WOGeneric TEAAC / 2008
Siemens AG Operating Instructions 1.03 1RQ671...-Z
33
Start-up
7
7.1 Checking the insulation resistance
Checking the insulation resistance of the stator winding
The insulation resistance of the stator winding needs to be checked prior to commissioning
and again after any extended periods of storage or periods during which the equipment is
not in operation.
WARNING
Hazardous voltage
During and immediately after measurement of the stator winding insulation resistance,
hazardous voltages can be present at some terminals. Contact with these can result in
death, serious injury or material damage.
Check any power cables connected in order to ensure that the line supply voltage cannot
be fed in. Once you have measured the insulation resistance, discharge the winding by
connecting the ground potential.
Measuring the insulation resistance
● Before you begin measuring the insulation resistance, please read the manual for the
insulation resistance meter you are going to use.
● Disconnect any connected main-circuit cables from the terminals before measuring the
insulation resistance.
● Measure the insulation resistance of the winding to the machine housing when the
winding temperature is between 20 and 30 °C. Other values for the insulation resistance
apply at different temperatures.
● When measuring, wait until the final resistance value is reached. This happens after
approximately 1 minute.
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