VANNER
Incorporated
OWNER’S MANUAL
Vanner High Voltage Distribution Module OWNER’S MANUAL
8
CAN and I/O Definitions and Functionality
1. +24V Input
The +24V input powers the HVDM control board. The input shall come from the most convenient
termination point that is on the secondary side of the house battery main disconnect switch.
2. Ignition Signal
The ignition signal "wakes" the HVDM up. It may be +12V or +24V.
3. CAN Shield
This connection is used to make the shield on the CAN cable common. This is required for
electrical noise considerations in vehicle electrical systems.
4. CAN Low
This is the low signal connection for
the vehicle’s CAN bus. The HVDM will communicate faults
to the vehicle’s electrical system controller via the CAN bus.
5. CAN High
This is the high s
ignal connection for the vehicle’s CAN bus. The HVDM will communicate faults
to the vehicle’s electrical system controller via the CAN bus.
6. Spare
7. Command/Hardware Enable Signal
This is an active low signal that comes from the TCM (Transmission Control Module) of the hybrid
drive system. Reference Allison Transmission's Technical Document 192 for circuit requirements
for this input.
8. Ground
The ground input powers the HVDM control board. The input shall come from the most
convenient termination point tied to battery negative. Do not terminate to vehicle chassis.
