Remote voltage sense and system shunt, For galaxy vector controller, Centralized architecture, continued – GE Industrial Solutions Galaxy Power Systems User Manual
Page 74
Installation Guide for Galaxy Power Systems
6 - 6 Centralized or Distributed Architecture Connections
Issue 12 August 2012
Centralized Architecture, continued
Remote Voltage
Sense and System
Shunt
for Galaxy Vector
Controller
These procedures convert the Galaxy Vector Controller to external
battery sense (voltage sense at the central charge and discharge buses)
and a single system shunt for load current.
Refer to Figure 6-3 for these procedures.
Remote Voltage Sense for Galaxy Vector Controller
Step
Action
1
Remove the regulation wires that run from the BLJ terminals on the
controller (V1+ and V1-, Black and Slate wires) to the cabinet bus
bars.
2
Run new wires (installer provided, 22-gauge maximum with 3A
in-line fuses required) from the central bus bars to the BLJ
terminals (V1+ and V1-).
Note: If central bus bars have LVBD, sense leads must be on the
rectifier side of the contactor.
System Shunt for Galaxy Vector Controller
Step
Action
1
Remove shunt wires that have been factory connected to the
BLJ terminals (SH1+ and SH1-, White and Black wires).
2
Retrieve current limiting resistors from the removed wireset.
3
Placing resistors near the shunt, connect a resistor to each of
the shunt sense terminals.
4
Run new wires (installer-provided) from the system shunt to
connection points SH1+ and SH1- on the BLJ termination
board. Limit the resistance of this wiring to 1 ohm maximum.
Typically, this may be accomplished with 22 AWG conductors
25 ft long (1-way) or 20 AWG conductors 45 ft long (1-way).
If the cabling distance to the shunt exceeds these lengths, then
12 AWG conductors may be used and spliced down to 22
AWG within the wiring gutter above the BLJ card to permit
termination onto the insulation displacement terminals of
SH1+ and SH1-. Note: For -48V systems, the SH-
connection is to the load side of the shunt (if it is in the
return path), and the SH+ connection is to the battery/
rectifier side of the shunt. For +24V systems, these leads
are reversed.