Cushman HAULER 800 2012 Technician's Repair And Service Manual page 83

ELECTRONIC SPEED CONTROL - HAULER 1000
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notices, Cautions, Dangers and Warnings.
48 VOLT SYSTEM VEHICLES
GENERAL
Performance options of the Precision Drive System
include:
• Anti-Roll back to limit backward motion of the
vehicle down an incline to less than 2 mph (3 kph)
• Walk-Away to limit vehicle movement without
driver input, slowing the vehicle to 2 mph (3 kph)
and sounding an audible alarm (reverse beeper)
• Anti-Stall protection to prevent commutator dam-
age from stalling the vehicle against an object or
on a hill
• High pedal disable to prevent undesired accelera-
tion if the direction selector lever is changed, or
the key is turned on while the accelerator is
depressed
• Diagnostic light indicator to ease troubleshooting
The two-position 'Run-Tow/Maintenance' switch is
located under the passenger seat (Ref. Fig. 14 on Page
F-17).
Switch
Fig. 14 Run-Tow/Maintenance Switch
OPERATION
With the switch in 'TOW/MAINTENANCE' position:
• the controller is deactivated
• the electronic braking system is deactivated
which allows the vehicle to be towed or roll freely
• the reverse warning beeper is deactivated
With the switch in 'RUN' position:
• the controller is activated
• the electronic braking system and reverse warn-
ing beeper features are activated
48 volt vehicles operate only in the 'RUN' position.
If all of the following events occur with the switch in
'RUN' position
a) the vehicle has been stopped for more than one
b) the accelerator pedal has been released for more
c) the vehicle begins to roll above 2 mph (3 kph)
the electronic braking will limit speed to approximately 2
mph (3 kph) and the warning beeper will sound. When
the accelerator pedal is depressed, the electronic brak-
ing and warning beeper will be overridden and normal
vehicle operation resumes. Any unusual situation
sensed by the 48 volt system will cause a similar
response. The system functions in all key switch posi-
tions.
The 48 volt system is not a substitute for the
service brake which should be used to control
speed and reduce possibility of injury.
If all of the following events occur with the switch in
'RUN' position
a) the vehicle is being driven down a slope
b) the vehicle speed exceeds the designed speed
the electronic braking 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. 48 volt models
are equipped with a regenerative motor control system.
The motor's speed 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 retard the speed of the vehicle through
regenerative braking.
If the operator attempts to override the electronic brak-
ing feature by moving the direction selector or key
switch to another position, the warning beeper will
Repair and Service Manual
NOTICE
second
than one second
with the accelerator pedal depressed or released
(except options equipped with compression brak-
ing)
Page F-17