GE Industrial Solutions Galaxy Vector Controller GCM3 - Manual (Page 67)

Galaxy Vector Controller GCM2, GCM3
Issue 4 January 2008 Installation and Configuration 4 - 13
individual rectifier loads. The use of two separate shunt signals
allows loads to two distribution bays to be monitored separately.
If the current is displayed as “Err,” the system may contain a
battery shunt or may be improperly wired.
Battery: Placing one or both shunts in the charge/discharge path
of the system batteries and configuring the shunts as Battery
shunts results in a current display that is the calculated difference
of the sum of the individual rectifier currents and the sum of the
battery charge currents obtained from the shunt measurements.
This is the typical configuration used with most distributed
architecture systems and is accurate regardless of whether
system batteries are charging or discharging.
Shunt Size The shunts are assumed to have a voltage rating of 50mV. The
full scale load ratings are user configurable. Each shunt can be
configured from 1 to 9999 amps. A value of 0000 disables that
shunt reading.
System Float
Mode Settings
The following parameters are settings which are active anytime
the plant is in Float mode.
System Float Voltage Set-Point: This is the output voltage that
all system rectifiers will be set to while in Float mode. If Battery
Thermal Compensation is enabled and active, the actual system
voltage will be adjusted from Float Set Point based on the
highest battery temperature monitored by the Vector.
Rectifier Float Current Limit: Rectifier current limit can be
adjusted from 30 to 110% of rectifier capacity. This is the
current limit while the system is in Float mode.
High Float Voltage Major Alarm Threshold: System voltage
monitored above this threshold results in a High Voltage major
alarm and possible rectifier shutdown while in Float mode.
High Float Voltage Float Minor Alarm Threshold: System
voltage monitored above this threshold results in a High Float
Voltage minor alarm (no rectifier shutdown) while in Float
mode.
Battery on Discharge Float Major Alarm Threshold: System
voltage monitored below this threshold results in a Battery
Discharge major alarm while in Float or Boost mode.