Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 780)

Section 15B
Replacement Procedures
15B-24
3. Disconnect all cables that are connected to the main power supply
module. Label all cables to simplify installation of the new main
power supply module.
4. Loosen the 4 mounting nuts that hold the main power supply module
to the component enclosure.
5. Replace the main power supply module with a new one.
6. Tighten the 4 mounting screws then reconnect all cables.
ATTENTION: Make sure that all cables are properly attached
to the correct terminals. Failure to do so may result in injury to
personnel, or damage to the control or machine.
7. Turn ON power to the control.