B
64
Repair and Service Manual
ELECTRONIC SPEED CONTROL
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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OPERATION
With the key switch in the OFF position:
•
the controller is deactivated
•
the electronic braking system is deactivated
allowing the vehicle to roll freely
•
the reverse warning beeper is deactivated
With the key switch in ON position:
•
the controller is activated
•
the electronic braking system and reverse warn-
ing beeper features are activated
NOTICE: 72 volt vehicles operate only with the key-
switch in the ON position.
If all of the following events occur with the keyswitch in
the ON position
•
the vehicle has been stopped for more than one
second
•
the accelerator pedal has been released for
more than one second
•
the vehicle begins to roll above 2 mph (3 kph)
the Walk-Away feature will limit speed to approximately
2 mph (3 kph) and the warning beeper activates. When
the accelerator pedal is pressed, the electronic braking
and warning beeper is overridden and normal vehicle
operation resumes.
To prevent the possibility of loss of
control that could cause severe
injury or death, always use the
service brake to control speed. The controller system
is not a substitute for the service brake.
If all of the following events occur with the key switch in
the ON position
•
the vehicle is being driven down a slope
•
the vehicle speed exceeds the designed speed
with the accelerator pedal pressed
or
released
the regenerative brake will limit the speed of the vehicle
to the designed speed range (the warning beeper will
not
sound). When the electronic braking system is acti-
vated by this sequence of events, the motor generates
power which is returned to the batteries. 72 volt models
are equipped with a regenerative motor control system.
The speed of the motor is sensed and regulated directly
by the controller. As a vehicle begins to accelerate while
descending a hill, the speed sensor will cause the motor
to electrically reduce the speed of the vehicle through
regenerative braking.
If the operator attempts to override the regenerative
brake feature by moving the direction selector or key
switch to another position, the warning beeper will sound
and the vehicle will brake
rapidly
until it reaches the
speed of approximately 2 mph (3 kph).
The system is a low power consumption unit but it will
drain the vehicle batteries over a period of time. If the
vehicle is to be stored for a prolonged period of time, the
controller should be disconnected from the batteries by
setting the key switch to the OFF position.
The Electronic Speed Control system consists of three
separate units, a pedal box, speed sensor, and control-
ler.
Pedal Box
The pedal box assembly is a modularized unit that con-
tains the accelerator pedal, return spring, and an
enclosed box that contains the pedal position micro
switch and a solid state Inductive Throttle Sensor (ITS)
that is activated by a moving plunger attached to the
accelerator pedal.
To access the pedal box:
1.
Remove the rocker panel.
2.
Lift the floor mat.
3.
Remove the access cover from the floor (Ref Fig. 1).
4.
The ITS and plunger are accessed by removing the
four screws and top cover from the enclosed pedal
box.
Fig. 1 Access to Pedal Box
Rocker Panel
Floor Mat
Access Cover
Pedal Box
PARK
Accelerator Pedal
PRELIMINARY
