Emerson NetSure 721NPBB - Page 53

NetSure
™
-48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Spec. No: 582127000 Code: UM582127000
Model No: 721NPBB Issue AD, January 20, 2014
[45]
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 29, Figure 30, Figure 31, or Figure 32 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 29, Figure 30, Figure 31, or Figure 32 for
hardware build-up and recommended torque.
3. Replace the wiring to the contactor by plugging-in the
quick disconnects. Refer to Figure 29, Figure 30, Figure
31, or Figure 32.
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.
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