Rockwell Automation 1768-PA3_PB3 CompactLogix Power Supplies Installation Instructions - Manual (Page 26)

26 1768 CompactLogix Power Supplies
Publication 1768-IN001B-EN-P - July 2006
3. If the controller PWR status indicator is green, troubleshoot the controller
I/O PWR status indicator.
IMPORTANT
This step assumes the power supply PWR and controller PWR
status indicators are green.
If the controller
I/O PWR status
indicator is It means Take this action
Off The controller needs to be replaced. Replace the controller.
Green The controller is operating properly. None
Red
(1)
(1)
When the controller powers up, the I/O PWR status indicator is red momentarily and then changes to green if there are no
issues. However, if the I/O PWR remains red, you should use the table to diagnose and correct any issues.
One of the following:
• The controller needs to be replaced.
• If 1769 I/O modules are installed in
the system, one of the modules needs
to be replaced.
• There is a 1769 power supply
installed in the local I/O bank.
A. If there is a 1769 power supply
in the local I/O bank, remove it
and reapply power.
If the I/O PWR status indicator
remains red, move to the next
step.
B. Disconnect the 1769 I/O
modules from the system.
C. Reapply power.
D. Check the controller I/O PWR
status indicator.
• If the status indicator is
green, the controller is
operating properly and one
of the other 1769 I/O
modules needs to be
replaced.
To troubleshoot the 1769 I/O
modules, see their
respective installation
instructions.
• If the status indicator
remains red, replace the
controller.