Curtis 1243
GEN
2 Manual
10
2 — INSTALLATION & WIRING:
Throttle
5k
Ω
–0 Throttle (“Type 1”)
The 5k
Ω
–
0 throttle (called a
“
Type 1
”
throttle in the programming menu of the
13XX programmer) is a 2-wire resistive throttle that connects between the Pot
Wiper and Pot Low pins (Pins 6 and 7), as shown in Figure 4. It doesn
’
t matter
which wire goes on which pin. For Type 1 throttles, zero speed corresponds to
5 k
Ω
measured between the two pins and full speed corresponds to 0
Ω
. (Note:
This wiring is also shown in the standard wiring diagram, Figure 3.)
Fig. 4
Wiring for 5k
Ω
–0
throttle (“Type 1”).
In addition to accommodating the basic 5k
Ω
–
0 throttle, the Type 1
throttle is the easiest with which to implement a wigwag-style throttle.
Using a 20k
Ω
potentiometer wired as shown in Figure 5, the pot wiper can
be set such that the controller has 5 k
Ω
between Pins 6 and 7 when the
throttle is in the neutral position. The throttle mechanism can then be
designed such that rotating it either forward or back decreases the resistance
between Pins 6 and 7, which increases the controller output. The throttle
mechanism must provide signals to the controller
’
s forward and reverse
inputs independent of the throttle pot resistance. The controller will not
sense direction from the pot resistance.
Fig. 5
Wiring for 20k
Ω
potentiometer used as a
wigwag-style throttle
(“Type 1”).
20 k
Ω
FASTER
FASTER
Pot Wiper input
(Pin 6)
Pot Low input
(Pin 7)
Broken wire protection is provided by the controller sensing the current
flow from the wiper input through the potentiometer and into the Pot Low pin.
If the Pot Low input current falls below 0.65 mA or its voltage below 0.06 V, a
throttle fault is generated and the controller is disabled. Note: The Pot Low pin
(Pin 7) must not be tied to ground (B-).
5k
Ω
–0
Pot Low input
(Pin 7)
Pot Wiper input
(Pin 6)
FASTER
