Commissioning
5.1 Checking the insulation resistance
BA 2320
44
Operating Instructions, 02/2015, 70000004023775
Wherever possible, measure the minimum insulation resistance of the winding to the motor
housing at a winding temperature of +20 °C to +30 °C. Other values for the insulation
resistance apply for temperatures outside this range. When making the measurement, wait
until the final resistance value is reached, approx. 1 minute.
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
N
< 2 kV and a winding temperature of +25 °C.
500 V
Measuring circuit voltage
10 MΩ
Minimum insulation resistance with new, cleaned or repaired windings
0.5
MΩ/kV
Critical specific insulation resistance after a long operating time
Observe the following:
●
When measuring at winding temperatures other than +25 °C, the measured value must
be converted to the reference temperature of +25 °C. The insulation resistance is halved
for every 10 K increase in temperature, and it is doubled for every 10 K decrease in
temperature.
●
If the insulation resistance is close to or below the minimum value, the cause could be
humidity and dirt accumulation. The windings must then be dried.
●
During operation, the insulation resistance of the windings can fall to the critical insulation
resistance due to ambient and operational influences. The critical insulation resistance for
a +25 °C winding temperature can be calculated, depending on the rated voltage, by
multiplying the rated voltage (kV) by the specific critical resistance value (0.5
MΩ/kV);
e.g. critical resistance for rated voltage (U
N
) 690 V: 690 V x 0.5
MΩ/kV
= 0.345
MΩ.
Summary of Contents for MOTOX BA 2320
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Page 42: ...Mounting 4 7 Connecting the motor BA 2320 42 Operating Instructions 02 2015 70000004023775 ...
Page 48: ...Operation BA 2320 48 Operating Instructions 02 2015 70000004023775 ...
Page 64: ...Disposal BA 2320 64 Operating Instructions 02 2015 70000004023775 ...
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