Specifications

Curtis PMC 1223/33, 1225/35, 1227/37 Manual
38
3 — PROGRAMMABLE PARAMETERS
throttle is used, the throttle gain parameter sets the pot wiper resistance required
to produce 100% output in both forward and reverse: the wiper voltage required
for full forward output is decreased, and the wiper voltage required for full reverse
output is increased.
NOTE: The throttle characteristics are defined in terms of wiper voltage
rather than throttle pot resistance because of the range of pot values that can be
used and the variation between pots of the same value. The voltage values shown
in Figure 21 will hold true for any potentiometer value within the allowed 4.5 kΩ
to 7.0 kΩ range.
RAMP SHAPE [default access: OEM]
The ramp shape parameter determines the static throttle map of the controller.
This parameter modifies the vehicle’s response to the throttle input. Setting the
ramp shape parameter at 50% provides a linear output response to throttle
position. Values below 50% reduce the controller output at low throttle settings,
providing enhanced slow speed maneuverability. Values above 50% give the
vehicle a faster, jumpier feel at low throttle settings.
The ramp shape can be programmed in 1% increments between 20% and
70%. The ramp shape number refers to the PWM output at half throttle, as a
percentage of its full range. For example, if maximum speed is set at 100% and
creep speed is set at 0, a ramp shape of 50% will give 50% output at half throttle.
The 50% ramp shape corresponds to a linear response. Six ramp shapes (20, 30,
40, 50, 60, and 70%) are shown as examples in Figure 22, with the maximum
speed set at 100% and the creep speed set 0.
THROTTLE (percent)
PWM (percent)
70%
60%
50%
40%
30%
20%
RAMP SHAPE
100
90
80
70
60
50
40
30
20
10
0
100908070605040302010 0
CREEP
SPEED
(0)
MAXIMUM SPEED (100%)
Fig. 22 Ramp shape
(throttle map) for control-
ler with maximum speed
set at 100% and creep
speed set at 0.