Hybrid Ultra
855-350-050_Rev2.0_Instruction Manual
Page
13
of 84
2.
Verify the polarity of the BMMD installed in the unit by noting the
label under the rear BMMD BAT bus bar input. "BAT +" indicates a
positive battery voltage system with the LVD contactor and battery
breaker internally connecting this terminal to the system "+" output,
while "BAT –" indicates a negative battery voltage system, with the
LVD contactor and battery breaker internally connecting this
terminal to the system "−" output (see Figure 7 and Figure 8).
Figure 7. The BMMD Output Bus Bars
Figure 8. The BMMDP Output Bus
Bars
NOTE: Use wire and connectors appropriately rated for the highest possible
system current when making connections to the battery, BMM, and
power chassis.
3.
Connect the battery hot lead (see comment on polarity above) to
the BMMD BAT bus bar, and the battery return lead to the main
system output bus bar of the corresponding polarity (i.e., a positive
voltage system will have the battery (+) tied to the BMMD terminal,
with the battery (−) tied to the main NEG output busbar; a negative
voltage system will have the battery (−) tied to the BMMD terminal,
with the battery (+) tied to the main POS output busbar). Install an
appropriate in-line DC overcurrent protection device, such as a fuse
or circuit breaker on the battery hot lead.
Table 11. Available BMMD Models
−V BAT
+V BAT
Description
Connections
BMMD
BMMDP
Dual 100 A battery breakers to connect
two identical battery strings through an
LVD and current sensor with advanced
battery management capability for the
combined battery
BAT 1 and BAT 2
input bus bars (both
or
− polarity)