Vertiv | +24 VDC Power System User Manual (Section 6013) | Rev. G
Adjusting System Current Limit
Local MCA Control Panel Adjustment Procedure
1. All controls are located on the MCA Interface Pad. Refer to Figure 1.
2. With "SYSTEM OK" being displayed on the MCA Interface Pad, press and release the FUNCTION SET
ENTER pushbutton.
or
With "## ALARMS ACTIVE" being displayed on the MCA Interface Pad, press and release the
FUNCTION SET ENTER pushbutton. Repeatedly press and release the FUNCTION SELECT DOWN
arrow pushbutton until "FUNCTION MENU" is displayed. Press and release the FUNCTION SET ENTER
pushbutton.
3. Repeatedly press and release the FUNCTION SELECT DOWN arrow pushbutton until "ADJUSTMENT
MENU" is displayed.
4. Press and release the FUNCTION SET ENTER pushbutton.
5. "ADJUST SYSTEM" is displayed.
6. Press and release the FUNCTION SET ENTER pushbutton.
7. Repeatedly press and release the FUNCTION SELECT DOWN arrow pushbutton until "CURR LIM =
####A" is displayed.
8. Press and release the ALARM CUTOFF and FUNCTION SET ENTER pushbuttons simultaneously. The
"CURR LIM =" portion of the display flashes.
9. Observe the value displayed. This is the system current limit setting. Each Rectifier Module’s current
limit circuit will be automatically adjusted to ensure that system current does not exceed this value. To
change this value, press and hold the FUNCTION SET YES (+) or NO (-) pushbutton. Release the
pushbutton when the desired value is displayed.
NOTE!
"CURRLIM = ####MAX indicates the sum of the maximum capabilities of all Rectifier Modules
installed in the system.
10. With the desired current limiting value being displayed, press and release the FUNCTION SET ENTER
pushbutton.
11. “ARE YOU SURE? + -” is displayed. Press and release the FUNCTION SET YES (+) pushbutton. The
display stops flashing.
NOTE!
The system current limit value will not be changed and the adjustment mode will be exited if the
FUNCTION SET YES (+) pushbutton is not pressed within 10 seconds of the “ARE YOU SURE? + -”
prompt.
12. Press and release the FUNCTION SET YES (+) and NO (-) pushbuttons simultaneously, to return to the
beginning of the MCA menu tree.
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