User manual

66 Maintenance
UM6C28C P0728920 Standard 11.00 April 2001 Emerson Energy Systems
Replace the LVD contactor as described in the following procedure. Refer
to Figures 24 and 25.
Procedure 10 – Replacing the LVD contactor
Step Action
1 Notify the Alarm Center of the possibility of incoming alarms during
the execution of this procedure.
2 Open the front door and remove the top panel of the control and
distribution panel.
3 Install a size 1/0 AWG jumper cable between the negative charge
busbar and the negative discharge busbar in such a way as to bridge
out the LVD contactor ( see Figure 24 ).
4 Disconnect the two control wires from the coil of the contactor.
5 Remove the two nuts connecting the contactor to the busbars.
6 Remove the three mounting nuts securing the contactor to the
cabinet.
7 Carefully remove the contactor from the control and distribution panel.
8 Carefully install the new contactor in the space vacated by the old
contactor.
9 Secure the contactor to the cabinet with the three mounting nuts
removed in step 6.
10 Connect the contactor to the busbars with the two nuts removed in
step 5.
11 Reconnect the two control wires on the coil of the contactor.
12 If the new contactor was not provided with a diode across the two
center terminals of the coil, remove the diode on the old contactor and
reinstall it on the new contactor observing the polarity (direction of
arrow).
13 Reinstall the top cover and close the front door of the control and
distribution panel.
14 Notify the alarm center at the completion of the procedure.
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