Nuvation Energy High-Voltage BMS, Installation Manual, Page: 36 / 46

Table 29. External Power Connector Pin Assignment
Pin Connection Description Connected to Device
1 PWR_A External Power Supply Input External Power Supply
2 PWR_B External Power Supply Input External Power Supply
5.3.4. Stack Bus
The Stack Bus connector provides power and communication to the Stack Controller module. The
Stack Bus provides 42 mA to the Stack Controller plus the summation of current consumed by all Cell
Interface modules in the system (up to 25 mA per Cell Interface - 12 channel or 31 mA per Cell
Interface - 16 channel). 120 Ω termination must be added by connecting pins 1 and 3 together with a
short length of wire.
Connect the Stack Controller to this connector.
Table 30. Stack Bus: Molex MiniFit Jr Connector
Molex 39-01-2065
Manufacturer Molex Incorporated
Housing 39-01-2065
Housing material Nylon UL94V-0
Circuits 6
Crimp terminal 39-00-0181
Wire gauge range AWG18-24 stranded
Table 31. Stack Bus Connector Pin Assignment
Pin Connection Description Connected to Device
1 TERM1 Termination Resistor; Short to Pin 4 to add
120
Ω bus termination
Stack Bus Connector
2 STACKBUS_N Stack bus differential pair negative Stack Controller
3 +VSYS +24V Power Supply Stack Controller
4 TERM2 Termination Resistor; Short to Pin 1 to add
120
Ω bus termination
Stack Bus Connector
5 STACKBUS_P Stack bus differential pair positive Stack Controller
6 COM Power return from Power Interface Stack Controller
Nuvation Energy High-Voltage BMS - Installation Guide
Document ID: NE-IG-001 33 Rev 2.1, 2020-03-13