Micromaster 440 +24 V Setpoint 0...10 V Figure 82: Connection of VSD to the LMV37.4 It is possible to set the VSD control to 0 via the analog output when the safety loop is open (including burner flange switch).
Page 127: Safe Separation Of Mains Voltage And Protective Extra Low-Voltage
12.5 Safe separation of mains voltage and protective extra low-voltage Caution! All inputs and outputs of PWM fan control are designed for use with protective extra low-voltage. For this reason, strict separation from the mains voltage side must be ensured! This necessitates an external power supply by the VSD or an external power pack (X74 pin 1, X74 pin 2).
Page 128: Acquisition Of Speed
12.7 Acquisition of speed 12.7.1 Acquisition of speed with proximity switch The actual speed is acquired by an inductive proximity switch which scans a metal sensor disk. The sensor disk must be attached directly to the motor’s drive shaft. Speed acquisition is safety-related.
Page 129: Acquisition Of Speed With Hall Generator
Speed sensor Figure 85: Speed sensor Selection of fan motor Motor supplier: Selection of a motor with threaded hole M8 x 15 at the end of the fan motor’s drive shaft. Standard motor and machining (drilling hole and cutting thread M8 x 15). 12.7.2 Acquisition of speed with Hall generator If the speed is acquired via a Hall generator, the requirements for safety-related applications are the same as those for the speed feedback signal via sensor disk.
Page 130: Forced Travel Fan
12.7.3 Forced travel fan When a symmetrical speed signal is used, like with the actuators, a forced travel is also carried out for the fan to detect an error in the speed feedback signal when a speed is maintained for a long period of time. The activation of the forced movement is started if the fan has not moved by more than the neutral zone of the speed supervision (parameter 662) for longer than 50 minutes.
Page 131: Speed Supervision
12.9 Speed supervision The fan’s current speed is acquired by the LMV37.4 and assessed from a safety point of view. If the fan does not operate at the speed setpoint, speed control makes a corrective action, trying to reach the setpoint. If it is not reached within a certain period of time, safety shutdown is initiated.
Page 132: Extended Speed Supervision
12.9.1 Extended speed supervision Additional supervision limits can be activated via the OEM level for different operating states. A check is only carried out to determine whether the value was exceeded or fallen short of here. A shutdown takes place after the Maximum time outside close range (parameter 665, default setting 3 s) has elapsed.
Page 133: Setting The Parameters Of Vsd
Error Diagnostic Meaning for the LMV37.4 code code Bit 0 Lower control range limitation Valency 1 Bit 1 Upper control range limitation Valency 2...3 Bit 2 Interrupt shutdown due to electromagnetic interference Valency 4...7 Bit 3 Curve too steep in terms of ramp speed Valency 8 Bit 4 Interruption of speed signal...
Page 134: Standardization Of Speed
12.11 Standardization of speed Since the different types of fans operate at different speeds and signal handling should be as straightforward as possible, all speeds in the LMV37.4 are standardized between 0% and 100%. For this reason, the VSD module uses a parameter which contains the Standard speed (100% speed).
Page 135 Automatic speed To facilitate determination of the standardized speed, the LMV37.4 features automatic standardization speed standardization. The speed must be standardized while in standby mode. Speed standardization is integrated in the setting process for electronic fuel-air ratio control, but can also be started later from the parameter setting level. When using a release contact for the VSD (external relay at fan output X3-05 pin 1), the fan output is controlled during speed standardization.
Page 136 Close the standardization When standardization is successfully completed, reset parameter 641 to 0. If standardization was not successful, parameter 641 assumes a negative value. Parameter Control of VSD’s speed standardization Error diagnostics of negative values (refer to error 82) 0 = no speed standardization 1 = speed standardization active The value provides information on the cause of fault: Value...
Page 137 Value Error Remedy  Motor turns too slowly or too fast The speeds between µC1 and µC2 deviated too much. Speed deviation µC1 + µC2 This can be caused by wrong standardized speeds (e.g. after restoring a data set to a new LMV37.4) →...
Page 138: Control Of Fan Motor With Pneumatic Fuel-Air Ratio Control
12.13 EMC of LMV37.4 and VSD The function and EMC tests with the LMV37.4 have been successfully conducted in connection with the following makes and types of VSDs: Siemens: SED2-0.37 / 22 X Danfoss: VT2807 During operation, VSDs generate electromagnetic interference on the mains network.
Page 139: Characteristics Pwm Fan
12.14.1 Characteristics PWM fan The LMV37.4 works with a standardized speed signal, with linear interpolation between standstill and the standardized speed (nominal speed). The requirement for this assumption is a linear fan characteristic, which is achieved solely by self-regulated PWM fans. ...
Page 140: Acquisition Of Speed Pwm Fan
12.14.2 Acquisition of speed PWM fan Due to design-related restrictions, it is usually not possible to mount a sensor disk for generating an independent, asymmetrical (direction of rotation sensitive) speed signal on a PWM fan. Instead, the symmetrical speed signal of the PWM fan based on the Hall effect is used.
Page 141: Trim Function
12.15 Trim function The trim function enables the specified speed of the fuel-air ratio control curve to be … changed in adjustable limits via 4 20 mA input. The residual oxygen content of the flue gas or the supply air temperature can be used for determining the current setting. Depending on the setting, the trimming can be activated from ignition or only in operation, between low-fire and high-fire, after an adjustable wait time has elapsed.
