Curtis 1238SE - Application-Specific Features; Throttle Wiring

3 — APPLICATION-SPECIFIC FEATURES
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017 Return to TOC
pg. 20
3 — APPLICATION-SPECIFIC FEATURES
Some features of the 1232E/SE – 1238E/SE controllers aect how the specic controller is wired or
parameter settings. is chapter provides background information on application-specic features,
to assist the vehicle designer in the design process.
THROTTLE WIRING
In this manual, the term throttle is used in two senses: (1) as another name for the drive throttle,
and (2) as a generic term covering both the drive throttle and the brake throttle. Wiring is the same,
whether the throttle in question is used for acceleration or (regen) braking.
Various throttles can be used with these controllers. ey are characterized as one of ve types in
the programming menu of the 1313/1314 programmer.
Type 1: 2-wire 5kΩ–0 potentiometers
Type 2: single-ended 0–5V throttles, current source throttles, 3-wire potentiometers,
and electronic throttles
Type 3: 2-wire 0–5kΩ potentiometers
Type 4: wigwag 0–5V throttles and 3-wire potentiometers
Type 5: VCL input (VCL_Throttle or VCL_Brake)
e two throttle inputs (drive throttle and brake throttle) are programmed independently.
For potentiometers, the controller provides complete throttle fault protection that meets all
applicable EEC regulations. For voltage throttles, the controller protects against out-of-range wiper
values, but does not detect wiring faults; it is therefore the responsibility of the OEM to provide full
throttle fault protection in vehicles using voltage throttles.
rottle types 1–3 use the forward and reverse inputs (switches 7 and 8) in addition to the throttle
pot input to dene the throttle command (see Figure 15). rottle types 4 and 5 do not use the
forward and reverse inputs.
Wiring for the most common throttles is described in the following three pages and shown in the
accompanying illustrations. If a throttle you are planning to use is not covered, contact your Curtis
distributor or support engineer.
Throttle Type 1
For these 2-wire resistive potentiometers, shown in Figure 4, full throttle request corresponds to 0 Ω
measured between the pot wiper pin and the Pot Low pin. A Type 1 throttle requires the Forward &
Reverse Deadbands parameters settings be towards the higher voltage (e.g., 4.50 V) and the Forward
& Reverse Max parameters set to the lower voltage (e.g., 0.5 V). Note, this is the opposite of these
parameters' default setting. With the 2-wire rheostat in place, the throttle-wiper voltage can be check
using the Monitor » Inputs variable rottle Pot (or Pot2Raw for the brake pot).
Figure 4
Wiring for Type 1
throttles.
Pot Low input (Pin 18)
Pot Wiper input (Pin 16 or 17)
5kΩ–0
FASTER
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Figure 15 p.105