5.3.2. Interlock
The Interlock connector provides a means to set the high-current contactor behavior, as outlined in
the table below. Using a physical switch/relay instead of a jumper is a convenient way to implement
an interlock switch that de-energizes the system contactors. It is recommended to connect pins 2 and
3 as this will enable the hardware redundant fault signaling feature to de-energize system contactors
in the event of a Power Interface failure.
Table 25. Interlock Options
Interlock Connection
Function
1 & 3
2 & 3
open
open
System contactors are de-energized
open
closed
System contactors are controlled by Nuvation Energy
BMS software, but de-energized if hardware-based
fault signaling detects a fault
closed
either open or closed
System contactors are controlled by Nuvation Energy
BMS software; hardware-based fault signaling
mechanism will not de-energize system contactors
Pin 3 is electrically connected to chassis ground
Connect a jumper or external interlock switch to this connector.
Table 26. Interlock: Molex Micro-Fit Connector
Molex 43645-0300
Manufacturer
Molex Incorporated
Housing
43645-0300
Housing material
Nylon UL94V-0
Circuits
3
Crimp terminal
43030-0002
Wire gauge range
AWG20-24 stranded
Nuvation Energy High-Voltage BMS - Installation Guide
Document ID: NE-IG-001
31
Rev 2.1, 2020-03-13