Page 142: Settings And Mode Of Operation
12.15.1 Settings and mode of operation … The maximum trimming range of -15 +25% cannot be changed and is intrinsically linked to the 4...20 mA specification of the analogue input (40% trimming range based on 16 mA  1% trim per 0.4 mA). ...
Page 143: Optional Internal Checks
Parameter Behavior if analog input is invalid (4…20 mA) 0 = deactivate default output low-fire / trim function (with warning message) 1 = safety shutdown + startup prevention 2 = deactivate default output low-fire / trim function (without warning message) Activation trim function 0 = inactive 1 = active...
Page 144 Plausibility check for range limitation A plausibility check can be activated to show if the LMV37.4 remains on a range limit of the trim function for a defined time (time setting = 0 deactivates the check / warning / shutdown). This can be used to identify an incorrect setting in the trim function.
Page 145: External Tests (Optional)
12.15.3 External tests (optional) In addition to the LMV37.4 internal tests, various states may also be monitored by an external PLC or control. Selected process parameters, e.g. the current phase, can be read out via Modbus for this purpose. In this case, the LMV37.4 is shut down via a self- locking NC contact of the PLC in the safety loop (X3-04 pin 1 and pin 2) or in series with the load controller ON signal (X5-03 pin 1 and pin 4).
Page 146 Trim range test via PLC Once the curve setting or commissioning is complete, a trim range test must be carried out to check the influence on the application. The test is initiated by the PLC, which provides both the output specification (via Modbus) and the trim specification (via 4...20 mA).
Page 147: Description Of Connection Terminals
12.16 Description of connection terminals 12.16.1 LMV... Power supply for speed sensor Speed input VSD control 24V EXT Bild 335e/0409 Figure 89: VSD module X74 12.16.2 PWM fan LMV... 24V EXT Bild 336/0309 Figure 90: PWM fan X74 LMV... Power supply for sensor Speed feedback / Hall signal PWM speed output Controller input 4...20 mA...
Page 148: Load Output X74 Pin 3
13 Load output X74 pin 3 The load output is only available as an alternative to VSD control. If the VSD is deactivated, the output for the VSD delivers the current burner output. The analog output is a voltage output and – using parameter 645 – can be switched between DC 0…10 V, DC 2…10 V and DC 0/2…10 V.
Page 149: Modulating Operation
13.2 Modulating operation Actual value Voltage Curvepoint Display / output value DC 0 V Ignition load DC 1 V Low-fire DC 2 V High-fire DC 10 V 100% The values between low-fire and high-fire are interpolated in a linear manner. 13.3 2-stage operation Actual value Voltage...
Page 150: Fuel Meter Input X75 Pin 1 / X75 Pin 2
14 Fuel meter input X75 pin 1 / X75 pin 2 A fuel meter can be connected to acquire the amount of fuel burnt. The fuel meter function is only available as an alternative to VSD control. If the VSD is deactivated, a fuel meter can be connected to terminals X75 pin 1 and X75 pin 2.
Page 151: Fuel Throughput
14.2 Fuel throughput With the fuel meter connected, the LMV37.4 calculates continuously the current fuel throughput. The time required for calculating the fuel throughput varies and lies between 1 and 10 seconds. If the fuel meter delivers no pulses for more than 10 seconds, the display shows 0 fuel throughput.
Page 152: Connection And Internal Diagram
15 Connection and internal diagram 7546a14e/0718 Shielding: For shielding the cables on the VSD, refer to:  Siemens SED2 VSD Commissioning Manual (G5192), chapters 4 and 7, or  Danfoss Operation Manual VLT 6000 (MG60A703), chapter Installation VSD X74 COM X92...
Page 153: Special Feature: Burner Identification
16 Special feature: Burner identification The OEM must assign an individual burner identification to every burner. This ensures that during backup/restore, incompatible parameter sets cannot be copied between different burners (also refer to the documentation on the PC software ACS410 under Backup/Restore and in this documentation in chapter Backup / Restore).
Page 154 Parameter Operating mode building automation 0 = off 1 = Modbus 2 = reserved Setback time in the event of communication breakdown Setting value: 0 = deactivated 1…7200 s Predefined output in the event of communication breakdown with building automation Setting values: For modulating operation, the setting range is as follows: 0…19.9 = burner off...
Page 155: Modbus
17.2 Modbus With this type of bus protocol, the LMV37.4 operates as a slave on the Modbus and the transmission mode used is RTU (Remote Terminal Unit). For more detailed information, refer to the Modbus User Documentation (A7541). Parameter Device address for Modbus of LMV37.4 Setting values 1…247 Baud rate for Modbus...
Page 156: Pc Software Acs410
18 PC software ACS410 The ACS410 PC software serves primarily as an operating module for the LMV37.4, providing the following basic functions:  Visualization of system state via the following data: - Parameters - Process data  Configuration and parameterization of the LMV37.4 (individual parameters) ...
Page 157: Error History
19 Error history The LMV37.4 provides an error history in which the last 25 errors are stored. The first entry represents the current error state and can also be «error-free», refer to Error code list. Error Diagnostic Meaning for the LMV37.4 code code 200 OFF...
Page 158: Makeup Of Error History
19.2 Makeup of error history Parameter Index Description Current error state, can also be error-free Error code (200 = error-free)  refer to Error code list Diagnostic code  refer to Error code list Error class  error classes Phase: Phase in which error occurred  sequence diagrams Startup counter: (parameter 166) at which the error occurred Output: Burner output at which the error occurred .01..06...
