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Vertiv
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+24 VDC Power System User Manual (Section 6013)
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Rev. G
161
9.
Set "Low Voltage Disconnect Circuit Card Identification Switches" S1-S4 on the replacement circuit card
to match the setting on the existing circuit card. You can refer to "Setting Wiring Options" in the
separate INSTALLATION INSTRUCTIONS (SECTION 6012) for details.
10.
Insert the replacement circuit card into the edge connector previously vacated. Fully seat the card in
the connector so that the mounting holes at the front of the card line up with the mounting posts
beneath. Install and tighten the two mounting screws at the front edge of the card.
11.
Remove the grounding wrist strap.
12.
Replace the fuses removed in step 6.
13.
Check the MCA for the presence of low voltage disconnect alarms. If alarms are active, use the MCA to
reconnect the low voltage disconnect circuits. DO NOT perform the next step until you verify that there
are NO Low Voltage Disconnect alarms active.
CAUTION!
If the next step is performed when low voltage disconnect alarms are active, battery and
system output will disconnect from the controlled load(s).
14.
Return the low voltage disconnect NOR/INH switch to the NOR position. The low voltage disconnect
INHIBIT indicator extinguishes.
15.
Reinstall the clear plastic cover in the bottom of the cabinet. To do so, place the cover on its two
mounting posts so that the mounting screw heads pass through the keyhole slots in the cover. Slide the
cover towards the rear. Tighten the two screws.
16.
Close the Distribution Cabinet's front door. The door can be shut without turning the captive fastener.
17.
Enable the external alarms, or notify appropriate personnel that this procedure is finished.
18.
Ensure that there are no local or remote alarms active on the system.