GE Industrial Solutions Galaxy Power Systems - Manual (Page 72)

Installation Guide for Galaxy Power Systems
6 - 4 Centralized or Distributed Architecture Connections Issue 12 August 2012
Centralized Architecture, continued
Remote Voltage
Sense and System
Shunt 
for Galaxy
Millennium
Controller
These procedures convert the Galaxy Millennium 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 6-2 for these procedures. 
Remote Voltage Sense for Galaxy Millennium Controller
Step Action
1 Cut the regulation wires that run from the controller to the rear bus
bars in the cabinet (RB and RG, Slate and Black wires, respectively).
2 Remove and discard the ends of the wires that run to the cabinet bus
bars.
3 Run new wires from the central bus bars; butt splice to the cut wires
that remain connected to the controller.


Note: If central bus bars have LVBD, sense leads must be on the
rectifier side of the contactor.
System Shunt for Galaxy Millennium Controller
Step Action
1 Run new wires (installer-provided) from the system shunt to
connection points M1 (SH-) and M2 (SH+) 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 M1 and M2. 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.
Caution: Do not remove the Violet and White wires that are already
connected to M1 and M2 from the controller. Adding the external
shunt wiring to these same M1 and M2 points completes the
connection from the shunt to the controller.
2 If the system shunt is located in the “hot” or ungrounded side of the
chandelier, it will also be necessary to move the BL lead designated
“CG” (T83314-30 Figure 3F) of the Millennium Power/Sense P6-9
cable set off its default termination on the return bus at the top of the
cabinet, to the hot bus instead.