DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

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7
General Information
Key Features
Dana TM4 Motor Control Unit (MCU)
The Motor Control Unit (MCU) system is operated via
CAN message communication between the MCU and
the Vehicle Management Unit (VMU) or Electronic
Control Unit (ECU).
The VMU or ECU is in charge of the user interface
and also interfaces with the Battery Management
System (BMS) and all other systems included in the
vehicle architecture.
The typical operation functions are:
•
Applying power to the system from the
auxiliary battery.
•
Asserting the enable signal to the MCU (VMU
/ECU or vehicle ignition).
•
Performing high-voltage battery pre-charge
(VMU/ECU or BMS).
•
Applying high-voltage battery voltage to the
system (BMS or BIM).
•
Transmitting CAN messages (VMU/ECU)
with the MCU:
o
Starting and stopping the system.
o
Applying a mechanical torque.
o
Safely shutting down the system.
o
Verifying operational status.
Hazardous Voltage Interlock Loop (HVIL)
The Hazardous Voltage Interlock Loop (HVIL) internal
loop is closed, resulting in a short circuit between its
two input pins. The HVIL signal is used to open the
high-voltage battery contactor when its internal loop is
opened during product maintenance or repair (e.g.
removal of the MCU cover (MCU with removable side
cover) or disconnection of motor sensor cable)
thereby protecting the user.
Diagnostics Capability and Troubleshooting
Troubleshooting can be performed with the TM4
ODIN tool. It gives the list of events that occurred
during the operation and categorized the events such
as:
•
Errors, which cause the product to cease
operation.
•
Warnings and Information level events are
also recorded and must be taken into
consideration even though the product will
remain operational.