Rockwell Automation 20D DC SCR Precharge Module - Manual (Page 23)

Chapter
2
Start-Up / Troubleshooting
This chapter describes how to start up the DC SCR Precharge Module and
provides basic troubleshooting information.
For information on ... See page ...
Start-Up 2-2
Precharge Control Relay CR LED Indicator 2-3
Troubleshooting 2-4
!
ATTENTION: To avoid an electric shock hazard, verify that the
voltage on the bus capacitors has discharged before removing the
connection. Measure the DC bus voltage at the “+DCin” and
“+DCout” terminals of the Power Module, and at the “+DCin,”
“+DCout,” and “-DC” terminals of terminal block TB1A. The
voltage must be zero.
!
ATTENTION: Power must be applied to the DC SCR Precharge
Module and the drive to perform the following start-up procedure.
Some of the voltages present are at incoming line potential. To
avoid electric shock hazard or damage to equipment, only
qualified service personnel should perform the following
procedure. Thoroughly read and understand the procedure before
beginning. If an event does not occur while performing this
procedure, do not proceed. Remove power including
user-supplied control voltages. User-supplied voltages may exist
even when main DC power is not applied to the DC SCR
Precharge Module. Correct the malfunction before continuing.
!
ATTENTION: There is a second source of power used for the
cooling fan. To avoid an electric shock hazard or moving blades,
verify that the AC-power supply has been removed before
performing any maintenance or repairs.