Buhler 535 - Manual (Page 94)

435/485/535
3-65
If the machine is operating at the max gear limit
and the operator manually request a downshift,
the transmission controller will downshift the
transmission as long as the downshift will not cause
engine overspeed, even when the downshift point is
not satisfied .
Inching Pedal Calibration
To ensure the proper operation of the inching pedal
and to prevent false diagnostics at machine start-up,
an inching pedal calibration is required during the
initial factory startup of the machine .
In order to perform the inching pedal calibration, use
the following steps:
• Turn the key switch to “OFF” .
• Place shifter in Neutral and the inching pedal is in
the fully released position .
• Turn key to ON position and wait until the machine
display is running normally .
• Acknowledge and troubleshoot any faults that are
displayed (make sure no faults exist for the inching
pedal sensor and limit switch) .
• Without performing any other functions, depress
fully (and hold for minimum of  second) and
release fully the inching pedal four times in a row .
(Note that the limit switch must toggle with the
inching pedal firmly depressed) .
• Note any fault conditions on the machine display .
• By the fourth pedal press, a message should appear
on the display indicating a successful inching pedal
calibration . If a successful inching pedal calibration
does not show up on the display, check for
diagnostics on the inching pedal sensor and switch
and verify the sensor and switch are working
properly .
• If fault conditions exist involving the inching pedal
sensor or switch, follow troubleshooting guides
to resolve the fault conditions . Perform the inching
pedal calibration once the faults has been
resolved .
NOTE: The calibration can be performed whenever the
machine is powered up, but is not necessary every time
since the calibration values are stored into permanent
memory in the transmission ECM. The inching pedal
calibration is required if hardware adjustments or
replacements are made to the inching pedal assembly
items (pedal linkage, sensor, switch, etc.)
Diagnostic/Protection Mode
In the event that the transmission controls detect a
malfunction, an operator warning is generated while
action is taken to minimize damage to the machine .
The response strategy when a solenoid or machine
function error occurs is to keep the machine in the
current operating condition if possible .
If a fault occurs that prevents further operation in
the current gear, then the transmission will shift into
neutral immediately .
Advanced Default Mode (Limp Home/Default Mode)
If the transmission is shifted to neutral due to fault
conditions (either by the operator or the transmission
controller), further operation in gears up to F6 (if
available) will be allowed . Shifts out of Neutral up to
F6 can be initiated . If requested gear is not available
the highest available gear less than the requested gear
will be engaged .
If a short to battery fault occurs on clutches , 2, 3,
4, 8, or 9, and if the transmission shifts into Neutral
(either requested by operator or the transmission
controller), the transmission will remain in Neutral
until corrective action has been taken to clear the
fault . Default Mode cannot be initiated during these
clutch faults due to the lack of modulation profile
for the output clutches (lack of adequate lube for
modulation) .
NOTE: If a solenoid fault occurs in gears above F6,
the transmission will be allowed to maintain gears
above F6 if possible, but once shifted below F6 or
into Neutral, the F6 limit will apply.
NOTE: The Advanced Default Mode will be incorporated
in the software only. Loss of power to the ECM will
result in all solenoids de-energizing.
Section 3 - Operation
Transmission Operation