Vertiv
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+24 VDC Power System User Manual (Section 6013)
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Rev. G
137
Table 7:
MCA Advanced Settings
ADVANCED SETTINGS
Setting
Factory
Default Setting
MCA Config.
534876, 534878,
and 534879
Factory
Default Setting
MCA Config.
534877
Required
Site Setting
Alternating Display Feature
Disabled
Disabled
Rectifier Module Fan
Speed Control Feature
Disabled
Disabled
MCA Audible Alarm
Cutoff Reset Time Period
15 Minutes
15 Minutes
Manually Initiated Timed
Test/Equalize Feature
1 Hour
1 Hour
Automatic Test/Equalize Feature
Disabled
Disabled
Alarm Relay Test Feature
45 Seconds
45 Seconds
Powering Down the MCA
NOTE!
as this procedure is performed.
1.
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.
2.
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.
WARNING!
Damage to the MCA may result if the next step is not followed.
3.
Connect an approved grounding strap to your wrist. Attach the other end to a suitable ground.
NOTE!
If distribution Row A (bottom row) in the Distribution Cabinet is equipped with a GJ/218 type
circuit breaker in the bottom mounting position, it may be necessary to turn off and remove the circuit
breaker to access connector J15 in the next step. If so, reinstall and turn on the circuit breaker after
completing all MCA replacement procedures.
4.
Disconnect the locking-type plug from connector J15 at the rear of the MCA Main Controller circuit card.
This removes input power to the MCA.
5.
With an external voltmeter, verify plant voltage is correct (MCA is powered down at this point).