Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 302

Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
• 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)"
– From here on, the start signal must remain true until precharge is complete. A timer will
5. Once the contactor is confirmed 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 off until M1
300
"Precharge: Close M2"
start at this state and must not exceed 30 seconds from the time of start until precharge
complete is achieved.
closes.
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