Emerson ControlWave Instruction Manual page 144

Redundant Power Supply Sequencer Module (RPSSM)
Caution
P-8
Should a power supply fail, you must use a replacement supply that has
an identical bracket assembly (black anodize or gold irridite). The RPSSM
must have one power supply with each type of assembly or it will not
function. You cannot have two black anodize power supplies installed or
two gold irridite supplies installed on the same RPSSM.
To remove one of the power supplies, first turn the power supply's
ON/OFF switch off (the down position, as shown in Figure P-9). Loosen
the plastic screw either by hand or with a Phillips screwdriver. Grasp the
bracket and gently pull the power supply straight out of the assembly.
Figure P-9. Hot Swapping a Power Supply
To re-insert the power supply, grasp the bracket and line up the board
with the grooves in the assembly. Gently slide the card into the RPSSM
until it inserts into the connector. Gently tighten the screw either by hand
or with a Phillips screwdriver. Now turn the On/Off switch on (the up
position).
Installation and Use Revised Nov-2010