Rockwell Automation 1756-xxxx ControlLogix Chassis and Power Supplies Installation Instructions - Manual (Page 55)

Rockwell Automation Publication 1756-IN005C-EN-P - March 2014 55
Install Chassis and Redundant Power Supplies Chapter 2
Remove or Replace a
Redundant Power Supply Use this information to remove or replace a redundant power supply.
Remove a Redundant Power Supply
Follow these steps to remove the redundant power supply.
1. Turn the redundant power supply OFF.
2. Disconnect the line power source voltage from the redundant power
supply and annunciator.
3. Remove the wiring terminal blocks.
4. Unscrew and disconnect the 1756-CPR2 cable.
5. Remove the bottom mounting screws.
6. Loosen the top mounting screws and slide the supply up and off the
mounting screws.
Replace a Redundant Power Supply
Follow the steps below to replace a redundant power supply.
1. Slide the redundant power supply over the top mounting screws and
tighten them.
2. Install the bottom mounting screws.
3. Connect the 1756-CPR2 cable.
4. Install the wiring terminal blocks.
5. Connect the line power source voltage to the redundant power supply and
annunciator.
6. Turn the redundant power supply ON.
When you turn ON the replacement redundant power supply, the
connected chassis automatically draws power from both redundant power
supplies.
WARNING: Remove or replace power supplies only when backplane and power
supply power are removed or the area is known to be nonhazardous. Removal
or replacement of a power supply in a hazardous area can cause an electrical arc
across the contacts if backplane power is still applied.
IMPORTANT You can replace one redundant power supply while the other supply is
operating in nonredundant mode without affecting chassis operation.