GE Industrial Solutions Off Line Equalization (OLE) - Manual (Page 29)

Off Line Equalization Panel and Converter for GPS4848/GPS4812
Issue 4 January 2008 Off Line Equalization Operation 6 - 5
Partially Discharged Batteries
Guidelines If the battery string voltage is less than the plant float voltage (V
f
) the
equalization process will not start. In this situation, the converter will
attempt to raise the voltage to V
f
using the built-in “trickle charge”
mode. In this mode the output current of the converter is limited to
approximately 3A for a period of about ten minutes. During trickle
charge mode it is normal for the Alarm LED (Red) to be lit, indicating
that the output voltage is outside the acceptable range.
If at the end of this 10-minute period the voltage is still lower than V
f
,
the converter will shut down and the On/Standby LED will alternate
(Yellow/Green), indicating low battery voltage. Also, the Alarm LED
(Red) will be on, indicating that the output voltage is out of the
acceptable range. If during the 10-minute trickle charge period the
battery voltage rises to V
f
, the converter will automatically switch to
normal Equalize mode and the Alarm LED will extinguish. (There may
be a delay of 20-30 seconds as the battery voltage rises above 56V
before the Alarm LED extinguishes.)