Related Manuals for Honeywell STT25D
Summary of Contents for Honeywell STT25D
- Page 1 STT 3000 - Series STT250 Smart Temperature Transmitter Models STT25D, STT25H, STT25M Operator Manual Product of France Issue 6 - 02/00 EN1I-6190...
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Page 2: Table Of Contents
TABLE OF CONTENTS 1. OVERVIEW ......................1 1.1 I ....................1 NTRODUCTION 2. TECHNICAL SPECIFICATIONS ..............2 2.1 E ................2 NVIRONMENTAL ONDITIONS 2.1.1 Physical Specifications.................2 3. THEORY OF OPERATION................3 3.1 B ...................3 ASIC PERATION 3.2 C ..................4 ONFIGURATION OOLS 3.2.1 Smart Field Communicator (SFC) ............4 3.2.2 HART Communicator (model 275) .............4 3.2.3 Smartline Configuration Toolkit (SCT) ..........5 4. - Page 3 6.3.2 Transmitter Operating in 4 Byte Digital Output or in 4-20 mA Analog Mode ....................28 6.3.3 Transmitter Operating in 4-20 mA Analog Output Mode....28 6.4 D ............29 IAGNOSTIC AND ROUBLESHOOTING 6.4.1 Analog Meter ..................29 6.4.2 Smart Meter..................29 6.4.3 4-20 mA Analog Mode Calibration of Smart Meter .....
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Page 4: Overview
Honeywell Smart Field Communicator (SFC) or the PC based Smartline Configuration Toolkit (SCT). Model STT25D provides both the 4-20mA analog output as in Model STT25M or the digital DE protocol for digital integration to the Honeywell control system or other compatible interfaces. -
Page 5: Technical Specifications
2. TECHNICAL SPECIFICATIONS Environmental Conditions Reference Rated Operating limits Storage conditions Temperature 23°C 73°F -40°C to 85°C -40°C to 85°C -50°C to 100°C -40°F to 185°F -40°F to 185°F -58°F to 212°F Humidity 10 to 55 5 to 95 5 to 100 5 to 100 (%RH) Supply... -
Page 6: Theory Of Operation
The output of the STT250 can be 4-20mA analog (DE or HART) or digital DE protocol. The digital DE output is used primarily with Honeywell’s control system where it improves performance by avoiding conversion to/from an analog signal and offers full... -
Page 7: Configuration Tools
Configuration Tools 3.2.1 Smart Field Communicator (SFC) As previously indicated, the SFC communicates by connecting across the 4-20 mA wiring. DE Communication is by 16 mA pulses which disturb the 4-20 mA output signal. When in analog mode, ensure that receiving instruments are not on automatic control. -
Page 8: Smartline Configuration Toolkit (Sct)
• The STT25M cannot be changed from analog to digital DE mode. To access to the new functionalities of the STT25M and STT25D, you need a SCT3000 Version 154 or greater. The procedure below outlines the steps to set the three new configuration options. - Page 9 INDEX DATA TYPE VALUE To set the Input Latching to LATCHED UInt8 To set the Input Latching to NOT UInt8 LATCHED To turn on the NAMUR configuration UInt8 To turn off the NAMUR configuration UInt8 To enable Write Protection UInt8 To disable Write Protection String XXXX...
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Page 10: Bench Check Installation/Commissioning
ü a nominal 24 Vdc power supply with less than 100 mV peak ripple and able to supply at least 40 mA, ü a Smart Field Communicator (SFC) with STT25M or STT25D or HART Communicator (model 275) with STT25H, ü connection wiring and 250 ohms resistor, ü... -
Page 11: Grounding And Shielding Techniques
Shielding should only be connected to ground at one point to avoid ground loops. STT250 Configuration NOTE: If the transmitter is Model STT25D and configured for digital DE output, the DVM will not display the output during the bench check. The output can be changed to 4-20 mA analog for calibration checks. - Page 12 NOTE: Even though the transmitter is working properly, the SFC may display "CRITICAL STATUS" and an error message when you press "STATUS". The error messages are "INPUT OPEN" "UNCERTAIN READING" "I/P OUT OF SPEC". The "CRITICAL STATUS" message is caused by one of the following: ⇒...
