Prerequisites to initiating pre-charge types 1, 2 or 3
• 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
"INIT_PRECHARGE", into the "WAIT_FOR_VOLTS" state and pre-charge becomes active.
The loss of the DriveReadyToPrecharge_I ag causes the state machine to remain in
the "INIT_PRECHARGE" state until the drive is ready and the PrechargeStartEnable_O
ag is set true.
– Type 1, 2, or 3 pre-charge selected
– Drive not running
– MV is low (not OK)
– Output to M1 Permissive is open, PrechargeM1Close_I is false
– M1 is open, PrechargeM1CloseAck_O is false
– M2 is open, PrechargeM2CloseAck_O is false
– M3 is open, PrechargeM3CloseAck_O is false
– 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
– No input protection fault
Advanced Operating Functions
8.18 Pre-charge using SOP
NXGPro+ Control Manual
Operating Manual, A5E50491925A 289
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