DANA TM4 SUMO MD MV, Руководство по устранению неисправностей

Страница: 139 / 182

139
Service Codes
TT32: Motor Speed reached Maximum
Description
The Troubleshooting Tree 32 indicates an error where
the motor speed reached the maximum speed, in
either direction, which cause the system to go into the
defective state.
The maximum speed for the motor depends on your
system application. With ODIN tool check the value of
the forward and backward max speed and compare
them to your specific system specifications or the
preset values from the Operation and Maintenance
guide.
The maximum speed limit might be reach while the
truck was in a downhill. It is possible the driver uses
the mechanical brakes to slow down the vehicle.
The motor sensor cable or the motor sensor
connector on the MCU or the motor might cause the
issue.
The MCU and/or the motor resolver themselves may
be defective.
Note: If the MCU goes in failure, it will capture a
BlackBox upon the high voltage battery reached the
high limit error. The BlackBox can then be consulted
via ODIN tool to see if the angle waveform (saw tooth)
is straight on each rise and fall edges.
Note: Note on the maximum speed parameters
By default, the maximum speed parameters
(Motor.SpdFwdMax and Motor.SpdBwdMax) are set
to the maximum speed the system can achieve. They
can be set to lower values by the customer. The
maximum speed fault will therefore trigger when the
speed (forward or backward) reach the parameter
setting (forward or backward).
Note : Refer to the Operation and Maintenance guide
for more details on the speed parameters settings.
Note : Refer to the System Specification document for
more details on Overspeed range limit.
Note: on maximum speed reached
It is possible to reach maximum speed limit regardless
of the speed derating in the case the vehicle is going
down a downhill slope and the mechanical brake are
not used to slow down the vehicle
.
In this case, it is
imperative that the driver act on the mechanical brakes
to slow down the vehicle
.
The back EMF at speeds
higher than the overspeed range of the system could
potentially damage the MCU.
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
Defective 0x3210 0x3211
The motor speed
reached its limit in
forward or backward
direction and caused the
system to go in a failure
state
1.
Motor speed is too high - Torque derated
but something else preventing the speed
to reduce.
2.
MCU speed setting parameters wrongly
configured (start, end and speed limit
derating in forward or backward direction).
3.
Defective MCU.
4.
Defective motor resolver.