GE Industrial Solutions Galaxy Vector Rack Mounted Controller J85501M-1 - Manual (Page 56)

Galaxy Rack-Mounted Vector Controller J85501M-1
4 - 10 Installation and Configuration Issue 2 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 J85501M-1 Vector provides two separate shunt signals for
use in determining the system current to display: SH1+/- and
SH2+/- on the BUJ1 board as shown in Figure 2-5. The shunts
must be rated for 50 mV and have a current rating of 0-9999
amps.
The method used by the Vector to determine the system 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 there is no central load shunt used in the
system or connected to the BUJ1 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.
Zero amps will be shown 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 the
system provides at least of the two shunt signals to the BUJ1
board. When the shunts are configured for “Load,” the displayed
system load is the sum of all active shunt values. Battery float or
charge current can be determined by subtracting the displayed
system load current from the sum of the individual rectifier
outputs. The use of two separate shunt signals allows loads to