Rockwell Automation 1771-P4R_P6R Allen-Bradley Redundent Power Installation Instructions - Manual (Page 16)

Allen-Bradley Redundant Power Supplies 16
Publication 1771-IN030B-EN-P - July 2002
Troubleshooting Multiple Power Supplies
If you have multiple power supplies, refer to the flowcharts on the
next three pages to help you troubleshoot when the following
problems occur.
Problem 1
One or more (but not all) of the supplies in the redundant system has
its P/S ACTIVE indicator off. (Depending on the system
configuration, NON REDUNDANT SYSTEM indicators may or
may not be on.)
Turn off the power supply and wait 5 seconds.
Then turn on the power supply.
P/S Active
ON?
yes
no
Done
Turn off the power supply and wait 5 seconds.
Pull the power supply half way out of the chassis, open
switches 5 and 6, and remove redundant cables.
Turn the power supply on to test it without a load.
P/S Active
Off?
yes
no
If ac voltage is OK, replace
the power supply.
Turn off the power supply and wait 5 seconds.
Reset switches 5 and 6 to original positions and reinsert
the redundant cables. Firmly seat the power supply into
the backplane, then turn on the power supply again.
P/S Active
ON?
no
Done
Try replacing the power supply with a known good
power supply.
P/S Active
ON?
yes
Done
P/S Active
ON?
yes
no
Done
Turn off the power supply and check the redundant
cables for continuity and shorts. These shielded
6Ćconductor cables are 1:1.