The pot low pin (pin 7) must not be tied to ground – Vestil EPT-30 User Manual
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Curtis PMC 1207/1207A Manual
11
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.
Broken wire protection for Type 1 throttles is provided by the controller
sensing the current flow from the 5k
Ω–0 input through the pot and into the Pot
Low pin. If the Pot Low input current falls below 0.1 mA, a throttle fault is
generated and the controller is disabled.
NOTE
: The Pot Low pin (Pin 7) must not
be tied to ground.
0–5V, 0–10V, 3-Wire Potentiometer, and Electronic Throttles (“Type 2”)
With these throttles (“Type 2” in the programming menu), the controller looks
for a voltage signal at either the pot wiper/0–5V input of the controller (Pin 6) or
the 0–10V input (Pin 9). Zero speed corresponds to 0V and full speed corre-
sponds to either 5V or 10V, measured relative to B-. Pot Low is the current return
path for all Type 2 throttles.
A voltage source, 3-wire pot, or electronic throttle can be used with this
throttle type. The wiring for each is slightly different and each has varying levels
of throttle fault detection associated with it.
0–5V Throttle
Two ways of wiring the 0–5V throttle are shown in Figure 7. Broken wire
protection is provided by the controller looking for a minimum current into the
(b)
Ground-referenced
0–5V throttle
(a)
0–5V throttle sensor
Fig. 7
Wiring for 0–5V
throttle (“Type 2”).
2 — INSTALLATION & WIRING: 1207 Controller
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
+
-
+
B-
16
15
14
13
12
11
10
9
4.7 k
Ω
(Shunt impedance 150 k
Ω
to ground)
Pin 7
Pin 6
Pin 5
Pot Low
0–5V Input
Pot High
PIN KEY (1207)
Pin 7
Pin 6
Pot Low
0–5V Input
PIN KEY (1207)
SENSOR GROUND
SENSOR OUTPUT
0–5V
SENSOR