The following are the conditions which set the DriveReadyToPrecharge_I ag:
• Type 4 precharge selected
• Drive not running
• MV is low (not OK)
• Output to close M1 is open, DO-14 – CIMV
• Output to M1 Permissive is open, (FPGA_M1_PERMIT) – SIB 51, 53, 55 TIMV
• M1 is open, M1 Close Ack – PrechargeM1CloseAck_I – SOP ag
• M2 is open, M2 Close Ack – PrechargeM2CloseAck_I – SOP ag
• Pre-charge circuit breaker is closed – CB2Status_O is true – SOP ag
• Pre-charge voltage monitor permissive is good – PCVMRStatus_O is true – SOP ag
• Trip precharge circuit breaker ag false - TripPrechargeCB2_O - command to trip is false - from
SOP
• No medium low fault
• LFR not tripped (LFR status – DI-3E) and latched (due to Input Protection) and Internal I/O
working
• No pre-charge fault exists
• MV is not disabled, MainInputVoltageDisable_O is false
• No pre-charge circuit breaker alarm active
• Internal I/O for M1 is working (if an input breaker exists)
• No pre-charge contactor alarm active
• No pre-charge main contactor fault
• No input protection fault
• Drive has an input breaker (M1) - "Drive Has Input Breaker" (7127)
• Precharge has not been attempted more than 5 times per hour and not within the past
minute (if enabled)
Pre-charge sequence
The sequence for precharge is as follows:
1. The Precharge State machine starts in the "PRECHARGE_FAULTED" to initialize. Must
have DriveReadyToPrecharge_I to advance.
2. Once initialized it advances to the "INIT_PRECHARGE2" initial state to wait for
the DriveReadyToPrecharge_I condition to go true.
3. Once true, the state advances to the "PRECHARGE_READY" state to wait for the precharge
start. Losing the Ready status will reset the state machine to "INIT_PRECHARGE2".
Advanced Operating Functions
8.17 Synchronous Transfer
NXGPro+ Control Manual
Operating Manual, A5E50491925A 271
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