Rockwell Automation 1771-P3_P4_P5_P5E Power Supply Modules Installation Instructions - Manual (Page 15)

Power Supply Modules 15
Publication 1771ĆIN073A-EN-P - March 2002
8. If you have only one power supply in your chassis and it passed
step 7 (the P/S ACTIVE light turned on), verify that the power
supply is not overloaded by performing steps 9 through 11.
9. Turn the power supply off and wait 15 seconds (-P3 and -P4) or
45 seconds (-P5 and -P5E).
10. Firmly seat the power supply in the chassis.
11. Restore power to the I/O chassis, and turn the power supply
module on.
If the P/S ACTIVE
indicator is:
Then:
On
The power supply is operating correctly and the system should
operate normally.
Off
Replace the power supply module with a known good operating
supply. The system should operate normally.
Checking for Open or Shorted Paralleling Cable
Important: Continue with this procedure only if you are using two
power supply modules in the same chassis. This
procedure checks for an open or shorted 1771-CT
paralleling cable.
Before you begin, turn I/O chassis power off. Both power supply
modules should be turned off and partially pulled out of the chassis.
!
ATTENTION
Remove input power to the I/O chassis before
removing the power supply module from the
chassis. Failure to do this may result in injury to
personnel and/or damage to equipment.
1. Test the 1771-CT paralleling cable by verifying the ground
connection between power supplies.
2. Test for a short circuit by performing steps 3 through 5.
3. Plug one end of the paralleling cable into one of the power supply
modules (the other end should not be connected).
4. Turn the power supply on. If the P/S ACTIVE indicator turns on
this end of the cable is okay.
5. Unplug the cable, and plug the other end of the cable into the
power supply.
If the P/S ACTIVE
indicator :
Then:
Turns On This end of the cable is all right.
Does not turn On The paralleling cable has a short circuit. Replace the cable.