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Page 13: Figure 4: Flow Chart For Analog And De Configuration
Keys Shift Menu 1 Menu 2 Keys DE READ CHANGE PROBE (J, K, etc...) CONF Enter Enter CONF CJ Ext / Int Line Filter Inp Fault Det Next O/P Linear LATCHING CHG LATCHING Enter CONFIG? CFG? NAMUR CHG NAMUR Enter CONFIG? WRITE CHG WRITE PROT? -
Page 14: De Digital Output Configuration
4.5.2 DE Digital Output Configuration The STT25D transmitter can operate in either an analog or a digital DE communications mode. You can use the Smart Field Communicator (SFC) to set transmitter operation mode as analog or digital DE communications. Note that STT25D transmitters are factory set for analog communications operation. -
Page 15: Hart Configuration
STT250 (e.g. damping, calibration, output mode etc.). Since the SFC is a universal configuration tool for a wide range of Honeywell transmitters, some proposed menu items are not possible with the STT250, as listed in Section 3.2.3. -
Page 16: Figure 5: Flow Chart For Hart Configuration
You can check out the performance by varying the input and observing the output response on the DVM. Additional note : This series mode filter should match the local AC supply frequency. 20mA 1 Process PV % rnge Other Variables PVAO Apply values Master Reset... -
Page 17: Mounting
Mounting 4.6.1 DIN Rail Mounting If the STT250 is to be installed on DIN Rail then the main considerations are electrical connections and mechanical fixing. Electrical connections are identical to the bench test instructions (see page 7) except that compensation cable is likely to be used with thermocouples. -
Page 18: Figure 7: Wall Mounting Dimensions
FIELD MOUNT HOUSING FIELD MOUNT HOUSING FIELD MOUNT HOUSING WITH OR WITHOUT WITH METER WITHOUT METER RIGHT VIEW RIGHT VIEW METER FRONT VIEW (5.59) (3.7) (4.53) 46188467-201 Figure 7: Wall Mounting Dimensions FIELD MOUNT HOUSING WITH FIELD MOUNT HOUSING FIELD MOUNT HOUSING FRONT VIEW) OR WITHOUT METER WITH METER... -
Page 19: Figure 9: Spring Loading And Sensor Assembly
SCREWS M4 33 mm SPRINGS FEED-THROUGH HOLE FOR SENSOR WIRES STT250 SENSOR PLATE ASSEMBLY CIRCLIPS 46188463-201 Figure 9: Spring Loading and Sensor Assembly Spring loading is available worldwide with direct head mounting. In North America, the spring loading is typically included in the sensor/thermowell assembly and is available with all housings. -
Page 20: Figure 10: Aluminium Direct Head Mount Housing Dimensions
BB section AA section (33) (40) 2 x M3 2 x M4 1/2" NPT (Dimensions in millimeters) 46188452-0XX Figure 10: Aluminium Direct Head Mount Housing Dimensions BB section CC section (85) AA section (33) 2 x M4 2 x M4 1/2"... -
Page 21: Commissioning
A-A section B-B section (33) 2 x M4 1/2" NPT (80 ) 46188454-0XX Figure 13: Stainless Steel Direct Head Mount Housing Dimensions For more detailed installation drawings, refer to the list in section 5.4. Commissioning Commissioning is carried out after installation and wiring have been completed. Power up the STT250 transmitter and verify via the SFC or HART Communicator that it is configured as required. -
Page 22: Maintenance/Troubleshooting
5. MAINTENANCE/TROUBLESHOOTING Maintenance Maintenance of the STT250 is limited to ensuring that connections, seals and mounting are tight and secure. There are no moving parts or adjustments, thus, the only reason to open the housing is to inspect for corrosion or conductive dust entry which could later affect reliable operation. - Page 23 SYMPTOM SFC MESSAGE/ POSSIBLE CURE DISPLAY CAUSE High input "INPUT OPEN" (with Bad sensor wire Check field wiring and upscale fail-safe) connection. connections for partial short circuit. Check STT250 connections are correct "I/P OUT OF SPEC" polarity. (indicates that the Incorrect Check that the input is above URL or...
- Page 24 SYMPTOM SFC MESSAGE/ POSSIBLE CAUSE CURE DISPLAY Incorrect "STATUS The most common error is Check the output signal CHECK = O.K." changing the sensor appropriate sensor with but does not wiring after probe type wiring and power simulating correspond to selection or after power- cycle when it is device...
