Checking The Insulation Of The Assembly; Rotor Cable; Dc Busbars - ABB ACS800 Series Hardware Manual

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Checking the insulation of the assembly

Every converter has been tested for insulation between the main circuit and the
chassis (2500 V rms 50 Hz for 1 second) at the factory.
When checking the insulation of the assembly, proceed in the following manner.
WARNING! Check the insulation before connecting the converter to the power
supply network. Make sure that the converter is disconnected from the grid.

Rotor cable

• Check that all rotor cables are disconnected from the converter output terminals.
• Measure the insulation resistances of the rotor cable and the rotor between each
phase and the protective earth by using a measuring voltage of 1 kV DC.
The insulation resistance must be higher than 1 Mohm.
ohm

DC busbars

• Measure the resistance between each DC busbar and protective earth with a
multimeter.
• Measure the resistance between the DC busbars with a multimeter.
Electrical installation
G
PE
+
-
+
-
R > 1 Mohm
+
-
ohm
PE
+
+
ohm
-
-
R > 100 k

R 
or rises
gradually, depending
on multimeter type