F
ELECTRONIC SPEED CONTROL (48V)
Page F-19
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notes, Cautions and Warnings
48 VOLT SYSTEM VEHICLES GENERAL
48 Volt vehicles are operated in one of four modes or
“performance options”. The option of the vehicle is deter-
mined by which performance plug is installed in the Elec-
tronic Speed Control Assembly. The options are defined
as follows:
1. The ‘No Plug’ performance option: The motor’s speed
is sensed and regulated to 13.5 mph (22 kph) directly
by the controller, the vehicle’s flat ground speed will
not change with different ground surfaces. The speed
sensor also allows for precise control of the downhill
vehicle speed during compression braking. Compres-
sion braking occurs when the throttle is released
while the vehicle is moving. The motor will electrically
retard the motion of the vehicle until the throttle is
depressed again or the vehicle stops. This is the
strongest of the two compression braking options. As
the vehicle crests a hill and begins to descend, the
speed will be smoothly regulated to 13.5 mph (22
kph). This option is enabled when there is a blank
plug installed.
2. The ‘Blue Plug’ performance option: This option
includes all of the driving features of the ‘No Plug’
option except that the compression braking feel is
milder.
3. The ‘Yellow Plug’ performance option: This option
includes all of the driving features of the ‘No Plug’
option, except the flat ground compression braking
speeds are 15 mph (24 kph) instead of 13.5 mph (22
kph).
4. The ‘Red Plug’ performance option: This option
includes all of the driving features of the ‘Blue Plug’
option except that the flat ground and downhill com-
pression braking speeds are 15 mph (24 kph) instead
of 13.5 mph (22 kph).
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
PERFORMANCE OPTIONS & DIAGNOSTICS
Changing Performance Options
The performance option may be changed if the existing
option is not compatible with the terrain that the vehicle
will be operated.
1. Raise the seat and move the Run-Tow/Maintenance
switch to the ‘TOW/MAINTENANCE’ position.
2. Locate the 5-pin performance option plug emanating
from the J-1 connector and remove the option plug.
3. Replace the existing performance option plug with the
desired new plug.
4. Move the Run-Tow/Maintenance switch to ‘RUN’.
(To activate a newly installed performance option plug,
cycle the Run-Tow/Maintenance switch by moving switch
to ‘Tow/Maintenance’ once again, and back to Run’.)
Performance
Option
Top Speed Compression
Braking
Strength
Anti-Stall
Protection
No Plug 13.5 mph
( 22 kph)
Heavy Yes
Blue Plug 13.5 mph
(22 kph)
Mild Yes
Yellow Plug 15 mph
(24 kph)
Heavy Yes
Red Plug 15 mph
(24 kph)
Mild Yes
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