Curtis PMC 1297 Manual
38
THROTTLE MAP
The
throttle map
parameter determines the static throttle map of the controller.
This parameter modifies the vehicle’s response to the throttle input. Setting the
throttle map 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, more responsive feel at low throttle settings.
The throttle map setting can be programmed between 20% and 80%. The
setting refers to the PWM output at half throttle, as a percentage of the throttle’s
full active range. The throttle’s active range is the voltage or resistance between
the 0% modulation point (the throttle deadband threshold) and the 100%
modulation point (the throttle max threshold).
With creep speed set at 0% and maximum speed set at 100%, a throttle
map setting of 50% will give 50% output at half throttle. As noted above, the
50% ramp shape is always a linear response. A throttle map setting of 80% will
give 80% output at half throttle. Six throttle map profiles (20, 30, 40, 50, 60,
and 80%) are shown in Figure 15; in all these examples the creep speed is set at
0% and the maximum speed at 100%.
3
A
— PROGRAMMABLE TRACTION PARAMETERS: Throttle
Fig. 15
Throttle maps for
controller with maximum
speed set at 100% and
creep speed set at 0%.
TRACTION THROTTLE INPUT (percent of active range)
CONTROLLER OUTPUT
(percent PWM)
80%
60%
50%
40%
30%
20%
THROTTLE MAP
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
SPEED PARAMETERS
0%
Creep Speed
100%
Max Speed
Raising the creep speed parameter or lowering the maximum speed
parameter limits the controller’s output range, as shown in Figures 16 and 17.
Controller output is always a percentage of the range defined by the speed
parameters (the range between the creep speed and maximum speed settings).