6. When the voltage achieves "Precharge voltage level" (2634) threshold, M2 is commanded to
open
– Event Log: "Precharge: Open M2",
– "PrechargeM2Close_I" is set false", and the state advances to "M2_OPEN".
– Even Log: "Precharge: Close M1"
– Once the contactor open is conrmed and transformer ux decays (half second timer),
M1 trip (TIMV) is commanded closed, a timer of 0.5 sec allows ux on the transformer to
decay, and then the state advances to M1_CLOSE.
7. Secondary M1 close command (CIMV), (DO-15 - J4-7,8,9, - CIMV for Gen4e precharge type
4) is iss ued and the state advances to "WAIT_FOR_M1_ACK".
– Event log: "Precharge: Waiting for M1 to close..."
8. While waiting for M1 to close (M1 ACK), PrechargeM1CloseAck_O, the excessive drive loss
decay curve is reset.
– Event Log: "M1 Closed - waiting for transformer voltage to rise"
– Also it allows 5 seconds for the fundamental input voltage to get to 80% before advancing
to "PC_COMPLETE" and setting the "PrechargeComplete_I" ag, and precharge drive run
enable (PrechargeDriveEnable_I). If the 5 seconds times out, precharge is aborted with a
precharge fault.
9. When the M1 contactor is conrmed closed and MV exists, cell diagnostics is enabled. This
sets the precharge complete.
– Event Log: "Precharge complete: No errors"
10.Once in the Precharge complete state is achieved, it will be maintained until reset in the fault
loop. The precharge state machine will no longer run or check for errors. The error checking
is turned over to the normal fault detection. The StartCellPrecharge_O signal should be
removed at this point.
11.If the CimvIsPulsed_O ag is true, the CIMV close command will drop out one second after
achieving MV. The actual relay will stay in until the MV contactor is tripped.
SOP ags used in Precharge:
• DriveReadyToPrecharge
• DriveReadyToPrecharge_I – ag that indicates all conditions are met for precharge to
commence
• PrechargeM1CloseAck_I – ag to indicate M1 status (true is closed)
• PrechargeM2CloseAck_I – ag to indicate M2 status (true is closed) CB2Status_O – ag to
indicate CB2 status (true is CB2 closed)
• CB2Status_O - ag to indicate CB2 status (true is CB2 closed)
• PCVMRStatus_O – ag to indicate CB2 voltage status (true is CB closed – no UV condition)
• TripPrechargeCB2_O – Command precharge CB2 to trip (set in SOP) – causes precharge fault
• MainInputVoltageDisable_O – ag to disable the M1 contactor (true is command to open)
• ClosedPrechargeCB_I – ag to trip the breaker (true is trip) – must connect to output
hardware
Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
NXGPro+ Control Manual
Operating Manual, A5E50491925A 301
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