GE Industrial Solutions Galaxy Vector Controller GCM3 - Manual (Page 66)

Galaxy Vector Controller GCM2, GCM3
4 - 12 Installation and Configuration Issue 4 January 2008
When a test has been completed, the battery reserve time is
displayed in the form of hours and tenths of hours (hh.h).
Load current is displayed in the form of Amps without decimal
point (dddd). The load current is the current observed during the
test.
Battery Discharge
Test Enable
Two settings are available, Enable or Disable. Selecting Enable
allows the battery discharge test to be performed and selecting
Disable prevents the battery discharge test from being
performed. Press the
< Save softkey to save one of the two
settings. When the test is enabled, the battery test softkey will be
enabled. Otherwise, the battery test softkey is disabled.
Shunt Type/Size The Vector provides three separate methods and up to two
separate shunt signals for use in determining the system current
to display. The access connections to the two shunt signals are
on the BLJ3 board SH1+/- and SH2+/- as shown in Figure 2-6,
or on the BTJ2/BTJ3 board J21 plug as shown in Table 2-M. The
shunts are rated for 50 mV and can be in the in the range of 0-
9999 amps.
The method used by the Vector to determine the display load
value is determined by the configuration of the Shunt Type. The
three choices for this parameter are “None”, “Load”, and
“Battery”.
None: Select “None” if no shunt is used or connected to the
BLJ3 or BTJ2/BTJ3 board. Selecting “None” results in
displaying the system load current as the sum of the individual
rectifier loads. This may not be the true “load” current in systems
with battery backup since it includes the portion of the rectifier
loads which is floating or recharging the batteries, and will show
a 0 amp load when the rectifiers are off and the batteries are
carrying the system load. Typically, this shunt type would be
used only in batteryless systems, where this is an accurate
depiction of system load.
Load: Selecting “Load” as the shunt type assumes that one or
both of the shunt signals received through the BLJ3 or
BTJ2/BTJ3 board is monitoring load current. When the shunts
are configured for “Load,” the displayed system load is the sum
of all active shunts. Battery float or charge current can be
determined by subtracting this load current from the sum of the