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Page 25: Troubleshooting With Hart Communicator
5.2.2 Troubleshooting with HART communicator SYMPTOM HART POSSIBLE CURE communicator CAUSE MESSAGE/ DISPLAY Incorrect None The most common Check the appropriate output signal error is changing sensor wiring and power cycle when it is correct. with the sensor wiring simulating after probe type Remember when changing device... - Page 26 SYMPTOM HART POSSIBLE CAUSE CURE Communicator MESSAGE/ DISPLAY High input "INPUT OPEN" Bad sensor wire Check field wiring connection. (with upscale and connections fail-safe) for partial short circuit. Check STT250 Incorrect operating connections are correct voltage. "I/P OUT OF polarity. SPEC"...
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Page 27: Recommended Parts
Recommended Parts GENERAL DESCRIPTION: Reference STT250 Electronics Module Order from the Model Selection Guide to include options as required. METERS Replacement Smart meter 30757178-501 Replacement Analog meter 30756997-501 Meter mounting bracket kit 46188056-502 Diode for Analog Meter 46188432-501 HEAD MOUNT HOUSINGS (Cable/Conduit entry noted. -
Page 28: Wiring And Installation Drawings Numbers
MISCELLANEOUS PARTS Adaptor plate to install module in field mount housing 46188423-501 Accessories kit (DIN rail clip, terminal screws, fail-safe link, spring loading mounting set) 46188465-501 Spring loading mounting set 46188416-501 46188431-501 DIN rail mounting clip (top hat/"Ω" or "G" rail) Carbon steel mounting bracket for 2"... - Page 29 Smart Temperature Transmitter STT250 – Operator Manual...
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Page 30: Indication Meters
6. INDICATION METERS Introduction Integral meters are supplied already installed by the factory and provide a display of the transmitter output. Table II selection _ _ M gives a 4-20 mA analog output on a moving coil display to ±2% accuracy. A diode fitted across the meter enables loop continuity in the event of a moving coil failure. -
Page 31: Installation/Commissioning
Installation/Commissioning After wiring the meter as shown in Figure 14 and powering up the transmitter loop, verify that the display operates as expected. The Smart Meter may require access to its configuration push button which is accessible via a hole on the side of the indication meter. -
Page 32: Diagnostic And Troubleshooting
Diagnostic and Troubleshooting 6.4.1 Analog Meter The Analog Meter is an irreparable item. If it reads at the bottom of the scale with a known input, check that the connections are good and that the voltage across the meter/diode terminals is 0.5 to 0.7 V. This reading confirms that the delicate moving coil connections have been damaged and that the meter should be replaced. -
Page 33: Ma Analog Mode Calibration Of Smart Meter
6.4.2.2 Meter Fault Conditions The various possible fault conditions with corrective action are: 1. At power up, the LCD stays completely blank. Either the self check failed or the meter is not receiving power. Check the connections. Note that the Smart Meter requires 2.25 Volts supply in addition to the minimum 10.8 Volts for the STT250 transmitter (i.e. - Page 34 • Step 2 - Press and hold side button on meter. Release the button when "CAL" appears on the display. The meter will now carry out a zero (LRV) calibration and revert to normal operation. Press "OUTPUT", "CLEAR" to revert transmitter to continuous output operation.
- Page 35 Smart Temperature Transmitter STT250 – Operator Manual...
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Page 36: Instruction
TRANSIENT PROTECTOR INSTALLATION INSTRUCTION Overview Honeywell's transient protectors external to housings (part number 30755970-501) are designed to protect STT 3000 transmitters from damaging transients induced by lightning or heavy electrical equipment. Transient protectors divert induced surge current around the transmitter. This reduces the voltage potential between the housing and the internal electronic components from several thousand volts to a low and safe level. -
Page 37: Installation Procedure
Installation Procedure The procedure in Table A.2 outlines the steps for installing a transient protector external to an STT 3000 Series STT250 transmitter mounted inside a field mount housing with a 1/2"NPT conduit entry. For direct head mount housings, such as plastic housings, the ground terminal referred to in step 7 below may not exist and another means of direct ground connection will need to be devised. -
Page 38: Wiring Reference
Wiring Reference Figure A.1 shows a typical wiring scheme of a transient protector to the STT 3000 Series STT250. 46188469-201 Figure A-1: Typical wiring of transient protector to STT250 transmitter Smart Temperature Transmitter STT250 – Operator Manual... - Page 39 Smart Temperature Transmitter STT250 – Operator Manual...
- Page 40 HONEYWELL S.A. Zone Industrielle de Longpré 80084 AMIENS Cedex 2 FRANCE...