Vertiv | +24 VDC Power System User Manual (Section 6013) | Rev. G
8. Observe the value displayed. Press and hold the FUNCTION SET NO (-) pushbutton until "MANUAL
RECONNECT" is displayed. Release the pushbutton.
9. With "MANUAL RECONNECT" being displayed, press and release the FUNCTION SET ENTER
pushbutton.
10. “ARE YOU SURE? + -” is displayed. Press and release the FUNCTION SET YES (+) pushbutton. The
display stops flashing.
NOTE!
The reconnect 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.
11. Press and release the FUNCTION SET YES (+) and NO (-) pushbuttons simultaneously, to return to the
beginning of the MCA menu tree.
Battery Recharge Current Limit Feature
This feature can be enabled or disabled by a user via the MCA. The default state is disabled.
When
disabled, the battery recharge current limit setpoint equals the system current limit setpoint. When disabled,
the battery recharge current limit setpoint increases and decreases with the system current limit setpoint
through Rectifier Module installation, Rectifier Module removal, and manual intervention. If battery recharge
current limit is enabled, and the system current limit setpoint is lowered below the battery recharge current
limit setpoint; the battery recharge current limit feature is automatically disabled.
This feature requires battery current Shunt PODs to be installed in compatible Battery Stand(s) and connected
to the power system. The battery recharge current limit function depends on measurements supplied by the
system and by the battery current shunts. It is critical that the output current of all Rectifier Modules is
monitored either by battery current or system load shunts connected to the MCA via Shunt PODs.
Description
A Battery Recharge Current Limit value can be set. When set, the maximum current delivered to the batteries
is limited to this value. This value can be set from 10% of total system current capacity to the system current
limit setting (MCA prevents the user from adjusting this value above the system current limit setting).
When battery recharge current approaches the battery recharge current limit setting, the MCA automatically
adjusts the current limit circuit on each Rectifier Module so that this value is not exceeded. The MCA also
displays "BAT CHGCL #####A" in the measurement menu.
The MCA will not adjust Rectifier Module current limits to less than the actual measured system load current
plus half of the battery recharge current limit setpoint. The MCA will stop adjusting Rectifier Module current
limits when battery current falls to half of the battery recharge current limit setpoint or when adjusted Rectifier
Module current limits are greater than the actual Rectifier Module output currents by more than half of the
battery recharge current limit setpoint.
If a Rectifier Module fails, the MCA automatically resets each remaining Rectifier Modules current limit point to
maintain this value. The MCA also insures that the current limit circuit on any Rectifier Module is not set above
105% of its capacity.
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