Tyco Electronics Galaxy SC Controller J85501F-1
4 - 10 Configuration Issue 13 February 2001
change to the adjusted value. Instead, the actual voltage of the plant will
adjust by the difference between the value inputted and the level set in
Rectifier Manager. To verify that the adjustment has been made, make
the voltage reading at the plant jacks or batteries once again with a VOM
and compare to Galaxy’s displayed value.
ADJ PLI: This field, ADJ PLI, allows you to calibrate the plant current
to the desired level. For example, if the Galaxy SC shows that the plant
current is 297A, and your meter reads 300A, you can use this field to
adjust the controller plant current display to 300A to match your meter
reading. (Actually, what you read is the voltage across the shunt.
Knowing the shunt size, you can compute the current.) The reading
changes in steps of 1A, and the maximum total change is 10% of the
shunt size in either direction. The delta value entered will be used to
compute other reading plant current, using a linear equation with the
delta value as an offset. Use the <+> or <-> key to change the field value,
press <ENTER> to save it. The DEFAULT screen should show the new
plant current value (assuming that in the mean time the plant load has
not changed).
Note: This command should only be used with plants utilizing a LOAD
type shunt and centralized architecture. Be sure to verify the mV reading
and size of the load type shunt when calculating the plant load that is to
be displayed. To do this, first determine amps/mV by dividing the Shunt
I value by the Shunt mV value. For a 2000A/50mV shunt this results in
40amps/mV. Then multiply this value by the measured mV drop of the
load type shunt.
SHUNT TYPE: This selection allows the operator to configure the type
of shunt that is connected to the controller via the terminal block.
Possible values are LOAD, BATTERY, or NONE. the configuration is
determined by the plant architecture.
A shunt type of LOAD means that a load shunt is connected in a
centralized architecture. All of the plant load must be directed through
this single shunt. It is wired directly to the shunt terminations of TB1 on
the BJF card of the Galaxy. A load type shunt may be located on either
the “ground” side (preferred) or “hot” side of the plant output. The load
current displayed on the front panel is measured directly from the mV
signal across this shunt.
A shunt type of BATTERY means that a battery shunt is connected and
wired directly to the shunt terminations of TB1 on the BJF card of the
Galaxy. This shunt monitors only the charge or discharge current going
into or being provided by the battery it is monitoring. A battery type
shunt is used only in distributed architecture systems with a single
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