Curtis PMC 1297 Manual
13
Preliminary on Verso page is set with right edge at 7 and 7/8,
and the top (as on the Recto page) at 1/4.
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 pin (Pin 4) and the Pot Low pin (Pin 22), as shown in Figure 5. For Type 1
devices, zero speed corresponds to a nominal 5k
Ω
measured between the pot
wiper and Pot Low pins and full speed corresponds to 0
Ω
.
Fig. 5
Wiring for 5k
Ω
–0
throttle (“Type 1”).
14
13
15
16
17
18
19
20
21
22
23
24
12
11
10
9
8
7
6
5
4
3
2
1
5k
Ω
–0
Pot Low input (Pin 22)
Traction
Throttle
Wiper input (Pin 4)
FASTER
J1
2 — INSTALLATION & WIRING: Throttles
Broken wire protection is provided by the controller sensing the current
flow from the wiper input (Pin 4) through the potentiometer and into the Pot
Low pin (Pin 22). 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 throttle request is
zeroed.
NOTE
: The Pot Low pin must not be tied to ground (B-).
Single-Ended 0–5V Voltage Source, Current Source,
3-Wire Pot, and Electronic Throttles (“Type 2”)
With these throttles (“Type 2” in the programming menu) the controller looks
for a voltage signal at the wiper input. Zero speed corresponds to 0V and full
speed to 5V. A variety of devices can be used with this throttle input type,
including voltage sources, current sources, and 3-wire pots. The wiring for each
is slightly different and each has varying levels of throttle fault protection
associated with it.
0–5V Throttle
Two ways of wiring the 0–5V throttle are shown in Figure 6. The active range
for this throttle is from 0.2V (at 0% Throttle Deadband) to 5.0V (at 100%
Throttle Max), measured relative to B-. It is the responsibility of the OEM to
provide appropriate throttle fault detection for 0–5V throttles.
Sensor-referenced 0–5V throttles must provide a Pot Low current greater
than 0.65 mA to prevent shutdown due to pot faults. It is recommended that
the maximum Pot Low current be limited to 55 mA to prevent damage to the
Pot Low circuitry.
Ground-referenced 0–5V throttles require setting the Pot Low Check
parameter (see Section 3
A
, page 40) to Off; otherwise the controller will register
a throttle fault. For ground-referenced 0–5V throttles, the controller will detect
open breaks in the wiper input but cannot provide full throttle fault protection.
