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 o
the closing of the M4 contactor. The parameter "Prechrg M4 Holdo 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).
Advanced Operating Functions
8.17 Synchronous Transfer
NXGPro+ Control Manual
274 Operating Manual, A5E50491925A
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