Tools Required; Parts Required; Install The Chassis Adapter; Install The Redundant Power Supplies - Allen-Bradley 1756-PA75R Installation Instructions Manual

ControlLogix Redundant Power Supply

Tools Required

When installing your chassis and power supplies, the following items are required:
• 3.18 mm (0.125 in.) slotted screwdriver
• 6.35 mm (0.25 in.) slotted or #2 Phillips screwdriver
• Torque screwdriver
• Needle-nose pliers

Parts Required

Each redundant power supply requires four #10 Phillips screws for installation. Eight #10 Phillips screws are required to install two redundant
power supplies.
Install the Chassis
IMPORTANT Install the chassis in the enclosure and make sure that you follow the minimum spacing requirements. See the ControlLogix Chassis Installation Instructions,
publication 1756-IN621

Install the Chassis Adapter

1. Align the circuit board of the 1756-PSCA2 or 1756-PSCA2XT chassis adapter with the card guides on the left side of the chassis.
2. Slide the adapter back until it is flush with the front of the chassis.
WARNING: EXPLOSION HAZARD
If you connect or disconnect the 1756-CPR2 cables while either backplane power source is on, an
electric arc can occur. This could cause an explosion in hazardous location installations. Repeated
electric arcing causes excessive wear to contacts on both the module and its mating connector.
Worn contacts may create electrical resistance that can affect module operation.
Be sure that power is removed or the area is nonhazardous before proceeding.

Install the Redundant Power Supplies

IMPORTANT Install the redundant power supplies in the enclosure and make sure that you follow the minimum spacing requirements. See the ControlLogix Chassis
Installation Instructions, publication 1756-IN621, for more information.
Follow these steps to install your redundant power supplies.
1. Drill holes in the back panel of the enclosure for the redundant power supply.
ATTENTION: Do not drill holes for a redundant power supply above installed equipment. Metal chips from drilling can damage the backplane and cause
intermittent operation.
2. Insert the #10 Phillips screws into the top mounting holes, but do not tighten completely.
3. Slide the redundant power supply over the installed screws and tighten the screws.
4. Insert the bottom screws and tighten them.
5. Repeat these steps for additional power supplies.
6
• Crimper
• Wire stripper
• Drill
for more information.
Rockwell Automation Publication 1756-IN620D-EN-P - October 2018
Card Guide