Page 159: Safety Notes On Use Of The Azl2
21 Safety notes on use of the AZL2 Caution! To prevent the risk of fire and explosions, damage to heating plant or damage resulting from improper use of the products, ensure that the following safety notes are observed: The burner management system covered by the present Basic Documentation may only be used as specified and only in connection with the appropriate burner and heating plant.
Page 160: Operating Via Azl2
Operating via AZL2 22.1 Description of unit/display and buttons Function and operation of unit versions AZL21 and AZL23 are identical. /reset h min s Figure 98: Description of unit/display and buttons Button Function Button F For adjusting the fuel actuator (keep depressed and adjust the value by pressing Button A...
Page 161: Meaning Of Symbols On The Display
22.2 Meaning of symbols on the display Fault status message Flame present Valve controlled Ignition controlled Fan motor controlled Oil preheater on Heat request from controllers Parameter setting mode Info mode Service mode Actuator closing Actuator opening Unit of current display Figure 99: Meaning of display 22.3 Brightness of display...
Page 162: Manual Control (Manual Request For Output)
22.4.2 Manual control (manual request for output) Burner is in operation. The display shows oP: on the left, the percentage of the current output on the right. h min s Example: oP: 20.0 Press for 1 s. The display shows LoAd:, the current output flashes.
Page 163: Backup / Restore
22.6 Backup / restore Using the AZL2, the settings made on the LMV37.4 can be stored (backup) and then transferred back to the LMV37.4 at a later point in time. Creating a backup data set Parameter 050.0 Index 0: Creation of backup The following parameters can be used to read information about the backup data set: Parameter Burner identification of the AZL2 backup data set...
Page 164: Backup
22.6.1 Backup Parameter 000: flashes. Display: Parameter 000: flashes, Int does not. /reset Press to select parameter 050 Display: Parameter 050. flashes, index 00: and value 0 do not. /reset Press to select parameter bAC_UP /reset Display: Parameter bAC_UP /reset Press to select the backup process.
Page 165 After about 5 seconds (depending on the duration of the program), 0 appears on the display, indicating the end Approx. of the backup process. Display: 0  Note If an error occurs during the backup process, a negative value is displayed. For error diagnostics, the cause of the error can be determined from the diagnostic code of error message 137 (see Error code list).
Page 166: Restore
22.6.2 Restore Parameter 000: flashes. Display: Parameter 000: flashes, Int does not. /reset Press to select parameter 050 Display: Parameter 050. flashes, index 00: and value 0 do not. /reset Press to go to parameter bAC_UP. /reset Display: Parameter bAC_UP Press to go to the rEStorE function.
Page 167 Press to activate the restore process. /reset /reset Display: 1 appears After about 8 seconds (depending on the duration of the program), 0 appears on the display, indicating the end of the backup process. Display: 0  Note  Before restoring the backup data on the LMV37.4, the latter compares the burner identification and product no.
Page 168: Operation Of Lmv37.4 Via The Azl2
Operation of LMV37.4 via the AZL2 23.1 Normal display Normal display is the standard display in normal operation, representing the highest menu level. From the normal display, you can change to the info, service or parameter level. 23.1.1 Display in standby mode LMV37.4 is in standby mode.
Page 169: List Of Phase Displays
23.1.2.3. List of phase displays Phase Function Ph00 Lockout phase Ph01 Safety phase Ph10 Home run Ph12 Standby (stationary) Ph22 Fan ramp up time (fan motor = ON, safety valve = ON) Ph24 Traveling to the prepurge position Ph30 Prepurge time Ph35 Run the fan to ignition speed Ph36...
Page 170: Display Of Operating Position
23.1.3 Display of operating position Display oP stands for Operating position reached. Modulating mode: Current output in % h min s Display oP: P0 stands for Ignition point. Multistage operating mode: Current heating stage h min s Display oP: P1 stands for Stage 1. Multistage operating mode: Current heating stage h min s Display oP: P2 stands for Stage 2.
Page 171: Fault Status Messages, Display Of Errors And Info
23.1.4 Fault status messages, display of errors and info 23.1.4.1. Display of errors (faults) with lockout The display shows Loc:, the bar under the fault status message appears. The LMV37.4 is in the lockout position. h min s The display shows current error code c: alternating with diagnostic code d: (refer to Flash code list).
Page 172: Error With Safety Shutdown
23.1.4.4. Error with safety shutdown The display shows Err:. The LMV37.4 initiates safety shutdown. h min s The display shows current error code c: alternating with diagnostic code d:. Press to return to the normal display. /reset h min s Example: Error code 12 / diagnostic code 0 23.1.4.5.
Page 173: Menu-Driven Operation
Menu-driven operation 24.1 Assignment of levels The various levels can be accessed via different button combinations. The parameter level can only be accessed via password. Normal display >1 s /reset Change to normal display >3 s <8 s Info level /reset >3 s <8 s...
Page 174: Info Level
25 Info level 25.1 Display of info level Press until InFo appears. /reset /reset 1…3 s When releasing , you are on the info level. /reset The info level displays information about the LMV37.4 and about operation in general.  Note On the info level, you can press to display the next or the previous parameter.
Page 175: Display Of Info Values (Examples)
