2 — INSTALLATION & WIRING:
Throttle Wiring
Throttle Type 2
With Type 2 throttles, the controller looks for a voltage signal at J3.
Zero throttle request corresponds to 0 V and full throttle request to 5 V. A
variety of devices can be used with this throttle input type, including voltage
sources, current sources, and electronic throttles. The wiring for each is slightly
different, as shown in Figure 10, and they have varying levels of throttle fault
protection.
When a voltage source is used as a throttle, it is the responsibility of the
OEM to provide appropriate throttle fault detection. For ground-referenced
0–5V throttles, the controller will detect open breaks in the wiper input but
cannot provide full throttle fault protection.
To use a current source as a throttle, a resistor must be added to the circuit
to convert the current source value to a voltage; the resistor should be sized to
provide a 0–5V signal variation over the full current range. It is the responsibil-
ity of the OEM to provide appropriate throttle fault detection.
The Curtis ET-XXX electronic throttle contains no built-in fault detec-
tion, and the controller will detect only open wiper faults. It is the responsibil-
ity of the OEM to provide any additional throttle fault detection necessary.
For wiring other electronic throttles, consult the instructions that are provided
with the throttle.
There are many electronic footpedals on the market; for wiring, consult
the instructions that are provided with the footpedal.
Throttle Type 6
The ITS+ connects to J2, and ITS- connects to J3.
Throttle Types 7, 8
Wiring for these voltage input throttles is the same as for Type 2 throttles; the
throttle input goes to J3 and the ground return to B-.
Throttle Type 9
The Pot High input goes to J2, the Pot Wiper goes to J3, and the ground
return goes to B-.
When a 3-wire pot is used, the controller provides full fault protection.
12
Curtis 1204M/1205M/1209M/1221M Manual