Start-Up; Preparations - Siemens 1PH728 Operating Instructions Manual

Start-up

4.1

Preparations

Safety note
Only expert personnel should be entrusted with work on power installations.
Checking the insulation resistance
After long storage or shutdown periods, the insulation resistance of the windings must be
measured to ground with direct voltage.
CAUTION
Before you begin measuring the insulation resistance, please read the manual for the
insulation resistance meter you are going to use.
Hazardous voltage
During the measurement, and immediately afterwards, hazardous voltage levels are
applied on some of the terminals and they should not be touched. Touching live
components can be result in death or serious injury.
Never touch the terminals when measuring or immediately after the measurement.
Check the supply feeder cables connected in order to ensure that the line supply voltage
cannot be connected.
● Always measure the insulation resistance of the winding to the motor enclosure when the
● When measuring, wait until the final resistance value is reached; this takes approximately
A5E00177602A AD
Siemens AG Operating Instructions 2.02 1PH728
Siemens Hardware
WARNING
WARNING
winding temperature is between 20 and 30°C.
one minute.
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