Emerson 721NPBB Manuel D’Utilisation

UM582127000

User Instructions

Issue AC, January 2, 2013

Spec. No. 582127000 (Model 721

NPBB

)

Page 56

Chapter 4. Troubleshooting and Repair

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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.

Replacing a Battery or Load Disconnect Contactor

Danger: All sources of AC and DC power must be completely disconnected from

this power system before performing this procedure. Use a voltmeter to
verify no DC voltage is present on the system busbars before proceeding.

Note: In the following procedure, before making busbar-to-busbar connections, apply a

thin coating of electrical anti-oxidizing compound to the mating surfaces of the
busbars.

Procedure

Note: Refer to Figure 4-18, Figure 4-19, Figure 4-20, or Figure 4-21 as this

procedure is performed.

Removing the Contactor

1) Verify all AC and DC power sources are disconnected from the power system.

2) For the 1-row distribution cabinet, the contactor can be accessed from the top

of the distribution cabinet. For the 2, 3, or 4-row distribution cabinet, the
contactor can be accessed from the rear (and top) of the distribution cabinet.

3) For the 2, 3, or 4-row distribution cabinet, remove the

distribution cabinet’s

rear access panel(s).

4) Disconnect the wiring to the contactor by unplugging the quick disconnects.

5) Note the orientation of the contactor to ensure the replacement is installed the

same way. Unbolt the contactor (4-places) and remove. Save all hardware.

Installing the Replacement Contactor

1) Position the replacement contactor oriented the same way as the old.

2) Secure the contactor with the hardware removed above. Refer to Figure 4-18,

Figure 4-19, Figure 4-20, or Figure 4-21 for hardware build-up and recommended
torque.

3) Replace the wiring to the contactor by plugging-in the quick disconnects. Refer

to Figure 4-18, Figure 4-19, Figure 4-20, or Figure 4-21.

4) For the 2, 3, or 4-row distribution cabinet, replace the

distribution cabinet’s rear

access panel(s).

Restarting the Power System

1) Reconnect the AC and DC power sources to the power system.

2) Start the power system. Refer to the separate Installation Instructions

(IM582127000) for a startup procedure.

3) Verify no alarms are active.