25.2 Display of info values (examples) 25.2.1 Identification date The identification date described below corresponds to the creation date for the program sequence and cannot be changed by the user. The display shows parameter 102: flashing on the left, characters ._._ on the right. Example: 102: ._._ h min s …...
Page 176: Burner Identification
25.2.3 Burner identification The display shows parameter 113: flashing on the left, characters ._._ on the right. Example: 113: ._._ h min s Press for 1…3 s to show the burner’s /reset identification. /reset Default setting: - - - - - - - - 1…3 s h min s Example: 3...
Page 177: Number Of Startups Resettable
25.2.4 Number of startups resettable  Note! Can be deleted for service refer to chapter Parameter list! The display shows parameter 164: flashing on the left, characters ._._ on the right, since display of the number of startups may comprise more than 5 digits.
Page 178: Total Number Of Startups
25.2.5 Total number of startups The display shows parameter 166: flashing on the left, characters ._._ on the right, since the display of the total number of startups may comprise more than 5 digits. h min s Example: Parameter 166: ._._ …...
Page 179: Service Level
Service level The service level is used to display information about errors including the error history and information about the LMV37.4.  Note When on the service level, you can press to display the next or the previous parameter. Instead of pressing , you can also press for <1 s.
Page 180: Display Of Service Values (Example)
26.2 Display of service values (example) 26.2.1 Number of faults The display shows parameter 161: flashing on the left, the number of faults that occurred thus far on the right 0. Example: Parameter 161: 0 h min s Back to the previous To the next parameter parameter /reset...
Page 181: End Of Service Level
26.2.4 End of service level When this display appears, you have reached the end of the service level. Display – End – appears flashing. h min s To the start of the service To the end of the service level level Press to return to the normal display.
Page 182: Parameter Level
The change to the parameter level requires a password. Siemens supplies the LMV37.4 with the factory settings according to Type summary. The OEM can change the Siemens default settings to match his own requirements. With the LMV37.4, the LMV37.4’s characteristics are determined primarily through parameter settings.
Page 183: Entry Of Password
27.1 Entry of password  Note The OEM’s password must consist of 5 characters, the heating engineer’s of 4 characters. Press button combination to display CodE. h min s When releasing the buttons, 7 bars appear the first of which flashes. Press to select a number or letter.
Page 184 As a confirmation of correct entry, PArA appears for a maximum of 2 seconds. h min s  Note For entry of passwords or burner IDs, the following numbers and letters can be used: 184/267 Building Technologies Basic documentation LMV37.4... CC1P7546en 27 Parameter level 17.12.2018...
Page 185: Entry Of Burner Identification
27.2 Entry of burner identification The burner’s identification is entered like a password (character by character), but from right to left and ending with «_». Parameter 113: flashes. Press to go to editing mode. h min s /reset /reset You are on the display for undefined burner identification.
Page 186 The display no longer flashes. Example: Burner identification 9993 h min s Press to return to the parameter level. PArAmeter 113: for burner identification. h min s 186/267 Building Technologies Basic documentation LMV37.4... CC1P7546en 27 Parameter level 17.12.2018...
Page 187: Change Of Heating Engineer's Password
27.3 Change of heating engineer’s password  Note! ’ For the OEM to change the heating engineer s password, c: requires entry of the OEM password! Press button combination to display 000: Int. >1 s Pressing the button takes you to parameter /reset 041 heating engineer's password.
Page 188: Change Of Oem's Password
27.4 Change of OEM’s password Parameter 042: flashes. Press to go to level c: for password changes. /reset Letter n: for new appears flashing. Proceed as described in chapter Entry of password and enter the new password (5 characters). After entry of the last character, the password must be /reset confirmed by pressing /reset...
Page 189: Structure Of Parameter Levels
27.6 Structure of parameter levels The parameters are assigned to different levels. /reset Internal parameter (password level) Entering the password /reset /reset Basic unit /reset Basic unit Fuel-air ratio curves (primary setting) /reset Bild 384e/1209 /reset Fuel air ratio /reset Actuators /reset Error history...
Page 190: Parameters Without Index, With Direct Display
27.7 Parameters without index, with direct display 27.7.1 Using the example of parameter 208: Program stop PArAmeter level 200: for LMV37.4. Press to go to menu /reset level 200: /reset Press to select Program stop. Display: Parameter 208: flashes, value 0 does not.
Page 191   Adopt the value! Discard the change! /reset h min s h min s Press to return to the parameter Press to return to editing mode. /reset level. The value set is adopted. Display: Parameter 208: flashes, value 0 does not.
Page 192: Parameters Without Index, With No Direct Display (With Parameters Having A Value Range >5 Digits)
27.8 Parameters without index, with no direct display (with parameters having a value range >5 digits) 27.8.1 Using the example of parameter 162: Operating hours resettable PArAmeter level 100: for general. h min s Press to go to menu /reset level 100:.
Page 193   Adopt the value! Discard the change! /reset h min s h min s Press to return to the parameter Press to return to editing mode. /reset level. The value set will be adopted. Display: Parameter 162: flashes, characters ._._ do not.
Page 194: Parameter With Index, With Direct Display
