GE Industrial Solutions Galaxy Vector Controller GCM3 - Manual (Page 51)

Galaxy Vector Controller GCM2, GCM3
Issue 4 January 2008 Operation 3 - 17
cell) for 72 hours, or 2.30 VPC for 48 hours. Do not exceed the
maximum voltage rating of any connected load.
Boost is typically not used with “sealed” or valve regulated
battery types. If it is used, it is generally completed at
significantly lower levels than that of flooded battery design to
avoid the build up of pressure and venting noted under the Float
mode section on Float Current Limit. When Boost mode is
disabled in the configuration menu, the feature cannot be
initiated.
Once enabled, Boost mode is entered by accessing the
operations menu and pressing the Boost softkey. The default
LCD screen shows that the system is in Boost mode of operation.
The present Boost duration is also displayed in hours. This Boost
duration can be edited with 0 and 24 hour minimum and
maximum values (0 = forever). Pressing the Step Boost mode
softkey returns the system to the Float mode. If a High Voltage,
High Float Voltage or RFA alarm occurs while in Boost mode,
the plant returns immediately to Float mode. AC Fail and Phase
Fail alarms does not affect Boost mode.
Boost mode has its own configuration parameters for Rectifier
Boost Current Limit, High Float Voltage Boost Threshold, and
High Voltage Boost Threshold, all of which control these
respective features and alarms whenever Boost mode is active.
Auto Timed Boost
The plant goes into Boost mode automatically if the following
conditions occur:
• Auto Boost is enabled
• Autoboost factor is configured from 1 to 9.
• A battery on discharge alarm occurs with AC Failure
alarms, or rectifier phase alarms occur for at least four
minutes.
When all rectifier phase and AC Failure alarms retire, the plant
automatically goes into boost mode.
The duration of the boost period is BD and AC Failure or Phase
alarm duration multiplied by the autoboost factor. The
maximum boost duration is limited to 24 hours.