Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 276

Advanced Operating Functions
8.17 Synchronous Transfer
Note
Operating pre-charge applications with inductor usage
In some applications the pre-charge capacitors have been replaced with inductors. In these
applications it may be necessary to operate pre-charge Type-5 and Type 6 with the M3 contactor
closed for longer periods. Extending the time M3 is closed reduces the current transient through
the pre-charge circuit breaker when M4 closes. The time M3 is closed is extended by holding off
the closing of the M4 contactor. The parameter "Prechrg M4 Holdoff time" (ID 2633) may be used
to specify the amount of time M3 is closed during pre-charge. Parameter 2633 may be adjusted
from 0 to 10 seconds where the default value is 0 seconds which is the value used for the
standard pre-charge arrangement (capacitors vs. inductors).
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NXGPro+ Control Manual
Operating Manual, A5E50491925A