Commissioning The Motor - Siemens SIMOGEAR BA 2330 Operating Instructions Manual

Commissioning
7.2 Commissioning the motor
Note
If the critical insulation resistance is less than or equal to this value, then the windings must be
dried or, if the rotor is removed, cleaned thoroughly and dried.
After drying cleaned windings remember that the insulation resistance is lower for a warm
winding. 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 check the insulation resistance at
suitably frequent intervals.
Measure the minimum insulation resistance of the winding with respect to the motor
enclosure at a winding temperature between +20 °C and +30 °C. Different insulation
resistance values apply for deviating temperatures. When making the measurement, wait
for 1 minute for the final resistance value to be reached.
Measure the critical insulation resistance at the operating temperature of the winding.
Limit values
The following limit values are valid for the insulation resistance at a rated voltage of U
and a winding temperature of +25 °C.
500 V
10 MΩ
0.5 MΩ / kV
Comply with the following points:
• If you measure a winding temperature other than +25 °C, convert the measured value to the
reference temperature +25 °C. The insulation resistance halves for every 10 K temperature
increase. The resistance doubles for every 10 K temperature decrease.
• If the insulation resistance is close to or below the minimum value, the cause could be
humidity and dirt accumulation. Dry the windings.
• During the operating time, the insulation resistance of the windings decreases to the critical
insulation resistance due to ambient and operational influences. Calculate the critical value
for a winding temperature of +25 °C. Multiply the rated voltage (kV) by the specific critical
resistance value (0.5 MΩ/kV). Example: Rated voltage U
kV = 0.345 MΩ.
7.2

Commissioning the motor

Note
Protect the motor against overload.
Do not exceed or undershoot limit speeds, e.g during operation with a backstop.
84
Measuring circuit voltage
Minimum insulation resistance for new, cleaned or repaired windings
Critical specific insulation resistance after a long operating time
690 V: 690 V x 0.5 MΩ/
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Motors for mounting onto SIMOGEAR gearboxes
Operating Instructions, 01/2024, A5E53220841A/RS-AA
< 2 kV
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