Standard motors
56100000002001, 02/2013
51
7 Commissioning
7.1 Insulation resistance
WARNING
Working on electrical power installations
Only appropriately trained personnel may carry out this work.
Before starting commissioning, install all covers that are designed to
prevent active or rotating parts from being touched, or which are
necessary to ensure correct air guidance and thus effective cooling.
WARNING
Hazardous voltage at the terminals
Dangerous voltages are sometimes present on the terminals during and
immediately after measurement of the winding insulation resistance.
Contact with these can result in death, serious injury or material damage.
If any power cables are connected, check to make sure line supply
voltage cannot be connected. Once you have measured the insulation
resistance, discharge the winding by connecting to the ground potential.
Checking the insulation resistance
NOTICE
The insulation resistance needs to be checked prior to start-up and again after any
extended periods of storage or periods during which the equipment is not in
operation. Before you begin measuring the insulation resistance, please read the
operating manual for the insulation resistance meter you are going to use.
Disconnect any main-circuit cables that are connected to the terminals before
measuring the insulation resistance.
Note
If the critical insulation resistance is less than or equal to this value, the windings
must be dried or, if the fan is removed, cleaned thoroughly and dried.
Please note that the insulation resistance of dried, clean windings is lower than that
of warm windings. The insulation resistance can only be properly assessed after
conversion to the reference temperature of 25 °C.
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