Type 5 (Open) Pre-Charge - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
– No input protection fault
Setting StartCellPrecharge_O to true initiates the pre-charge sequence. Pre-charge will
not initiate if DriveReadyToPrecharge_I is not true, or any of the above conditions are not
met.
8.19.6

Type 5 (Open) Pre-charge

Type 5 pre-charge controls the main contactor, M1 and uses three pre-charge contactors M2,
M3, and M4. It is designed so that M1 will not close until after M4 opens. This designates type
5 pre-charge as a break-before-make, or open pre-charge type.
Type 5 pre-charge can be implemented only with the user I/O board due to the dedicated I/O
controlled directly through the NXGpro code.
Note
Pre-charge fault correction
On any pre-charge fault, you must examine the event log for the cause, and correct the problem
before proceeding to another attempt.
Note
Pre-charge benefit
The benefit of pre-charge is to limit transformer in-rush.
304
Note
Cells in bypass
If any cells are in bypass prior to losing MV, their respective bypass contactor is opened
since the bypass contactor power supply is energized by one phase of the MV input.
During the subsequent pre-charge, if the cell is detected as faulted, pre-charge will pause
indefinitely until a manual drive reset is activated.
Pre-charge will then proceed and the detected faulted cell will be bypassed after pre-
charge is complete.
NXGPro+ Control Manual
Operating Manual, A5E50491925A