27.9 Parameter with index, with direct display 27.9.1 Using the example of parameter 501: No-flame positions fuel actuator PArAmeter level 500: for fuel-air ratio control. h min s /reset Press to go to menu level 500:. /reset Display: Parameter 501. flashes, index 00: h min s and value 0.0 do not.
Page 195   Adopt the value! Discard the change! /reset h min s h min s Press to return to the index. Press to return to editing mode. /reset Display: Parameter 501. does not flash, The value set will be adopted. index 01: flashes, value 0.0 has not changed and does not flash.
Page 196: Parameters With Index, With No Direct Display
27.10 Parameters with index, with no direct display 27.10.1 Using the example of parameter 701: Errors Refer to chapter Error code list!  Note Can be deleted for service, refer to chapter Parameter list! HIStory 700: for error history. h min s Press to go to the /reset...
Page 197 /reset Press to go to display mode. /reset Display: Value 56 h min s Press to return to the index. Display: Parameter 701. does not flash, index 05: flashes, characters ._._ do not. h min s Press to return to the parameter level. Display: Parameter 701.
Page 198 Back to the previous To the next parameter parameter /reset <1 s When this display appears, you have reached the end of the error history. Display – End – appears flashing. h min s Press to return to the parameter level. HISt 700: for error history h min s Back to the previous...
Page 199: Fuel-Air Ratio Curves - Settings And Commissioning
27.11 Fuel-air ratio curves – settings and commissioning The display shows 400: flashing on the left, SEt appears on the right. h min s 27.11.1 Initial commissioning An unprogrammed LMV37.4 or a LMV37.4 whose operating mode has been reset or changed displays OFF UPr.
Page 200  Note Ensure that the fuel train is correctly set in compliance with the type of burner used. Parameter Actuator controlled Fuel ● ● Burner operating mode (fuel train, modulating / multistage, actuators, etc.) ● ● -- = undefined (delete curves) ●...
Page 201 Press to go to editing mode. /reset /reset h min s Press to select the required setting. Example: 3 for gas modulating with pilot valve h min s (Gp2 mod) Press to save the selected setting. /reset /reset h min s Press to return to the parameter level.
Page 202: Setting Curvepoints P0 And P9 For Modulating Operation ("G Mod", "Gp1 Mod", "Gp2 Mod" And "Lo Mod")
27.11.2 Setting curvepoints P0 and P9 for modulating operation («G mod», «Gp1 mod», «Gp2 mod» and «Lo mod»)  Note Not all actuators used in the following example can be set, depending on the selected operating mode. Example of «G mod» Display P0 appears blinking.
Page 203: Setting Curvepoints P0 And P9 For "G Mod Pneu", "Gp1 Mod Pneu" And "Gp2 Mod Pneu
Press simultaneously to adjust speed n0 of the VSD. Example: 20.0 s min % Release The selected value is adopted. Example: 20.0 s min % To the next curvepoint Press P9 appears blinking. Curvepoint for high-fire. h min s Same procedure as with P0 Note! ...
Page 204: Warm Settings For Modulating Operation ("G Mod", "Gp1 Mod", "Gp2 Mod" And "Lo Mod")
27.11.4 Warm settings for modulating operation («G mod», «Gp1 mod», «Gp2 mod» and «Lo mod»)  Note With the warm settings, the burner is started up after pressing the Info button. Fuel-air ratio control can now be accurately set while the flame is present. When traveling along the precalculated curve to high-fire point P9, all intermediate curvepoints (P2…P8) must be set.
Page 205 Phase Traveling to ignition position h min s Wait until the burner is operating and symbol ▲ or ▼ is no longer highlighted! The startup sequence stops in phase 36 Traveling to ignition position. The ignition point can be adjusted under cold conditions. Ignition position P0 can only be set after symbol ▲...
Page 206 Starting the warm settings Ignition position P0 can only be set when symbol ▲ or ▼ is no longer highlighted. For fuel, keep depressed, for air , as well as for VSD as well as Press to adjust the value. h min s When symbol ▲...
Page 207 Figure 104: Setting the curvepoints  Note Curvepoints P2 to P8 are automatically computed as a straight line between P1 and Example 1 = gas modulating P0, P1 and P9 are set as described: Curvepoint Value 1 Value 2 fuel 30.0 22.0 32.0...
Page 208 Continue the same way with P2 through P9! High-fire position P9 can only be set when symbol ▲ or ▼ is no longer highlighted. If required, readjust the gas pressure. For fuel, keep depressed, for air , as well as for VSD as well as Press to adjust the value.
Page 209: Warm Settings For Modulating Mode ("G Mod Pneu", "Gp1 Mod Pneu" And "Gp2 Mod Pneu")
When symbol ▼ or ▲ is no longer highlighted, you can press ESC a second time. h min s h min s The warm settings for fuel-air ratio control by the LMV37.4 are now completed. 27.11.5 Warm settings for modulating mode («G mod pneu», «Gp1 mod pneu» and «Gp2 mod pneu») Note ...
Page 210: Cold Settings For "G Mod Pneu", "Gp1 Mod Pneu" And "Gp2 Mod Pneu
27.11.7 Cold settings for «G mod pneu», «Gp1 mod pneu» and «Gp2 mod pneu» Note Refer to chapter Warm settings for modulating mode («G mod», «Gp1 mod», «Gp2 mod»  and «Lo mod»)! With no flame, however, no actuator travel and no automatic operation after the settings have been made.
Page 211: Editing The Curvepoints
27.11.8 Editing the curvepoints  Note Changing a curvepoint in the cold position requires a new approach to all curvepoints in the warm position to verify the change on the burner itself. After changing the curvepoint, the normal display of the AZL2 shows OFF UPr. To the next curvepoint to select the curvepoint The selected curvepoint is displayed.
Page 212: Interpolating The Curvepoints
27.11.9 Interpolating the curvepoints /reset Identification of start for setting the curve parameters. h min s Example 1 = gas modulating P0, P1 and P9 are set as described: Curvepoint Value 1 Value 2 fuel 30.0 22.0 32.0 24.0 80.0 90.0 P2 through P8 have automatically been Curvepoint...
