26 Rockwell Automation Publication 750-RM100A-EN-P - August 2019
Chapter 3 Precharge Sequence
6. The AC precharge board closes the AC precharge contactor to connect
the precharge resistor bank to the DC bus and the LCL filter module.
7. When the DC bus is 85% of nominal voltage rating, the AC precharge
circuit closes the AC precharge circuit breaker (CB1). The AC precharge
contactor opens to disconnect the precharge resistor bank from the DC
bus.
8. The switched mode power supply (SMPS) of the converter and inverter
power modules is at 400V DC.
9. The power layer interface (PLI) board, current sense board (CSB), and
gate driver are powered by SMPS.
10. The main control board checks communications between AC precharge
board, PLI board, CSB board, and gate driver.
11. If the check comes back ‘Ok’, the precharge is complete and the drive is
ready.
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