Emerson 710NPBA Replacing a Battery or Load Disconnect Contactor, Restarting the Power System

User Instructions	UM581127000
Spec. No. 581127000 (Model 710NPBA)	Issue AB, March 22, 2012

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 4-17, Figure 4-18, Figure 4-19,or Figure 4-20as 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 4-17, Figure 4-18, Figure 4-19,or Figure 4-20for hardware build-up and recommended torque.

3)Replace the wiring to the contactor by plugging-in the quick disconnects. Refer to Figure 4-17, Figure 4-18, Figure 4-19,or Figure 4-20.

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 (IM581127000) for a startup procedure.

3)Verify no alarms are active.

Chapter 4. Troubleshooting and Repair Page 47

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