Curtis 1253 - Throttle Maximum

18
Curtis 1253 Manual, Rev. F
3 — PROGRAMMABLE PARAMETERS: Throttle Parameters
deadband to be defined wide enough to ensure that the controller goes into
neutral when the throttle mechanism is released.
Examples of deadband settings (30%, 10%, 0%) are shown in Figure 8
for throttle types 0 through 3, using a nominal 5kΩ–0 potentiometer (where
applicable).
e programmer displays the throttle deadband parameter as a percentage
of the nominal wiper voltage range and is adjustable from 4% to 90%, in 1%
increments. e default deadband setting is 10%. e nominal wiper voltage
range depends on the throttle type selected. See Table 1 (page 11) for the char-
acteristics of your selected throttle type.
THROTTLE MAX
e rottle Max parameter sets the throttle wiper voltage required to produce
100% controller output. Decreasing the throttle max setting reduces the wiper
voltage and therefore the full stroke necessary to produce full controller output.
is feature allows reduced-range throttle assemblies to be accommodated.
Examples are shown in Figure 9 for throttle types 0 through 3, using a
nominal 5kΩ potentiometer (where applicable). ese examples illustrate the
eect of three dierent max output settings (100%, 90%, 60%) on the full-
stroke wiper voltage required to attain 100% controller output.
e programmer displays throttle max as a percentage of the throttle’s
active voltage range. e nominal voltage range depends on the throttle type
selected. See Table 1 (page 11) for the characteristics of your selected throttle
type. e throttle max parameter can be adjusted from 100% to 10%, in 1%
increments.
Notes: Voltages shown are at the pot wiper relative to B-.
For Types 0 and 1, the deadband points are defined in
terms of the nominal 5kΩ pot resistance. Using a pot
of greater or lesser resistance will give different values
for the deadband points.
Throttle Max parameter set at 100%.
0.5V
1.5V
5V
0
4.5V
(5.0kΩ)
30% Deadband
10% Deadband
0% Deadband
4.1V
(4.5kΩ)
3.3V
(3.5kΩ)
0.6V
(0Ω)
0.6V
(0Ω)
0.6V
(0Ω)
KEY
100%
Neutral
Deadband
Controller
Output
0%
5V
0
30% Deadband
10% Deadband
0% Deadband
5V
0
30% Deadband
10% Deadband
0% Deadband
1.0V
(500Ω)
1.8V
(1.5kΩ)
4.5V
(5.0kΩ)
4.5V
(5.0kΩ)
4.5V
(5.0kΩ)
5V
0
30% Deadband
10% Deadband
0% Deadband
5V
0
30% Deadband
10% Deadband
0% Deadband
Throttle Types 2 and 3 (0–5V and 3-wire pot)
Throttle Type 1 (5k
Ω–0)
Throttle Type 0 (0–5k
Ω)
0.6V
(0Ω)
Fig. 8, cont’d Eect of
adjusting the throttle
deadband parameter
(throttle types 2 and 3).