Curtis PMC 1297 Manual
17
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.
Fig. 10
Wiring for
0–5k
Ω
throttle (“Type 3”).
0–5k
Ω
Throttle (“Type 3”)
The 0–5k
Ω
throttle (“Type 3” in the programming menu) is a 2-wire resistive
throttle that connects between the pot wiper pin (Pin 4) and the Pot Low pin,
as shown in Figure 10. Zero speed corresponds to 0
Ω
measured between the two
pins and full speed corresponds to 5 k
Ω
.
14
13
15
16
17
18
19
20
21
22
23
24
12
11
10
9
8
7
6
5
4
3
2
1
0–5k
Ω
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-).
Wigwag-Style 0–5V Voltage Source and 3-Wire Pot Throttle (“Type 4”)
These throttles (“Type 4” in the programming menu) operate in true wigwag
style. No signals to the controller’s forward and reverse (or lift and lower) inputs
are required; the action is determined by the wiper input value. The interface to
the controller for Type 4 devices is similar to that for Type 2 devices. The neutral
point will be with the wiper at 2.5 V, measured between Pin 4 or 21 and B-.
For the traction throttle, the controller will provide increasing forward
speed as its wiper input value (Pin 4) is increased, with maximum forward speed
reached at 4.5 V. The controller will provide increasing reverse speed as the
wiper input value is decreased, with maximum reverse speed reached at 0.5 V.
For the hydraulic throttle, the controller will provide increasing Lift speed as its
wiper input value (Pin 21) is increased, with maximum Lift speed reached at
4.5 V. The controller will provide increasing Lower speed as the wiper input
value is decreased, with maximum Lower speed reached at 0.5 V. The mini-
mum and maximum wiper voltage for either throttle must not exceed the 0.5V
and 4.5V fault limits.
When a 3-wire pot is used and the Pot Low Check parameter (see Section
3
A
, page 40) is set to On, the controller provides full fault protection for Type 4
traction throttles. Any potentiometer value between 1 k
Ω
and 10 k
Ω
is sup-
ported. When a voltage throttle is used, it is the responsibility of the OEM to
provide appropriate throttle fault detection.
NOTE
: If your Type 4 throttle has an internal neutral switch, this internal
neutral switch should be wired to the forward switch input (Pin 12). The
controller will behave as though no throttle is requested when the neutral
switch is high, and will use the throttle value when the neutral switch is low.