Page 213 Press to change the value as required. Example: 00.0 s min % Release The required value is adopted. h min s Example: P5:50.0:46.0 Keep depressed for >3 s. >3 s CALC appears. h min s The display jumps to P6. h min s All curvepoints from P5 to P9 have now been Curvepoint...
Page 214 >3 s >3 s h min s If it is not only the current curvepoint that shall be changed, but all other points in the direction of travel as well, a new straight line from the current point to P9 (press ) or P1 (press ) can be calculated by a long push on...
Page 215: Setting Of Curvepoints For Multistage Mode ("Lo 2-Stage" And "Lo 3-Stage")215
27.11.10 Setting of curvepoints for multistage mode («Lo 2-stage» and «Lo 3- stage») Example of «Lo 2-stage» P0 appears blinking. Curvepoint for ignition load. h min s Keep depressed. You are now at P0 of air actuator A. h min s Press simultaneously adjust ignition position P0 of the air actuator.
Page 216: Warm Settings For "Lo 2-Stage" And "Lo 3-Stage
27.11.11 Warm settings for «Lo 2-stage» and «Lo 3-stage» Identification of start for setting the curve parameters. h min s Provided the load controller is enabled! /reset Phase Standby (stationary) h min s Phase Fan ramp up (fan motor = ON, safety valve = ON) h min s Phase Traveling to prepurge position...
Page 217 Phase Traveling to ignition position h min s Phase Preignition h min s Phase 1st safety time (ignition transformer ON) h min s Phase Interval 1 min s Ignition position P0 can be set only when symbol ▲ or ▼ is no longer highlighted. Keep depressed and, for VSD as well as...
Page 218 Low-fire position P1 can be set only when symbol ▲ or ▼ is no longer highlighted. Set stage 1 P1. Fuel valve V1 is switched on. Keep depressed and, for VSD as well as Press to adjust the value. h min s When symbol ▲...
Page 219 Back to the previous To the next curvepoint curvepoint Curvepoint P2 can only be adjusted when symbol ▲ or ▼ is no longer highlighted. Fuel valve V2 is switched on. Keep depressed and, for VSD as well as Press to adjust the value. h min s When symbol ▲...
Page 220: Cold Settings For Multistage Mode ("Lo 2-Stage" And "Lo 3-Stage")
h min s The warm settings for fuel-air ratio control of the LMV37.4 have now been configured. 27.11.12 Cold settings for multistage mode («Lo 2-stage» and «Lo 3-stage») Note  Refer to chapters Warm settings for «Lo 2-stage» and «Lo 3-stage»! But with no flame, no actuator travel and no automatic operation after the settings have been made.
Page 221: Intensity Of Flame During Curve Settings
27.11.13 Intensity of flame during curve settings When setting the curve and the curvepoint is displayed, you can press to show the /reset intensity of flame. When pressing the button for >1 s, a change to parameter 954 is made; when releasing the button, you return to the curvepoint. Example: Curvepoint Low-flame position P1.
Page 222: Parameter List Lmv37.4
28 Parameter list LMV37.4 Abbreviations for password level: Building automation Heating engineer HF (GA) Heating engineer (building automation) Info / service Manufacturer of the individual product Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max.
Page 223 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Manual output Output edit/clear 100% 0,1% Undefined Undefined = automatic mode Minimum output positioning step Output edit 100% 0,1% Index Wert Index 0 = output building automation Index 1 = output external load controller analog Index 2 = Power of external load controller contacts Loss of flame test (TÜV test) starting (parameterized...
Page 224 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read 1…7200 s Reserved Std_u8 edit Reserved Std_u16 edit 10 s 60 s 30 s Device address for Modbus of LMV37.4 Std_u8 edit Setting value: 1…247 Setting of Baud rate for Modbus communication...
Page 225 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Index 0 = QRB / QRC (0 = deactivated, >1 = LMV37.420Ax: 30 activated) Index 1 = ION / QRA (0 = deactivated, >3 = activated) (only 200 ms-steps) Postpurging in lockout position Selection...
Page 226 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Flame signal sensitivity setting ionization probe / QRA Std_u8 edit in operation (  phase 60) 0 = standard 1 = sensitivity approx. twice as high Maximum output for high flame sensitivity Std_u8 edit...
Page 227 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read 22 = Lo mod oil actuator only 23 = Ho mod separate circulation control 24 = Ho 2-stage separate circulation control 25 = Ho mod. without circulation control 26 = Ho 2-stage without circulation control 27 = Ho 3-stage without circulation control 28 = G mod mech air actuator only...
Page 228 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Maximum waiting time for detection of detector or Time edit 10 min 0,2 s 30 s pressure switch signal (e.g. home run, preignition) Gas: Active detector flame evaluation Selection edit...
Page 229 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read fuel valve V1 and fuel valve V2) 3 = pressure switch-min after fuel valve V2 Gas: Input pressure switch-max / POC Selection edit LMV37.400Ax: 1 1 = pressure switch-max...
Page 230 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Oil: Prepurging Selection edit 0 = inactive 1 = active Oil: Prepurge time Time edit LMV37.400Ax: 15 s 60 min 0,2 s LMV37.400Ax: 15 s LMV37.420Ax: 5 s LMV37.420Ax: 30 s...
Page 231 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read This means that no separate setting is possible for oil / gas or fuel 0 / fuel 1. Oil: Point in time oil is ignited Selection edit LMV37.400Ax: 1...
Page 232 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read postpurge speed) 0 = inactive 1 = active 2 = active (50% tolerance increase outside operation) Activation trim function Std_u8 edit 0 = inactive 1 = active 2 = active (including test function for analog input) 3 = active (including ignition speed)
