Preventive Maintenance 143
Insulation resistance measurement
Converter insulation resistance
Insulation resistance measurement for the converter, Please refer to Converter
Insulaiton
Test.
Transformer insulation resistance
If you just need to check the transformer insulation resistance, please refer to following
procedure.
1. Stop, de-energize and ground the drive following the steps in section Shutting down
the drive for maintenance in ACS580MV Hardware Manual (2UBB004520) before you
start the work.
2. Disconnect all electrical connections between integrated transformer and drive, isolate
the cables from ground or frames.
3. Disconnect and earth all external electrical connections, including power, auxiliary,
control, serial communication and ground cables. Ground the transformer cabinet.
4. Short-circuit and ground the primary side of the transformer.
5. Short-circuit and ground all auxiliary windings, heating cables and PT100.
Measurement setup for transformer
6. Short-circuit and ground all secondary three-phase winding systems.
7. Prepare the 5kV insulation resistance tester.
8. Connect plus terminal to secondary phase A terminals, connect minus terminals to
ground.
9. Unground secondary phase A terminals.
10. Apply a test voltage of 5kV for 60 seconds.
The insulation resistance value must >500MΩ in below test condition:
• Ambient temperature in the range of 0 °C to 40 °C
• Relative Humidity <70%
11. Repeat steps 6 to 8 for other following three-winding systems:
• Secondary phase B terminals
• Secondary phase C terminals
• Primary terminals
12. When finished, remove all short-circuit connections and restore to the original state.
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