Rockwell Automation 2364E Non-Regenerative DC Bus Supply Unit (NRU) - Manual (Page 62)

Publication 2364E-5.01 April 2002
10-2 Troubleshooting
Checklist for Troubleshooting
Your NRU The following table provides a checklist to help you identify the
cause of your NRU problem.
Figure 10.1
Troubleshooting Chart
Important: Refer to the system schematics, Appendix A of this
manual, and the chapter of this manual that corresponds
to your NRU for ratings.
Type of Problem
Loss of DC Bus
Power & Control
Power
Loss of DC Bus
Power Only
Loss of Control
Power Only
Fault Indication Did you check the:
3-Phase AC Incoming Power
Circuit Breaker or MCP Operation
3-Phase Fusing
Diode Bridge
DC Choke
Control Transformer Fusing
Control Transformer Secondary
Voltage and/or Secondary Fusing
Bridge Fan
Over-Temperature Switch
Phase Loss
Phase Imbalance
External Customer Interlocks
(if present)