Commissioning
7.3 Checking the insulation resistance
Synchronous/induction motors 1PH813
54 Operating Instructions, 04/2009, 610.48000.22
NOTICE
Holding brake
The brake can only be used in certain cases (power failure, EMERGENCY OFF). The
brake must not be used as an operating brake. When the motor is shut down, the brake
operates as a holding brake.
7.3 Checking the insulation resistance
After long storage or shutdown periods, the insulation resistance of the windings must be
measured to ground with direct voltage.
WARNING
Work on power installations must only be carried out by specialists. Before measuring the
insulation resistance, read the manual for the insulation resistance meter you are going to
use.
WARNING
Danger! High voltage
During and immediately after the measurement, hazardous voltage levels may be present.
Touching live components can be result in death or serious injury.
Never touch the terminals when measuring or immediately after the measurement.
Check the connected supply feeder cables to ensure that the line supply voltage cannot be
connected.
● Always measure the insulation resistance of the winding to the motor enclosure when the
winding temperature is between 20 and 30°C.
● When performing the measurement, wait until the final resistance value is reached (this
takes approx. one minute).
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