Rockwell Automation 1768-PA3_PB3 CompactLogix Power Supplies Installation Instructions - Manual (Page 24)

24 1768 CompactLogix Power Supplies
Publication 1768-IN001B-EN-P - July 2006
2. If the power supply is operating properly, troubleshoot the controller
PWR indicator.
Red The power supply
cannot produce valid
24V power to the
1768 modules. A. Disconnect all modules from the system.
B. Reapply power.
C. Check the PWR status indicator.
• If the status indicator remains red, replace the power
supply.
• If the status indicator is green, one of the other modules
in the system is causing the red indicator. Move to the
next step.
D. Reinstall any 1768 motion or communication modules.
E. Reapply power.
• If the status indicator is green, either the 1768 controller
or one of the 1769 I/O modules is causing the red
indicator.
• If the status indicator remains red, one of the 1768
communication or motion modules is causing the red
indicator. Move to the next step.
F. Disconnect the 1768 communication or motion modules from
the system one at a time.
G. After each module is removed from the system, reapply
power to the power supply and check the PWR status
indicator.
• If the status indicator is green, the most
recently-removed 1768 module caused the red indicator
and should be replaced.
• If the status indicator remains red, continue
disconnecting 1768 modules one at a time until the PWR
status turns green.
IMPORTANT
This step assumes the system is fully assembled and the power supply PWR
status indicator is green.
If the power
supply PWR
status
indicator is It means Take this action