Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 274

Advanced Operating Functions
8.17 Synchronous Transfer
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
6. When the voltage achieves "Precharge voltage level" (2634) threshold, M2 is commanded to
open
– Event Log: "Precharge: Open M2",
–
– Even Log: "Precharge: Close M1"
– Once the contactor open is confirmed and transformer flux decays (half second timer),
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
9. When the M1 contactor is confirmed 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 flag 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.
272
"Precharge: Close M2"
start at this state and must not exceed 30 seconds from the time of start until precharge
complete is achieved.
closes.
"PrechargeM2Close_I" is set false", and the state advances to "M2_OPEN".
M1 trip (TIMV) is commanded closed, a timer of 0.5 sec allows flux on the transformer to
decay, and then the state advances to M1_CLOSE.
to "PC_COMPLETE" and setting the "PrechargeComplete_I" flag, and precharge drive run
enable (PrechargeDriveEnable_I). If the 5 seconds times out, precharge is aborted with a
precharge fault.
NXGPro+ Control Manual
Operating Manual, A5E50491925A