Grounding And Fusing - Nuvation Energy NUV300-BC-12 Product Manual

4.2.3. Grounding and Fusing

The Low-Voltage BMS enables connection to a series-connected stack of monitored cells up to a total
voltage of 60 V DC. The lowest potential (the negative end) of the connected stack also serves as the
common return for the contactor coils as well as the reference for the Low-Voltage BMS internal
circuitry and power supply. Any connection to earth or chassis ground must be made outside of the
Low-Voltage BMS.

The contactor coils return to the same potential as the most negative end of the
attached stack regardless of whether this point is connected to ground.
An earth or chassis ground connection may be made to any single point in the connected cell stack as
required by the application. The cell stack may also be left isolated from earth or chassis. Fusing of
the cell stack where it connects to provide operating power to the Low-Voltage BMS is required
externally.
Figure 7. Connection example for powering the Low-Voltage BMS from cells
If the load side of the current shunt is grounded
▪
A fuse is required at the negative power connection point only, in line with the connection to
pin 6 of the Contactors / -V Power connector
▪
Connect pin 6 of the
stack
▪
Connect pin 1 of the
current shunt, or to ground
Document ID: NE-PM-002
Contactors / -V Power connector
Current Shunt / +V Power connector
Nuvation Energy Low-Voltage BMS - Product Manual
through a fuse to the negative end of the
directly to the load side of the
13 Rev 1.2, 2021-03-03
Curie Update 1