Curtis 1204 User Manual

15
Curtis PMC 1204/1205 Manual
nonstandard throttle input. As shown in Figure 12, a standard 20 kΩ pot
is used, with its end terminals wired together. The resistance goes from 5
kΩ at neutral to zero at the extremes — the opposite of the standard
Fig. 12 Bi-directional
twist-grip throttle with
a standard 20 k
Ω pot
and a controller with
the optional 5k Ω –0
throttle input.
throttle input configura-
tion. Contact the factory
if you need this type of
controller.
WARNING: with the input circuit shown in Figure 12,
potentiometer or wiring open circuits turn off the controller’s
output. However, pot wiring shorts appear the same as a
normal zero ohm signal to the controller, and will produce
full speed operation if the short occurs while the power is on.
Reduced speed operation
Vehicle top speed can be easily limited, for safety or other reasons. A single
resistor connected in parallel with the throttle pot will reduce maximum
speed according to its resistance value, as shown in Figure 13. Use of a
variable resistor makes adjustment of maximum speed easier. With a
switch, speed can be limited in reverse only, or the speed reduction can be
switched off — for example, to allow authorized personnel to run the
vehicle outdoors at full speed.
The speed reduction shown in the curve is approximate. The actual
vehicle top speed will depend on the motor characteristics and the vehicle
Fig. 13 Reduced speed
operation (with
standard 0–5k Ω pot).
TO
THROTTLE
INPUT
20 kΩ
SPEED
INCREASES
BOTH WAYS
WIRING
TO
THROTTLE
INPUT
SPEED
REDUCTION
RESISTOR
FASTER
OPTIONAL
SWITCH
SPEED REDUCTION RESISTOR
(k ohms)
APPROX. % OF ORIGINAL TOP SPEED
0 20406080100
25
20
15
10
5
0
0–5kΩ

Curtis 1204 Specifications

General

Brand	Curtis
Model	1204
Category	Controller
Language	English