Page 233 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read 0 = CLOSED (<0°) 1 = OPEN (>90°) Actuator's direction of rotation Selection edit Index Wert Index 0 = fuel Index 1 = air Setting values: 0 = counterclockwise 1 = clockwise (exclusively for SQM3)
Page 234 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read 1 = speed standardization active Standardized speed Std_u16 read only 14000 Undefined Index 0 = speed 1 Index 1 = speed 2 (internal monitoring) Fuel 1: Index 2 = speed 3 Index 3 = speed 4 (internal monitoring)
Page 235 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Maximum ignition speed Std_s16 edit / clear 0,1% undefined Minimum / maximum speed limitation in operation Std_s16 edit / clear 100% 0,1% undefined Index 0 = minimum speed...
Page 236 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read Standardized speed Std_s16 -200% 200% 0,1% read only Active load controller source Selection read only 1 = output during curve settings 2 = manual output 3 = default output via building automation 4 = default output via analog input 5 = external load controller via contacts...
Page 237 Par. Parameter Number of Type Edit Value range Increment Default Password level elements Min. Max. setting write read ACS410 Error memory: Code Std_u8 read only For query ACS410 Error memory: Diagnostic code Std_u8 read only For query ACS410 Error flags Hex_32 resettable 0xFFFFFFFF...
Page 238: Error Code List (All Lmv2 Types / Lmv3 Types)
29 Error code list (all LMV2 types / LMV3 types) Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code no Comm No communication between LMV37.4 and AZL2 Check wiring for line interruption/loose contact No flame at the end of first safety time No flame at the end of first safety time No flame at the end of second safety time ...
Page 239 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Diagnostics corresponds to the period of time from shutdown of fuel valves to the detection of loss 3...255 Loss of flame due to TÜV test (loss-of-flame test) of flame (increment 0.2 s  Value 5 = 1 s) Valve proving For valve proving via X5-01 (gas pressure switch-min) ...
Page 240 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Pressure switch-min Check wiring for line interruption No minimum gas / oil pressure Check wiring for line interruption Gas shortage / prevention of startup Pressure switch-max / POC Check wiring to see if there is a line interruption.
Page 241 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Check wiring to see if there is an open-circuit (X5-01) No minimum gas pressure Check wiring to see if there is an open-circuit (X5-01) Gas shortage – start prevention Check wiring to see if there is an open-circuit (X9-04) Heavy oil direct start Check that the oil is preheated correctly...
Page 242 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Make a reset; if error occurs repeatedly, replace the LMV37.4 Internal error Internal error fuel-air ratio control: Position calculation modulating No valid output Output invalid Adjust the curvepoints for all actuators Curvepoints undefined Special position undefined Parameterize the home position for all actuators used...
Page 243 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code VSD speed was too high Control range limitation at the bottom VSD speed was too low Control range limitation at the top Too much electromagnetic interference on the sensor line Interrupt limitation speed input ...
Page 244 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code standardized speeds (e.g. after restoring a data set to a new LMV37.4) → repeat standardization and check the fuel-air ratio Standardization was made in a wrong phase. Permitted are only phases  12 Wrong phase of phase manager ...
Page 245 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code seconds) Modulating operating ramp 48 seconds Curve slope max. 10% for LMV37.4 ramp of 30 seconds (20% for 15 seconds or 30% for 10 seconds) Modulating operating ramp 64 seconds Curve slope max.
Page 246 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code (parameter 544). Valency 1 Modulating operating ramp 32 seconds Curve slope max. 10% for LMV37.4 ramp of 20 seconds (20% for 10 seconds or 40% for 5 seconds) Modulating operating ramp 48 seconds Curve slope max.
Page 247 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Check the setting of the actuator type (parameter 613.1) Check to see if actuators have been mixed up Check to see if actuator is locked or overloaded Parameterization of an actuator (e.g. the reference position) has been changed. Bit 7 Referencing error due to parameter change ...
Page 248 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Check to see if the torque is sufficient for the application. Internal error LMV37.4 Internal error LMV37.4 Error flame signal acquisition Short-circuit at QRB Check wiring. Short-circuit of sensor Flame detector possibly fault.
Page 249 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Internal error contact sampling 0 Pressure switch-min 1 Pressure switch-max / POC 2 Pressure switch valve proving / Fuel selection Fuel 0 / Reset 3 Air pressure switch 4 Fuel selection Fuel 1 / Load controller OPEN 5 Load controller ON/OFF...
Page 250 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code 1 Pressure switch-max / POC 2 Pressure switch valve proving / Fuel selection Fuel 0 / Reset 3 Air pressure switch 4 Fuel selection Fuel 1 / Load controller OPEN 5 Load controller ON/OFF 6 Fuel selection Fuel 0 / Load...
Page 251 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code Make a reset; if error occurs repeatedly, replace the LMV37.4 Internal error mains voltage supervision Internal error system counter Warning threshold has been reached. The LMV37.4 should be replaced Designed life time exceeded (250´000 startups) Life time exceeded Switch-off threshold has been reached...
