Curtis PMC 1297 Manual
12
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.
2 — INSTALLATION & WIRING: Throttles
WIRING: Throttles
Various throttles can be used with the 1297 controller. They are categorized as
one of four types in the programming menu of the 13XX programmer. Only
Types 2 and 4 can be used for the hydraulic throttle.
Type 1: two-wire 5k
Ω
–0 potentiometer throttles
Type 2: 0–5V throttles, current source throttles, three-wire pot throttles,
and electronic throttles—
wired for single-ended operation
Type 3: two-wire 0–5k
Ω
potentiometer throttles
Type 4: 0–5V and three-wire pot throttles—
wired for wigwag-style
operation
Table 1 summarizes the operating specifications for these four throttle types.
NOTE
: For Type 2 and Type 4 throttles, the controller reads only voltage at the
wiper input—even when potentiometers are used.
Table 1
THROTTLE WIPER INPUT THRESHOLD VALUES
MAXIMUM
THROTTLE
HPD
THROTTLE
MINIMUM
THROTTLE
THROTTLE
DEADBAND
(25% throttle
MAX
THROTTLE
TYPE
PARAMETER
FAULT
(0% speed request)
active range)
(100% modulation)
FAULT
1
Wiper Voltage
5.00 V
3.80 V
2.70 V
0.20 V
0.06 V
Wiper Resistance
7.50 k
Ω
5.50 k
Ω
3.85 k
Ω
0 k
Ω
—
2
Wiper Voltage
0.06 V
0.20 V
1.50 V
5.00 V
5.80 V
Wiper Resistance
—
—
—
—
—
3
Wiper Voltage
0.06 V
0.20 V
1.30 V
3.80 V
5.00 V
Wiper Resistance
—
0 k
Ω
1.65 k
Ω
5.50 k
Ω
7.50 k
Ω
4
Wiper Voltage
0.50 V
2.50 V
(Fwd/Lift)
*
3.10 V
(Fwd/Lift)
4.40 V
(Fwd/Lift)
4.50 V
2.50 V
(Rev/Lower)
*
1.90 V
(Rev/Lower)
0.60 V
(Rev/Lower)
Wiper Resistance
—
—
—
—
—
Notes: The upper and lower deadbands are valid for nominal 5k
Ω
potentiometers or 5V sources with
the default Throttle Deadband and Throttle Max parameter settings of 0% and 100%
respectively. These values will change with variations in the Throttle DB and Throttle Max
parameter settings—
see Section 3
A
, pages 34 and 36, and Section 3
B
, pages 51 and 53.
The HPD thresholds are 25% of the active range and therefore dependent on the pro-
grammed Throttle DB and Throttle Max settings (which define the active range). For Type 4
hydraulic
throttles, the thresholds in the HPD column apply to the Hydraulic Inhibit feature.
*
With 0% Throttle Deadband, there is no neutral point on a Type 4 pot. It is recommended
that an 8% minimum deadband be used with Type 4 throttles.
For potentiometers, the 1297 provides complete throttle fault protection that
meets all applicable EEC regulations. For voltage throttles, the 1297 protects
against out-of-range wiper voltages (see Table 1), but does not detect wiring
faults; it is therefore the responsibility of the OEM to provide full throttle fault
protection in vehicles using voltage throttles.
Wiring for the most common throttles is described in the following text.
If the throttle you are planning to use is not covered, contact the Curtis office
nearest you.
