GE Industrial Solutions Galaxy Verification - Manual (Page 39)

Galaxy Power System Verification Procedures
Issue 3 January 2008 Galaxy SC Controller Performance Verification Procedures 2 - 27
Battery Discharge Test
Overview The Battery Discharge Test feature dynamically tests the health of the
system’s batteries by controlling rectifier voltage to allow the batteries
to discharge into the plant load. A Bell Labs patented algorithm collects
battery information during the discharge and predicts the battery reserve
time. To initiate the test, the plant must be operating in the Float mode
with no active alarms and only serial type rectifiers connected. The test
is completed when approximately 20 percent of anticipated battery
capacity is removed. During the test, slope thermal compensation and
boost modes will be temporarily disabled. The controller Reserve Time
field will display “Test in Progress” and the BAT LED and the BD
external alarm relay will be activated. BD and Very Low Voltage alarm
thresholds will be temporarily inhibited.
It is a good practice to do a discharge test on the batteries, at least once
a year, or more frequently, if required.
Note: The Battery Discharge Test is for informational and planning
purposes only. It does not constitute the basis for warranty resolutions.
The battery test is aborted if any of the following conditions occur:
• 100 minutes elapses and 20 percent capacity has not been removed
• Battery voltage declines to the highest of the following computed
values:
– (1.75 x No. of cells) + 1.2 [48V] or + .6 [24V]
– Highest LVD disconnect threshold + 1.2 [48V] or + .6 [24V]
– Converter disconnect threshold + 1.2 [48V] or + .6 [24V]
– (Configured end cell voltage x No. of cells) + 1.2 [48V] or + .6
[24V]
• A voltage sense fuse operates
• A rectifier fail alarm occurs
• Any serial communication failure occurs
• Any power major alarm occurs