Rockwell Automation 1768-PA3_PB3 CompactLogix Power Supplies Installation Instructions - Manual (Page 23)

1768 CompactLogix Power Supplies 23
Publication 1768-IN001B-EN-P - July 2006
Interpret the LED Indicators
The CompactLogix power supply works with the CompactLogix controller to
provide power to the system. Because the power supply and controller are each
required, you must consider both when attempting to troubleshoot a power issue in
your system.
To troubleshoot any system power issues, use the CompactLogix power supply
PWR status indicator and the CompactLogix controller PWR and I/O PWR
status indicators. You should troubleshoot the power supply and controller status
indicators in a specific order.
1. Troubleshoot the power supply PWR status indicator.
If the power supply is not operating properly, the controller will not be
operating properly either. You must first diagnose and correct any issues
with the power supply before troubleshooting the controller.
LED Indicators
IMPORTANT
In multiple instances throughout this section, we recommend that you
disconnect, reconnect, or replace components in the 1768 CompactLogix
system. Before you disconnect, reconnect, or replace any component, make
sure you have turned off power and allowed all system status indicators to turn
off.
If the power
supply PWR
status
indicator is It means Take this action
Off One of the following:
The supply is turned
off or it does not have
adequate
input power. Verify that the power supply is turned on and that adequate input
power is properly connected.
A short/overload
condition exists in the
1768 system. Isolate the power supply so that it is disconnected from all parts
of the system and apply power. If the indicator remains off, verify
adequate input power or consider replacing the power supply.
The supply needs to
be replaced. Replace the power supply.
Green The power supply is
operating properly. No action necessary for the power supply. Check the controller
PWR and I/O PWR status indicators to make sure the entire
system is operating properly.