Installation Instructions

–48 V DC P ower Supply Module (PSM) Shelf Chapter 10: PSM Shelf R eplacement Procedures
Procedure 10 -1 R emo ving the failed –48 V DC PSM shelf (Continued)
4
PSM weighs appro ximately 5 kg. Be careful when handling the PSM to prev ent
damage to the equipment and personal injury .
Remove all the PSMs from the slots of the –48 V DC PSM shelf .
Grasp the handle on the front panel of the PSM with one hand. Slowly pull the PSM out of
the shelf slot while carefully supporting the bottom of the module with the other hand.
5
Remove the filler panels (if used) from the slots of the –48 V DC PSM shelf . Using a T25
TORX bit and driver , loosen the captive retaining thumbscrew on the filler panel until it is
disengaged from the shelf .
Y ou will be disconnecting multiple cables from connectors. If necessary , use
masking tape and a marker and temporarily tag each cable as to the proper
connector before disconnection.
6
Disconnect the +27 V DC output power cable on the rear of the PSM shelf from the +27 V
DC input power cable on the rear of the PDU by separating the orange connectors.
7
Disconnect the –48 V DC input power cable from the rear of the –48 V DC PSM shelf by
separating the blue connectors.
8
Disconnect all of the cables connected to the –48 V DC PSM shelf front panel connectors.
9
Loosen the two rack mounting screws in the keyhole slots of the –48 V DC PSM shelf rack
mounting flanges. Do not remove these two screws. Leave the screw heads extending 8 mm
out from the rack surface. These two screws will serve as hanger screws.
10
Completely loosen and remove the remaining rack mounting screws in the –48 V DC PSM
shelf rack mounting flanges.
1 1
Grasp the –48 V DC PSM shelf and lift it up and off of the hanger screws. Pull the –48 V DC
PSM shelf out of the rack and set it out of the way .
Procedure 10 -2 Installing the replacement –48 V DC PSM shelf
A T THE BTS SITE
1
Properly position the replacement –48 V DC PSM shelf in the rack location.
Align the keyhole slots of the PSM shelf rack mounting flanges with the two hanger screws
and hang the shelf on the rack.
2
Insert screws in the 6 open slots of the PSM shelf rack mounting flanges.
Tighten all 8 PSM shelf rack mounting screws to 4.77 N-m (42 in-lb).
Continued
10 -6 68P09283A64 -3
FOA SEP 2007