PS
S5.0
5000
001
OE35
Version noT-code
F-code
Section
C-code
Electrical System with TX and TT Card
140
Service Manual
1997-10-23
4.9. Static Return to OFF
This built-in feature of the control is set up to make the driver
return the directional lever to neutral anytime he leaves the
vehicle and returns. If the foot pedal switch or key switch is
opened, the control will shut off and cannot be restarted until
directional lever is returned to neutral. A time delay of
approximately 1.5 seconds is built into the foot pedal switch
input to allow momentary opening of the foot pedal switch if a
bump is encountered.
4.10. Accelerator Volts Hold-OFF
This feature checks the voltage level at the accelerator input
whenever the key switch or foot pedal switch is activated. If
the voltage is less than 2.5 volts the control will not start. This
is to assure that the control is calling for low speed operation
at start-up.
4.11. Coil Driver Module
These drivers are internal to the logic card. They are the
power devices that operate forward, rearward, 1A, and power
steering contactor coils. These drivers open or close these
coils on command from the logic card. All modules are
equipped with reverse battery protection in that if the battery
is connected incorrectly, none of the contactors controlled
can be closed electrically.
4.12. 1A Thermal Hold-OFF
This feature prevents the 1A contactor from closing when the
truck is in severe thermal cutback to avoid torque jumps.
When the control goes into severe cutback, the must pulse to
time will inhibit the 1A timer.
4.13. Must Pulse to Time
This feature prevents the 1A timer from timing if the
oscillation pulse rate has not reached a particular level of
operation.
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