BA 2320
Operating Instructions, 02/2015, 70000004023775
43
Commissioning
5
5.1
Checking the insulation resistance
Work on power installations must only be carried out by specialists.
WARNING
Lock-out the drive unit to prevent it from being started up unintentionally
Attach a warning notice to the start switch.
WARNING
All covers which are designed to prevent active / live or rotating parts from being touched,
or which are necessary to ensure correct cooling, must be installed prior to commissioning
WARNING
During the measurement, and immediately afterwards, in some cases the terminals are at
hazardous voltage levels and they must not be touched
Carry out a check on the power cables connected to ensure that no voltage can be applied.
NOTICE
The insulation resistance 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
Before measuring the insulation resistance, read the manual for the insulation resistance
meter you are going to use. Disconnect any main circuit cables already connected from the
terminals before measuring the insulation resistance.
NOTICE
If the critical insulation resistance is less than or equal to this value, the windings must be
dried or, if the rotor is removed, cleaned thoroughly and dried
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.
If the measured value is close to the critical value, you must subsequently check the
insulation resistance at appropriately frequent intervals.
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