Troubleshooting a single power supply – Rockwell Automation 1771-P4R_P6R Allen-Bradley Redundent Power Installation Instructions User Manual

Page 15

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Allen-Bradley Redundant Power Supplies

15

Publication 1771-IN030B-EN-P - July 2002

Troubleshooting a Single Power Supply

If you have a single power supply installed in an I/O chassis and
its P/S ACTIVE indicator is off, follow the troubleshooting
flowchart below.

Turn off the power supply and wait 5 seconds.

Check I.D. Selection and Configuration switch settings.

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 and

turn it 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.

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

Try replacing the I/O modules (one of them could be

overloading the power supply).

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