Installation Instructions

220 V AC P ower Supply Module (PSM) Shelf Chapter 10: PSM Shelf R eplacement Procedures

Procedure 10 -3 R emo ving the failed 220 V AC PSM shelf (Continued)

Using TORX T25 driver , completely loosen and remove the remaining rack mounting screws

in the 220 V AC PSM shelf rack mounting ﬂanges.

Grasp the 220 V AC PSM shelf and lift it up and off of the hanger screws. Pull the 220 V AC

PSM shelf out of the rack and set it out of the way .

Procedure 10 -4 Installing the replacement 220 V AC PSM shelf

A T THE BTS SITE

Using a TORX T20 bit and driver , remove the 4 screws securing the terminal block cover

box to the rear of the replacement 220 V AC PSM shelf . Remove the terminal block cover

box from the PSM shelf .

Make sure that the AC line terminal block on the replacement 220 V AC PSM shelf is properly

conﬁgured with insertion bridging. It should match that of the failed 220 V AC PSM shelf .

If necessary , use a ﬂat blade screwdriver to open terminals (turn screws CCW) for insertion

bridge placement. Place an insertion bridge into the proper terminals. While holding

the bridge with one hand, turn the corresponding terminal screws CW until the bridge

is securely clamped.

Properly position the replacement 220 V AC 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.

Insert screws in the 6 open slots of the PSM shelf rack mounting ﬂanges.

Using TORX T25 driver , tighten all 8 PSM shelf screws to 4.77 N-m (42 in-lb).

Reinstall all of the PSMs.

Properly orient each PSM and insert it into the appropriate PSM shelf slot.

Slowly slide the module into the shelf until the rear connectors are fully seated.

Make sure that the PSM is fully engaged with the shelf backplane slot connectors.

Using a T25 TORX bit and torque driver , tighten the captive retaining thumbscrews of

each PSM to 2.37 N-m (21 in-lb).

Reinstall ﬁller panels over any empty PSM slots of the 220 V AC PSM shelf .

Using a T25 TORX bit and driver , tighten the captive retaining thumbscrew on the ﬁller

panel to 2.37 N-m (21 in-lb).

Reconnect all applicable cables to the 220 V AC PSM shelf front panel connectors.

Connect the 220 V AC input lines to the proper terminals on the

rear of the 220 V AC PSM shelf by performing the following:

• Use a ﬂat blade screwdriver to open the terminals (turn screws CCW)

• Insert the appropriate wire into the terminal.

• While holding the wire with one hand, turn the corresponding terminal screw CW until

the wire is securely clamped. Tighten the terminal screw to 4.0 - 4.5 N-m (35 - 40 in-lb).

Continued

10 -14 68P09283A64 -3

FOA SEP 2007