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Standard throttle
Fig. 11
pot, 0–5k Ω .
Bi-directional
Fig. 12
twist-grip throttle with
10 k Ω center-tapped,
4-terminal pot.
Curtis PMC 1204X/1205X/1209/1221 Manual
Throttle Pot Wiring
Standard Potbox Wiring
If the throttle input to the controller is from a Curtis PMC potbox or footpedal,
the wiring is simple: just connect the two wires of the potbox/footpedal cable to
the two push-on terminals of the controller, as shown in Figure 8. It doesn't
matter which wire goes on which terminal. The wires can be extended as required.
: All vehicles with non-SRO controllers should have pedal-
IMPORTANT
actuated microswitches to protect against runaways in the event the for-
ward/reverse switch becomes stuck in either direction. If your potbox
doesn't have such a microswitch built in, you should add one.
Any suitable potentiometer of 5 kΩ nominal resistance will work with the
standard throttle input of the 1204X/1205X and 1209/1221 controllers. As
shown in Figure 11, connection should be made to the wiper and to one outer
terminal of the pot so that resistance increases as the throttle is applied.
0–5kΩ POT
FASTER
Pots for Twist-Grip Throttles
Twist grip throttles either twist in only one direction (and are used only for
acceleration), or they twist both ways (and are also used for reversing, by means
of microswitches that select a direction contactor). For twist grips that twist in
only one direction, the controller throttle input can be from a 5 kΩ pot as shown
above in Figure 11.
For twist grips that twist both ways, a pot capable of going from zero in
neutral to 5 kΩ in each direction can be used. A mechanism can be designed to
FASTER
5 kΩ
5 kΩ
FASTER
TO
THROTTLE
INPUT
make a standard pot turn in the same
direction regardless of which direction
the twist grip is turned. Alternatively, a
4-terminal, center-tapped 10 kΩ pot can
TO
be coupled directly to the twist grip, as
THROTTLE
INPUT
shown in Figure 12.
WIRING
FASTER
TO
THROTTLE
INPUT
16
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