ABB ACS 6000 - Changing RC-IGCTs in 3;5 MVA Phase Modules

ABB
Chapter 6 - Insulation Resistance Measurement
ACS 6000 Commissioning Manual
3BHS135824 ZAB E01Rev. D 31 (of 62)
Type 3: Grounding switch must be open
6.2.2 LSU Preparation
The following preparatory measures must be taken in aLine Supply Unit
(LSU):
DC_plus
DC_NP
DC_minus
All necessary short circuit connections are already made in TEU.