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Vertiv
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+24 VDC Power System User Manual (Section 6013)
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Rev. G
163
Quad Shunt POD Circuit Card Replacement
One Quad Shunt POD Circuit Card, designated A3, (system distribution current monitoring) is located in each
Distribution Cabinet. If the Power System includes a subsystem, a second Shunt A/D circuit card, designated
A4, (subsystem distribution current monitoring) will also be mounted in the main Distribution Cabinet. To
replace either circuit card perform the following procedure.
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 document 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.
WARNING!
Damage to the circuit card may result if the next step is not followed.
4.
Connect an approved grounding strap to your wrist. Attach the other end to a suitable ground.
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.
5.
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.
6.
Remove the two screws that secure the front edge of the circuit card. Pull the circuit card forward out of
the edge connector at the back of the card, and remove from the cabinet.
7.
No adjustments are required on the replacement circuit card prior to installation.
8.
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.
9.
Remove the grounding wrist strap.