Prerequisites to initiating pre-charge types 5 or 6
• The DriveReadyToPrecharge ag in the lower right corner must be set true for pre-
charge to begin. Monitor the progress on the ‘MedVolts’, ‘Precharge State’, and
‘PrechargeExitState’ variables on the right side. Every step in the pre-charge sequence is
logged in the event log, including any fault conditions that abort pre-charge. Also the exit
condition from the pre-charge state machine is logged.
• If all conditions are met, the DriveReadyToPrecharge_I ag is true. If any conditions
are not met, the ag is set false, therefore this ag can be used as part of the conditions to
start pre-charge. Pre-charge cannot be initialized or started if this ag is not true. Once pre-
charge commences, the ag goes false and remains false until all conditions are again met.
• When all conditions are met, the pre-charge state machine advances from the initial state of
"PRECHARGE_FAULTED" through "INIT_PRECHARGE2", into the "PRECHARGE_READY"
state. The loss of the DriveReadyToPrecharge_I ag causes the state machine to cycle
back to "INIT_PRECHARGE2" until the drive is ready.
– Type 5 or 6 pre-charge selected
– Drive not running
– MV is low (not OK)
– Output to M1 Permissive is open, DO-2d – P14 – TIMV
– Output to close M1 is open, DO-1c – P9 – CIMV
– M1 is open, M1 Close Ack – DI-2e – P18
– M2 is open, M2 Close Ack – DI-3d – P15
– M3 is open, M3 Close Ack – DI-0e – P16
– M4 is open, M4 Close Ack – DI-1e – P17
– No medium low fault
– LFR not tripped and latched (due to Input Protection) or dedicated input protection isn't
used
– No pre-charge fault exists
– MV is not disabled, MainInputVoltageDisable_O is false, or maintenance or service
mode is enabled.
– No pre-charge circuit breaker alarm active
– No pre-charge contactor alarm active
– No pre-charge main contactor fault
Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
NXGPro+ Control Manual
Operating Manual, A5E50491925A 303
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