GE Industrial Solutions CPS6000 - Manual (Page 196)

CPS6000 –48V Indoor/Outdoor Power Shelf
Issue 21 January 2008
196
When the alarm is issued, the Float Set-Point (fsp) and the Battery on Discharge (BoD)
threshold values are reduced by 1/24th. Once the alarm has been cleared by the CLE
command, the plant reverts to its normal fsp; however, the BoD threshold is maintained at the
new threshold for up to four minutes before reverting back to the old threshold. This is done
to ensure the batteries have had enough time to charge up to the nominal fsp and to prevent
any spurious BoD alarm conditions.
This feature may be used by customers as part of their overall battery maintenance program in
determining the health of battery strings. A voltage imbalance of 1.7V between half-string
voltages may mean a shorted-cell somewhere in the string. A service person should be sent
out to the site and determine if the string should be replaced.
Battery Recharge Current Limit
This feature must be enabled from the front panel. The battery recharge current limit feature
enables the QS840A controller to limit the recharge current flowing into a battery section
during the charge cycle. The recharge current flowing into the battery section can be limited
to any value between 5A and 100A.
Note that this feature will not have any impact on the current being delivered to the load.
Further, there will be no effect on the discharge current flowing from the battery strings to the
load during an ac fail condition. The controller will maintain the recharge current within 10%
of the set level.