UM582127000 User Instructions
Issue AC, January 2, 2013 Spec. No. 582127000 (Model 721NPBB)
Page 14 Chapter 3. Maintenance
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INSTALLING A FIELD EXPANSION RECTIFIER MODULE MOUNTING SHELF SPEC. NO. 588705000 Danger: Adhere to the “Important Safety Instructions” presented at the front of
this document.
Note: Refer to Figure 3-2 and Figure 3-3 as this procedure is perform ed.
Procedure
1) Install the expansion rectifier module mounting shelf directly below the bottom-
most rectifier module mounting shelf in the rack. Use the mounting hardware
provided in the expansion busbar kit.
Hardware build-up is: 12-24 x 3/4" screw and flat washer, (1) set per side.
12-24 x 3/4" screw and ground washer, (1) set per side.
Note: Install the ground washers so the teeth make contact with the met al on
the mounting angles. Torque all screws to 65 in-lbs.
2) On the rear of the expansion rectifier module mounting shelf and the existing
shelf installed directly above it, remove the rear shield that covers the output
busbars.
Note: Apply electrical anti-oxidizing compound to busbar mating surfaces bef ore
performing the next step.
3) Secure the existing shelf’s busbars to the expansion shelf’s mating busbars with
the supplied interconnect busbars and hardware.
Hardware build-up for these connections are:
1/4-20 x 1" bolt,
1/4" Belleville lock washer,
1/4" flat washer.
Install the Belleville lock washer so the concave side is towards the busbar.
Torque all connections to 60 in-lbs.
If installing a second expansion rectifier module mounting shelf, 1/4-20 nuts
(included) are required in lieu of the 1/4-20 x 1” bolts (see Figure 3-2).
4) Disconnect the cable coming from the distribution cabinet from the bottom
connector on the bottom-most existing rectifier shelf.
5) Connect the bottom connector on the bottom-most existing rectifier shelf to the
top connector on the expansion rectifier shelf.
6) Connect the cable disconnected in step 4) (coming from distribution cabinet) to
the bottom connector on expansion rectifier shelf.
7) Replace the rear covers removed in step 2) above.
8) Refer to the Power System Installation Instructions (IM582127000) and connect
AC input power to the expansion shelf.
9) Refer to the Rectifier Instructions and install rectifier modules into the expansion
shelf as required.