Installation Instructions

Section 5876 Installation Instructions
Issue AT, April 26, 2013 Spec. No. 582140000 (Models 802
NLDB, 802NLEB and 802NL-B)
Page 4-46 Chapter 4. Making Electrical Connections
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
AC Input Connections to Lists 2 and 12 Bays (with PDSC)
Each List 2 and 12 bays must be equipped with a List 30 or 31 PDSC. The PDSC
provides connections for one or two AC input branch circuits.
Ensure that each bay is wired into the PDSC as detailed in "Chapter 2. Placing the Bays
and Installing Internal/External Busbars".
Refer to Figure 4-16 or Figure 4-17 for lug landing locations.
Single AC Input Feed
The two AC input circuits in the PDSC are internally bussed together to provide a single
AC input for all 10 Rectifier mounting positions. This is the factory setting. The linking
busbars may easily be removed in the field to provide dual input circuits as described in
the next procedure. An AC input circuit breaker is provided for each Rectifier mounting
position.
1) Remove the rear upper cover panel from the PDSC. To do so: Loosen the four
screws that secure each cover panel. Lift the cover panel until the screw heads
clear the keyhole slots. Remove the cover panel.
Procedure
2) Refer to Figure 4-16 and locate the Rectifier AC input busbars. These busbars
are equipped with 3/8-16 studs on 1 inch centers. Attach Rectifier AC input leads
to these using customer supplied two-hole lugs and mounting hardware. When
lugs are secured using 3/8 inch hardware; recommended torque is 180 in-lbs
when a Belleville lock washer is used, and 300 in-lbs when a standard flat
washer and lock washer are used.
Connect Phase A to the terminal designated "A". Connect Phase B to the
terminal designated "B". Connect Phase C to the terminal designated "C".
Note that Rectifier mounting positions are numbered 1 through 10, starting at the
top of the bay.
3) Equipment grounding conductors must be provided with the AC input conductors
supplied to each bay. Connect to earth ground, not power system neutral.
Refer to Figure 4-16 and locate the Rectifier AC input frame ground nuts (3/8-16
nuts on 1 inch centers for securing lugs and lug mounting hardware). Attach
Rectifier AC input ground leads to these nuts using customer supplied two-hole
lugs. When lugs are secured using 3/8 inch hardware; recommended torque is
180 in-lbs when a Belleville lock washer is used, and 300 in-lbs when a standard
flat washer and lock washer are used.
4) Replace the rear upper cover panel to the PDSC. To do so: Place the keyhole
slots in the cover panel over the screws in the PDSC, slide the cover panel down
and secure by tightening the screws. Use the supplied grounding washers at the
top left and bottom right locations.