Wesley BC-6200-8SA - Manual (Page 16)

10 Curtis 1268 Manual, Rev. D
WIRING: Throttle
Various throttles can be used with the 1268 controller, including 5kΩ 3-wire
potentiometers and 0–5V throttles. Some 1268 controller models are specifi-
cally designed to be compatible with ITS throttles.
The controller looks for a voltage signal at the wiper input (Pin 15), with
vehicle speed increasing with increased throttle voltage. All throttle fault pro-
tection is accomplished by monitoring the wiper input. This provides throttle
fault protection that meets all EEC requirements. Thus, no additional fault
protection is required on any throttle type used with the 1268 controller.
If the throttle you are planning to use is not covered, contact the Curtis
office nearest you.
3-Wire Potentiometer (5kΩ–10kΩ) Throttle
The 3-wire potentiometer is used in its voltage divider mode, with the voltage
source and return being provided by the controller. Pot High (Pin 13) provides
a current limited 5V source to the pot, and Pot Low (Pin 14) provides the
return path. The pot wiper is then connected to the Wiper Input (Pin 15).
Potentiometers with total resistance values between 5kΩ and 10kΩ can be
used. Wiring is shown in Figure 4.
2 — INSTALLATION & WIRING: Throttle
Fig. 4 Wiring for 3-wire
potentiometer throttle.
This wiring is also shown in the standard wiring diagrams, Figs. 3a and 3b.
0–5V Throttle
The active range for the 0–5V throttle is set by the parameters Throttle 0% and
Throttle 100%, and is measured relative to B-. Wiring is shown in Figure 5.
Fig. 5 Wiring for 0–5V
throttle.
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