DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
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Commissioning<br />
Checking the insulation<br />
The insulation resistance of the windings with respect to the <strong>motor</strong> frame must be<br />
checked with <strong>DC</strong> voltage before the <strong>motor</strong> is put into operation for the first time and<br />
after a lengthy period of storage or standstill.<br />
Measuring-circuit voltage<br />
The maximum permissible measuring-circuit voltage for measuring the insulation<br />
resistance on electrical components is basically 500 V.<br />
A measuring-circuit voltage of 1000 V is permissible in an exceptional case for new<br />
windings only, provided that previously the insulation resistance has been<br />
measured with a measuring-circuit voltage of max. 500 V and the insulation value<br />
was not lower than the permissible value.<br />
When taking the measurement, you must wait until the measured value remains<br />
constant.<br />
Warning<br />
After the measurement the electrical components must be discharged by being<br />
grounded.<br />
Minimum insulation resistance<br />
Table 4-1 Minimum insulation resistance (for winding temperature of 25°C)<br />
Value<br />
Measuring-circuit voltage 500 V (min. 100 V)<br />
Minimum insulation<br />
10 MΩ<br />
resistance with new, cleaned<br />
or repaired windings<br />
Critical specific insulation<br />
resistance after a long<br />
operating time<br />
Insulation resistance<br />
0.5 MΩ/kV<br />
Dry, new windings have insulation resistances of between 100 and 2000 MΩ, or<br />
possibly even higher values. If the insulation resistance is close to the minimum<br />
value, then the cause could be either humidity and/or dirt accumulation. If the<br />
insulation resistance falls below the minimum value, determine the cause, and<br />
clean and dry the winding.<br />
SIEMENS AG T61160347010001 (DMHO V9)<br />
4-4 Operating instructions 1GG6286-0NA4.-1VV1-Z