Page 252 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code No backup stored in AZL2 240 (-16) Restore – no backup in AZL2 Backup has an unsuitable product no. (ASN) and must not be loaded on the LMV37.4 241 (-15) Restore –...
Page 253 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code The curvepoint of the VSD curve is below the permissible minimum value 1..9 Minimum value VSD curve fall below (diagnostic code = curvepoint number; e.g. 1 = P1) The curvepoint of the VSD curve is above the permissible maximum value 21..29 Maximum value VSD curve exceeded...
Page 254 Error Diagnostic code Meaning for the LMV37.4 Recommended measures or causes code No error 200 OFF LMV37.4 error-free Start prevention due to unparameterized LMV37.4 201 OFF UPr0 or Prevention of startup Go to error history, entry 702, for initial cause of the error with shutdown in connection with the first OFF UPr1 curve settings Bit 0...
Page 255: Revision History Of Lmv37.4
30 Revision history of LMV37.4 Software changes Software version V01.20  Optimizations regarding ACS410 (backup / restore)  Faster parameterization with AZL2 (3-stage)  Burner identification setting (entering the password)  Optimization: LMV37.4 hooks itself up in phase 38  Optimization: Cold setting via P0 (adoption P0 ...
Page 256 Software version V01.90  Scaling of analog input changed (no burner OFF function)  Optimization: Variable step width between ignition and low-fire (40% difference in speed, independent of ramp time; traveling time varies between 4 and 16 seconds with a 5-second to 20-second ramp) ...
Page 257 Software version V02.90  Optimization: Indication of errors on the parameter and info / service menu  Optimization: Rectification of eBus error telegrams, correction of manufacturer's code for safety temperature limiter, extension of service data query PB:03h SB:10h in order to read out / query the meter readings for the second fuel; the current fuel is output in query PB:05h SB:09h ...
Page 258 Automatic return travel of the SQN1 at the lower internal stop  Parameter on Siemens level Longer ignition off time during the first safety time (increased from 0.4 to 0.6 seconds) to prevent wrong error diagnostics in connection with QRA2 (C:7 in place of C:2) Software version V03.30...
Page 259 Software version V03.70  Optimization: No locking with C:75 via asynchronous load controller source  Extension: Support of PWM fans and symmetrical feedback  Extension: Increase in the maximum speed to 14000 rpm  Extension: Additional monitoring of the minimum prepurge speed, maximum ignition speed and minimum speed / maximum speed during operation ...
Page 260: List Of Figures
31 List of figures Figure 1: Note on mounting ..................11 Figure 2: Electrical connection ..................13 Figure 3: Connection interface OCI410 on the BC interface ......... 14 Figure 4: System structure .................... 20 Figure 5: Ionization input at AC 120 V / AC 230 V ............28 ...
Page 261 Figure 36: Message in the case of program stop ............65 Figure 37: Continuous fan ..................... 66 Figure 38: Application example of postpurging in the lockout position with fan but without VSD ......................68 Figure 39: Application example of postpurging in the lockout position with fan and VSD release contact .......................
Page 262 Figure 68: Program heavy oil direct ignition «Ho», «Ho mod without circulation control», «Ho 2-stage without circulation control», «Ho 3-stage without circulation control» 87 Figure 69: Modulating operation X5-03 ................. 94 Figure 70: 2-stage operation X5-03 ................95 ...
Page 263 Figure 105: Changing several curvepoints ..............214 263/267 Building Technologies Basic Documentation LMV37.4... CC1P7546en 17.12.2018...
Page 264 Index Index parameter, direct display A ..........194 Acquisition of speed Info / service mode....171 Fan forced travel ...... 130 Info level........174 Speed extended supervision .. 132 Info level end ......178 ACS410 .......... 156 Info value display ....175 Display / diagnostics ....
Page 265 X3-02 ........... 40 Error history makeup ....158 X3-03 pin 1 / 2 ......39 F X3-04 pin 1 / 2 ......38 Fan control........125 X5-01 ........... 43 Connection terminals ....147 X5-02 ........... 46 PWM fan ........147 X5-03 pin 1 .........
Page 266 Cross-sectional areas ....25 Reset .......... 58 Digital inputs ......38 Special functions ...... 58 Digital outputs......50 Start without prepurging ..63 Dimensions ........ 33 Startup........60 Error code list ......238 Switching back to pilot ..... 69 Flame detectors ......35 Time parameters .......
Page 267 ..........153 X75 pin 1 ........150 General information ....153 X75 pin 2 ........150 Modbus........155 Siemens AG Building Technologies © 2018 Siemens AG Building Technologies Berliner Ring 23 Subject to change! D-76437 Rastatt Tel. 0049-7222-598-279 Fax 0049-7222-598-269 www.siemens.com...

Siemens LMV37.4 Series Basic Documentation

1 Safety Notes

2 Makeup of Structure / Function Description

3 Type Summary

4 Technical Data

5 Dimensions

6 Display and Diagnostics

7 Basic Unit LMV37.4

8 Selection of Operating Mode

9 Connection to Load Controllers

10 Electronic Ratio Control

11 Actuators X53 / X54

12 Fan Control

13 Load Output X74 Pin 3

14 Fuel Meter Input X75 Pin 1 / X75 Pin 2

15 Connection and Internal Diagram

16 Special Feature: Burner Identification

17 Connection to Superposed Systems

18 PC Software ACS410

19 Error History

20 Lifecycle Function

21 Safety Notes on Use of the AZL2

22 Operating Via AZL2

23 Operation of LMV37.4 Via the AZL2

24 Menu-Driven Operation

25 Info Level

26 Service Level

27 Parameter Level

28 Parameter List LMV37.4

29 Error Code List (All LMV2 Types / LMV3 Types)

30 Revision History of LMV37.4

31 List of Figures

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Summary of Contents for Siemens LMV37.4 Series