Specifications

Curtis PMC 1223/33, 1225/35, 1227/37 Manual
37
values shown in Figure 20 will hold true for any potentiometer value within the
allowed 4.5 kΩ to 7.0 kΩ range.
THRTL GAIN [default access: OEM]
The throttle gain parameter sets the wiper voltage required to produce 100%
controller output. Decreasing the throttle gain setting reduces the wiper voltage
and therefore the full stroke necessary to produce full controller output. This
feature allows reduced-range throttle assemblies to be accommodated.
Examples of throttle gain settings are shown in Figure 20, to illustrate the
effect of three different throttle gain settings (100%, 75%, 40%) on the full-
stroke wiper voltage required to attain 100% controller output.
The programmer displays the throttle gain parameter as a percentage of the
active throttle voltage range. The active throttle voltage range is the nominal
voltage range (4V) minus the throttle deadband. As the throttle deadband is
increased, the active throttle voltage range decreases. The throttle gain parameter
can be adjusted from 10% to 100%, in 1% increments.
When a single-ended throttle is used, the throttle gain parameter sets the
maximum pot wiper voltage required to produce 100% output. When a wigwag
3 — PROGRAMMABLE PARAMETERS
Fig. 21 Effect of adjusting the throttle gain parameter.
Single-Ended Throttle
Wigwag Throttle
4.5V
0.5V
4.5V
0 5V
100% Throttle Gain
15% Deadband
75% Throttle Gain
15% Deadband
40% Throttle Gain
8% Deadband
1.1V
0 5V
2.2V 2.8V
2.5V
KEY:
Neutral 0% 100%
Deadband output output
Notes: Voltages shown are at the pot wiper relative to B-.
Voltages are relative to a nominal 5kΩ pot.
0.93V
1.6V 3.4V
4.1V
3.7V
2.3V
V
100%
= V
DB
+ (Gain%) (4V) (1 − DB%)
0.8V
75% Throttle Gain
8% Deadband
2.34V 2.66V
0.96V 4.0V
3.6V
V
100%
= V
DB
± (0.5) (Gain%) (4V) (1 − DB%)
2.2V 2.8V
2.34V 2.66V
1.1V
0.8V
0.5V