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Centralized Architecture (Continued)
Remote Voltage Sense and System Shunt for Millennium II Controller when in a
Cabinet with BLJ/BIC9 Bay Board
These procedures convert the Millennium II Controller to external battery sense (voltage sense at the
central charge and discharge buses) and a single system shunt for load current, when used in a Cabinet
with a BLJ/BIC9 Bay Board.
Refer to Figure 6 - 2 for these procedures.
Remote Voltage Sense and System Shunt for Millennium II Controller when in a Cabinet with BLJ/BIC9 Bay Board
Step
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.
If central bus bars have LVBD, sense leads must be on the rectifier side of the contactor.
Note:
Step
1
Run new wires (installer-provided) from the system shunt to connection points M1 (SH-, violet wire) and M2 (SH+,
white wire) 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.
Caution: Remove the Violet and White wires from M1 and M2. Splice directly to the leads coming from the shunt.
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.
BLJ Board
Millennium II
Page 38
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System Shunt for Millennium II Controller with BLJ/BIC9 Bay Board
Violet and White Wires on
Terminals M1 and M2
Original Path of Slate and
Black Voltage Sense Wires
(dashed line)
Figure 6 - 2: System Shunt and Remote Voltage Sense for
Millennium II Controller in Cabinet with BLJ/BIC9 Bay Board
Action
Action
To System Shunt
To System Bus Bars
Butt Splice
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