Curtis 1236SE User Manual

16
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE Manual, os 30
24 NOVEMBER 2015
When a 3-wire potentiometer is used, the controller provides full fault
protection in accordance with EEC requirements. e pot is used in its voltage
divider mode, with the controller providing the voltage source and return. Pot
High provides a current limited 5V source to the pot, and Pot Low provides
the return path. is is the throttle shown in the basic wiring diagram (Figure 3)
for the drive throttle and for the brake throttle.
e ET-XXX electronic throttle is typically used only as a drive throttle.
e ET-XXX contains no built-in fault detection, and the controller will de-
tect only open wiper faults. It is the responsibility of the OEM to provide any
additional throttle fault detection necessary.
Throttle Type 3
For these 2-wire resistive potentiometers, shown in Figure 6, full throttle request
corresponds to 5 kΩ measured between the pot wiper pin and the Pot Low pin.
2 — INSTALLATION & WIRING: Throttle Wiring
Broken wire protection is provided by the controller sensing the current ow
from the wiper input (pin 16 or 17) through the potentiometer and into Pot
Low (pin 18). If the Pot Low input current falls below 0.65 mA, a throttle
fault is generated and the throttle request is zeroed. Note: Pot Low (pin 18)
must not be tied to ground (B-).
Throttle Type 4
Type 4 throttles operate in wigwag style. No signals to the controller’s forward
and reverse inputs are required; the direction is determined by the wiper input
value. Only 0–5V voltage sources and 3-wire potentiometers can be used as
Type 4 throttles. e controller interface for Type 4 throttles is the same as for
the corresponding Type 2 throttles; see Figure 5.
In a Type 4 throttle, the neutral point must be set up somewhere in the
center of the throw, with increasing voltage beyond this point providing increas-
ing forward command and voltages below this point providing increasing reverse
command. For example, you might set the Forward Deadband at 2.6 V with
Forward Max at 4 V, and Reverse Deadband at 2.4 V with Reverse Max at 1 V.
When a 3-wire pot is used, the controller provides full fault protection.
When a voltage throttle is used, the controller will detect open breaks in the
wiper input but cannot provide full throttle fault protection.
Fig. 6 Wiring for Type 3
throttles.
Pot Low input (Pin 18)
Pot Wiper input (Pin 16 or 17)
0–5kΩ
FASTER

Curtis 1236SE Specifications

General

Brand	Curtis
Model	1236SE
Category	Controller
Language	English