Rockwell Automation 1771-P4R_P6R Allen-Bradley Redundent Power Installation Instructions - Manual (Page 18)

Allen-Bradley Redundant Power Supplies 18
Publication 1771-IN030B-EN-P - July 2002
Problem 3
All P/S ACTIVE indicators show that the power supplies are OK,
but one or more NON REDUNDANT SYSTEM indicators are on,
indicating the desired redundancy is not available.
Check the redundant cables for continuity and
shorts. These shielded 6Ćconductor cables are 1:1.
P/S Active
ON?
yes
no
Done
Check switches 5 and 6 on all supplies to make
sure settings on each are the same.
P/S Active
Off?
yes
no
If ac voltage is OK, replace the
power supply, but do not turn
the ac power switch on.
Continue to test other supplies.
Try replacing the power supply with a known good
power supply.