Throttle Wiring; 5Kω, 3-Wire Potentiometer Throttle; 5V Throttle - Curtis MultiMode 1228 Manual

2 — INSTALLATION & WIRING:
Fig. 5 Wiring for 3-wire,
5k Ω potentiometer throttle.
10
Throttle

THROTTLE WIRING

A 3-wire potentiometer throttle or a voltage throttle can be used. The 1228
controller can accept a single-ended, inverse single-ended, wigwag, or inverse
wigwag input signal from the throttle, depending on how the Throttle Type
parameter is programmed; see page 22.
Wiring for the 3-wire pot, voltage throttle, and Curtis ET-XXX electronic
throttle is described in the following text. If the throttle you are planning to
use is not covered, contact the Curtis office nearest you.
5kΩ, 3-Wire Potentiometer
A 5kΩ, 3-wire potentiometer is the standard throttle, and is shown in the
basic wiring diagrams (Figures 3a/3b and 4a/4b) as well as in Figure 5. With
this throttle, the controller can be programmed for a Type 0, 1, 2, or 3 input
signal; see page 22.
3-WIRE
5kΩ
POT
For wigwag and inverted wigwag applications, the pot can be correctly
centered within the controller's neutral band by using the throttle autocalibration
feature (see page 23). Pots with less than 5 kΩ total resistance change over the
throttle's full stroke can be accommodated by programming the controller for
reduced-range throttle inputs, via the throttle gain parameter (see page 25).
The controller provides full pot fault protection against open or shorted
wires anywhere in the throttle assembly. The overall pot resistance can range
from 4.5 kΩ to 7 kΩ. Values outside this range will trigger a fault condition.
If a pot fault occurs while the vehicle is moving, the controller will deceler-
ate the vehicle to neutral through its normal deceleration curve. If the fault
is corrected while the throttle is still applied, the vehicle will accelerate to the
requested speed.

5V Throttle

A 5V throttle can be used instead of a pot, as shown in Figure 6. With this
throttle, the controller can be programmed for a Type 0, 1, 4, or 5 input signal;
see page 22.
With a wigwag or inverted wigwag input, the throttle output voltage
must be 2.5 V (± deadband) in neutral and a 4.7kΩ, 0.25W resistor must be
added between the pot high and pot low pins. A resistor is not required with
a single-ended input.
Pot High output (Pin 3)
Wiper input (Pin 4)
Pot Low input (Pin 13)
Curtis 1228 Manual,
Rev. F