Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 313

of the input transformer. Voltage during pre-charge is monitored through the input attenuators
on the primary side of the transformer. The M1 contactor connects the MV source to the primary.
Note
Special Installations
Pre-charge inductors may replace the pre-charge capacitors in special installations.
The pre-charge contactors are controlled directly by the NXG code and require no SOP
interaction with the exception of the start pre-charge command.
Figure 8-22
NXGPro+ Control Manual
Operating Manual, A5E50491925A
Type 6 Pre-charge Component Connections
Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
311