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Maintenance
9.2 Inspection and maintenance
NOTICE
Reduction of the degree of protection
If condensation drain holes are not closed, then this can result in material damage to the
motor.
In order to maintain the degree of protection, after the condensation has been drained, you
must close all of the drain holes.
9.2.12
Insulation resistance and polarization index
Measuring the insulation resistance and polarization index (PI) provides information on the
condition of the machine. It is therefore important to check the insulation resistance and the
polarization index at the following times:
● Before starting up a machine for the first time
● After an extended period in storage or downtime
● Within the scope of maintenance work
The following information is provided regarding the state of the winding insulation:
● Is the winding head insulation conductively contaminated?
● Has the winding insulation absorbed moisture?
As such, you can determine whether the machine needs commissioning or any necessary
measures such as cleaning and/or drying the winding:
● Can the machine be put into operation?
● Must the windings be cleaned or dried?
Detailed information on testing and the limit values can be found here:
"Testing the insulation resistance and polarization index"
9.2.13
Maintaining the external fan (forced ventilation)
Rotating or live parts
Live electrical parts are dangerous. Contact with them can cause death, serious injury or
material damage.
Before performing any maintenance work on the external fan, disconnect it from the mains,
particularly before opening the terminal box. Make sure that the device cannot be switched
back on.
118
WARNING
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 06/2020, A5E44455710A
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