Vertiv
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+24 VDC Power System User Manual (Section 6013)
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Rev. G
169
Interconnect/LVD Inhibit Circuit Card Replacement
as this procedure is performed.
CAUTION!
When performing any step in this procedure that requires removal or installation of
hardware, use caution to ensure no hardware is dropped and left inside the cabinet; otherwise service
interruption or equipment damage may occur.
WARNING!
Circuit cards used in this equipment contain static-sensitive devices. Read the Static
Warning page at the front of this manual before performing the following procedure.
NOTE!
When performing any step in this procedure that requires removal of existing hardware, retain all
hardware for use in subsequent steps.
Procedure
1.
Observe the admonishments presented at the beginning of this section, and those encountered in this
procedure.
2.
Performing this procedure may activate external alarms. Do one of the following. If possible, disable
these alarms. If these alarms cannot be easily disabled, notify the appropriate personnel to disregard
any future alarms associated with this system.
3.
Open the Distribution Cabinet's front door by turning and holding the captive fastener in the
counterclockwise position.
DANGER!
Performing the next steps exposes service personnel to battery potential. Exercise extreme
caution not to inadvertently contact or have any tool inadvertently contact any energized electrical
termination.
4.
Remove the clear plastic panel that covers the circuit cards at the bottom of the cabinet. To do so,
loosen but do not remove the two screws that secure the cover. Slide the cover to the front until the
screw heads clear the keyhole slots in the cover. Then lift the cover out of the cabinet.
5.
Carefully identify the wires connected to external control terminal block TB1. These wires must be
connected to the same terminals on the replacement circuit card.
DANGER!
In the next step, control wiring may be energized from an external source. DO NOT allow
bare wire ends to contact any grounded or energized object.
6.
READ THIS ENTIRE STEP AND UNDERSTAND BEFORE PROCEEDING. Remove control wiring from
terminal block TB1. To do so, for each wire, insert a small flat-blade screwdriver into the square cavity
directly behind the wire. Depress the screwdriver until the wire is released and can be pulled out of the
terminal block. DO NOT allow bare wire end to contact any grounded or energized object. Isolate the
wire end with electrical tape. Repeat for each wire.
7.
Carefully identify the cables connected to connectors J1, J2, J8, J9 and J10. These cables must be
connected to the same connectors on the replacement circuit card.
8.
Disconnect the cables from connectors J1, J2, J8, J9 and J10.
9.
Disconnect the ribbon cable plug from connector J13. To do so, grasp the ejector tabs at each end of
the connector and pivot outward, forcing the plug out of the connector.
