Current Shunt / +V Power (Connector J7) - Nuvation Energy NUV300-BC-12 Product Manual

4.2.8. Current Shunt / +V Power (Connector J7)

Figure 25. Current Shunt, +V Power cable (NUVW-B07Z03-005)
This interface is used to connect the current shunt to the Low-Voltage BMS. The positive operating
power is provided in a fused connection to this connector (see

This connection must only be made after all other connections to the Low-Voltage
BMS have been made.
Table 6. Current Shunt / +V Power Connector Pin Assignment
Pin Connection
1 +VPOWER
2 No Connect
3 No Connect
4 VSHUNT_LOAD
5 VSHUNT_BAT
6 VSHUNT_REF
The Low-Voltage BMS requires the shunt to be on the high side (positive end) of the battery stack.
The VSHUNT_REF signal is used to compensate for the voltage drop in the sense wires as well as to
provide the positive reference for measuring the overall voltage of the stack. VSHUNT_BAT and
VSHUNT_LOAD carry the differential voltage measurement from the shunt. VSHUNT_BAT must be closest to
the battery cells and VSHUNT_LOAD must be closest to the Stack Fuse so that the measured current has
the correct polarity. To minimize outside interference, twist VSHUNT_LOAD and VSHUNT_BAT together to
form a twisted pair, then run all 3 wires close together.
Document ID: NE-PM-002
Description
Main power supply input
Not Connected
Not Connected
Differential voltage input; Load side
Differential voltage input; Battery side
Voltage reference for voltage measurement
34
Nuvation Energy Low-Voltage BMS - Product Manual
Section 4.2.3).
Connected to Device
Positive end of the stack or other power
source
No Connect
No Connect
Load side of current shunt
Battery side of current shunt
Battery side of current shunt
Rev 1.2, 2021-03-03
Curie Update 1