Before performing the insulation resistance measurements, disconnect all cables and connectors from the device under test.
The insulation resistance is measured between motor terminals and the frame. When measuring the windings, the auxiliary circuits and other windings are grounded. When measuring the auxiliary circuits, all windings are grounded.
Single winding motors:
|
Test voltage |
Test duration |
Pass criteria |
|
500 VDC |
60 s |
>150 MΩ |
Connect all pins of the LV connector, bearing temperature sensors and heaters to the motor frame.
Connect the measurement devices ground cable to the motor frame.
Connect the measurement probe to the winding phases.
Dual winding motors:
Winding 1
|
Test voltage |
Test duration |
Pass criteria |
|
500 VDC |
60 s |
>150 MΩ |
Connect winding 2 phases to the motor frame.
Connect all pins of the LV connector, bearing temperature sensors and heaters to the motor frame.
Connect the measurement devices ground cable to the motor frame.
Connect the measurement probe to the winding 1 phases.
Winding 2
|
Test voltage |
Test duration |
Pass criteria |
|
500 VDC |
60 s |
>150 MΩ |
Connect winding 1 phases to the motor frame.
Connect all pins of the LV connector, bearing temperature sensors and heaters to the motor frame.
Connect the measurement devices ground cable to the motor frame.
Connect the measurement probe to the winding 2 phases.
