Chapter 6 - Insulation Resistance Measurement
ABB
30 (of 62)
3BHS135824 ZAB E01Rev. D ACS 6000 Commissioning Manual
4
The cooling water conductivity must be below 0.5
µ
S.
Note that the insulation measurement must be carried out within 1
hour. Otherwise the cooling water conductivity might become too
high.
5
Switch off the auxiliary voltage of the converter.
6
Prepare each ACS 6000 cabinet for the measurement as described
in the following chapters.
The preparation described in this manual refers to insulation
measurement which is carried out with 5kV DC voltage. For high
voltage tests additional preparation will be necessary!
6.2.1
TEU Preparation
The following preparatory measures must be taken in a Terminal Unit
(TEU):
1
Short circuit input and output (motor) terminals.
optional isolator
1
2
Make a short circuit between shorted terminals, DC plus, DC neutral
point and DC minus busbars.
3
Turn optional isolators into the required position.
Type 1: Isolator switch must be closed
Type 2: Grounding isolator must be open
