Rockwell Automation LPM20 Liquid-Cooled AC Drive with High Performance Drive Control - Manual (Page 46)

1-34 Installation/Wiring
Pre-charge Operation The pre-charge bypass contactor is controlled by the active converter. On
power up, the contactor is open so the pre-charge resistors limit the current
charging the DC link. The contactor may operate in one of three ways as
selected by 700AC-Parameter 50 - [Start Config]:
• If “Run On Start” is selected, then logic must be added to the application
to turn on 700AC-Parameter 70 - [Converter Control] bit 0 to close the
pre-charge and enable the converter to regulate the DC Link Voltage. The
inverter may not be started until 700AC-Parameter 71 - [Converter
Status] bits 2 and 3 have been turned on by the active converter.
• If “Run On PwrUp” is selected, then the pre-charge bypass contactor is
automatically closed several seconds after power is turned on and the
converter is automatically enabled.
• If “Manual Cntrl” is selected, then the pre-charge bypass contactor is
manually controlled by 700AC-Parameter 52 - [Manual Control] bit 0,
and enabling of the active converter is manually controlled by
700AC-Parameter 52 bit 1. This mode is primarily intended for
troubleshooting or during startup.
Wiring the Active Converter
Control Board I/O Terminals Terminal blocks A11-P2 and A12-P1 contain connection points for all
inputs, outputs, and power connections to the Active Converter Control
Board.
Remove the terminal block plug from the socket, and make connections. For
more information, please refer to the PowerFlex 700 Active Converter
Power Module User Manual (Publication No. PFLEX-UM002…).
Reinstall the plug after wiring is complete. The terminal blocks have keys,
which make it difficult to insert a terminal plug into the wrong socket.
!
WARNING: The user must verify that the pre-charge is closed
before enabling the inverter or the pre-charge resistors may be
damaged. This can be done with a Logix application program or by
wiring the auxiliary contacts on the pre-charge bypass contactor in
series with the run permissive on the inverter.