ELECTRONIC SPEED CONTROL
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
63
Repair and Service Manual
699327
ELECTRONIC SPEED CONTROL
PERFORMANCE
NOTICE: The vehicle will operate only when the key-
switch is in the ON position. The vehicle’s top
speed is sensed and regulated directly by the con-
troller and the feature to slow the vehicle when the
accelerator pedal is up is mild.
Speed Control
To prevent the possibility of loss of
control that could cause severe
injury or death, use the service
brake to control the speed. The speed control
system is not a substitute for the service brake.
Speed control system vehicles are equipped with a
regenerative motor control system.
Example: If all of the following events occur:
•
the vehicle is being driven down a slope
•
the vehicle attempts to exceed the specified top
speed with the accelerator pedal pressed
or
released
the regenerative brake will limit the speed of the vehicle
to the specified top speed but the warning beeper will
not
activate. When the regenerative braking system is
activated by this sequence of occurrences, the motor
generates power which is returned to the batteries.
If the operator attempts to override the electronic brake
by moving the key switch to another position, the vehi-
cle will slow
rapidly
until it reaches the speed of
approximately 2 mph (3 kph).
Pedal-Up Braking
Pedal-up braking is regenerative braking that occurs
when the accelerator pedal is released while the vehicle
is moving.
Example: If all of the following events occur:
•
the vehicle is being driven down a slope
•
the accelerator pedal is released
the pedal-up braking decreases speed until the vehicle
stops or the accelerator pedal is applied.The warning
beeper will
not
activate. When pedal-up braking is acti-
vated by this sequence of occurrences, the motor gen-
erates power which is returned to the batteries.
Walk-Away Feature
Walk-Away limits the movement of the vehicle without
driver input, decreases vehicle speed to 2 mph (3 kph),
and activates an alarm.
Example: If all of the following events occur:
•
the vehicle is stopped for more than 2 seconds
•
the accelerator pedal is released for more than
one second
•
the vehicle begins to move at more than 2 mph
(3 kph)
the Walk-Away feature limits the speed to approxi-
mately 2 mph (3 kph) and the warning beeper activates.
When the accelerator pedal is pressed, the walk-away
feature and warning beeper stops and normal vehicle
operation continues.
Anti-Roll Back Feature
Anti-Roll Back, like Walk-Away, limits reverse motion of
the vehicle down a slope to less than 2 mph (3 kph).
See ‘Walk-Away Feature’ above. An alarm will not be
activated should the Anti-Roll Back feature engage.
Anti-Stall Feature
Anti-Stall protection prevents motor damage if the vehi-
cle is stalled against an object or on a hill.
Example: If all of the following events occur:
•
the system senses that the accelerator pedal is
pressed (power applied to motor)
•
the motor is stopped long enough that additional
time can cause damage to the motor.
the Anti-Stall feature will interrupt power to the motor.
This brief interruption will permit the vehicle to roll back-
wards slightly before again stopping in the stalled condi-
tion. To restore power to the motor, power cycle the
keyswitch to the OFF position and back to the ON posi-
tion.
High Pedal Disable Feature
High pedal disable prevents acceleration of the vehicle
if the key switch is in the ON position while the acceler-
ator pedal is pressed.
Diagnostic Mode Feature
Diagnostic Mode helps with fault testing.
With some electrical system failures, the Diagnostic
Mode feature defaults to a mode that allows the vehicle
to operate at a decreased speed.
This feature allows the vehicle to be driven back to the
storage facility for problem diagnosis.
The technician can put the controller in diagnostic mode
and the controller will report the likely failure.
PRELIMINARY