Curtis 1212S Manual,
Rev. B
7
2 — INSTALLATION & WIRING:
Throttle
THROTTLE WIRING
Either a resistance throttle or a voltage throttle can be used with the 1212S
controller. The controller can accept a single-ended or inverse single-ended
input signal from the throttle, depending on how the Throttle Type parameter
is programmed; see page 14.
Voltage Throttle
Wiring for a voltage throttle is shown in the wiring diagram (Figure 3) for a
Curtis ET-1XX MCU, and here in Figure 4 for a simple voltage throttle that
would require forward and reverse switches. With a voltage throttle, the con-
troller can be programmed for a Throttle Type 0 or 1 input signal; see page 14.
Fig. 5
Wiring for 5k
Ω
,
3-wire potentiometer
throttle.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Fig. 4
Wiring for voltage
throttle.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+
-
VOLTAGE
THROTTLE
Pot Wiper input (Pin 1)
B-
The PotHigh and PotLow parameters are used to set the voltage range of
these throttles. If the pot wiper voltage is higher than the programmed PotHigh
value or lower than the programmed PotLow value, the controller will issue
an out-of-range throttle fault. In order for the controller to be able to detect
out-of-range throttle faults, the throttle must have a range within the limits
of 0.4–4.6 V.
Note: If a 0–5V throttle is used, it is the responsibility of the OEM
to provide appropriate throttle fault detection.
5k
Ω
, 3-Wire Potentiometer
A resistance throttle is shown in Figure 5. With this throttle, the controller can
be programmed for a Throttle Type 2 or 3 input signal; see page 14.
The controller provides full pot fault protection against open or shorted
wires anywhere in the throttle assembly. The overall pot resistance should be
4.3 to 7.0 k
Ω
. Values outside this range will trigger a fault condition. If a pot
fault occurs while the vehicle is moving, the controller will decelerate the vehicle
to a smooth stop using the decel rate set by the Key Off Decel parameter. If
the fault is corrected while the throttle is still applied, an HPD fault will be
issued and driving is disabled until throttle is reduced to neutral.
