Operation Flow Charts - Allen-Bradley 8720MC-RPS065 User Manual

Chapter 8 Troubleshoot the 8720MC-RPS Unit
106

Operation Flow Charts

These flow charts track the 8720MC-RPS unit power-up sequencing to make
sure that the unit has power applied and that the DC-bus is at an acceptable
voltage level.
Figure 47 - 8720MC-RPS Unit Fails to Power Up
The 8720MC-RPS unit
does not run.
Is AC power applied to the
8720MC-RPS unit?
Yes
RUN sequence
input entered?
Yes
Is Precharge
complete?
Yes
Is the main magnetic
contactor operating?
Yes
The 8720MC-RPS unit is
defective. Replace the unit.
Rockwell Automation Publication 8720MC-RM001K-EN-P - September 2018
Check the following:
• Circuit breaker
No
• Protection fuse
• Wiring
• Power supply
Check wiring for the sequence signals.
No
Check the following:
• Setting of the Precharge/Discharge Time (F.014)
No
• Precharge/Discharge resistor and associated wiring
Check the following:
• Wiring for sequence signals
No
• Wiring to main magnetic contactor coil
• Order of phases of wiring for main power supply
and control power