• 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".
4. When the StartCellPrecharge_O is set true from the PRECHARGE_READY state, it commands
M2 to close (connects capacitor), PrechargeM2Close_I is set true, and advances to the
"M2_CLOSE" state.
– Event Logs: "Precharge Start type 4 (open)"
"Precharge: Close M2"
– From here on, the start signal must remain true until precharge is complete. A timer will
start at this state and must not exceed 30 seconds from the time of start until precharge
complete is achieved.
5. Once the contactor is conrmed closed, the state advances to "WAIT_FOR_VOLTS2" where it
waits for a voltage level of the max phase voltage set by the parameter "Precharge voltage
level" (2634).
– Event Log: "Precharge Waiting for voltage buldup..."
– This counts as one precharge attempt for the counter. Cell diagnostics is held o until M1
closes.
Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
NXGPro+ Control Manual
300 Operating Manual, A5E50491925A
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