DANA SPICER TM4 SUMO HP HV Powertrain, Руководство по устранению неисправностей

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116
Service Codes
TT27
Description
The Troubleshooting Tree 27 indicates an error where
the IGBT short circuit mechanism was activated, in
reaction to another event.
Other error caused the MCU defective while operating
at a high speed, (back Electro-mechanical Feedback
is too high to maintain DC bus under the high voltage
limit).
MCU must have been commanded to shut down by
the VMU /ECU (via CAN bus) while the vehicle was
beyond
the “unsafe speed”.
Refer the
Troubleshooting Guide of the VMU /ECU for
investigation of the causes.
Note: Back EMF Motor reduction mechanism
Any error event raised by the system while the motor
speed is beyond the "unsafe speed" will activate the
phase short circuit mechanism through the MCU
power switch modules. This mechanism is activated
to maintain the DC bus under the high voltage
maximum limit until the motor speed is reduced under
the « unsafe speed ».
At the time the motor phases are short circuited, it is
normal that the phase currents and potentially the
input DC current will temporarily exceed the limits and
raise these errors type.
Other error(s) must be investigated.
Note : Refer to the Application note High-Speed fault
Management Document.
To correctly diagnose the faulty system, connect the
Diagnostic Tool (see «Diagnostics» section for test
equipment and descriptions) and follow the
Troubleshooting Tree procedure below.
See “Safety Warnings” and “Troubleshooting Tips”
sections for general guidelines on system diagnostics.
System Mode Referred by SysFile ID Condition Possible Causes
Operational
0x3113
The IGBT short
circuit mechanism
has been activated.
This event is
activated under high
speed condition upon
any error event.
1.
Other error causes the system to go in
failure state while in high speed (back EMF
too high to maintain DC bus under the high
voltage limit).