ABB ACA 6 Series, Hardware Manual

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Chapter 3 – Electrical Installation
3-6 ACA 6xx Sections and ACS/ACC 6x7 (132 to 3000 kW) Frequency Converters
Insulation Checks Every ACS 600 MultiDrive system and ACx 6x7 unit (132 to 3000 kW)
has been tested for insulation between main circuit and cabinet
(2500 V rms 50 Hz for 1 minute) at the factory. Therefore there is no
need to check the insulation of the unit again. When checking the
insulation of the assembly, proceed in the following manner:
WARNING! Insulation checks must be performed before connecting
the ACx 600 to the mains. Before proceeding with the insulation
resistance measurements make sure that the ACx 600 is disconnected
from the mains.
Motor and Motor Cable 1. Check that the motor cable is disconnected from the ACx 600
output terminals U2, V2 and W2.
2. Measure the insulation resistances of motor cable and the motor
between each phase and Protective Earth using a measuring
voltage of 1 kV d.c. The insulation resistance must be higher than
1 M
W
.
DC Busbars 1. Measure the resistance between each DC busbar and Protective
Earth with a multimeter.
PE
W
M
R > 1 M
W
PE
W
R > 100 k
W
+
-
+
-