Curtis PMC 1297 Manual
73
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.
Min set at the value selected in Step 3, decrease the Max Speed
parameter value until the desired vehicle top speed is set.
STEP
5.
For Walkie/Rider Applications:
Typically, different top speeds are
desired for walkie and rider operation. To tune a walkie/rider
vehicle’s top speed, first tune it for rider operation by using the
Field Min parameter. Then, to set the top speed for walkie
operation, leave the Field Min parameter alone and decrease the
Max Speed parameter until the desired walking vehicle speed is
reached.
Equalization of Loaded and Unloaded Vehicle Speed
The top speed of a loaded vehicle can be set to approach the unloaded top speed
by tuning the controller’s Field Map Start and Load Compensation parameters.
It is recommended that you review the description of the Field Map Start and
Load Compensation parameters in Section 3 before starting this procedure.
STEP
1. The vehicle’s unloaded top speed should already have been set. If
it was not, it should be set before the vehicle’s loaded top speed
is established.
STEP
2. Once the vehicle’s unloaded top speed has been set, load the
vehicle to its desired load capacity. Leave the Field Min and Max
Speed parameters at the settings determined during the unloaded
test.
STEP
3
A
. If the intent is to minimize the difference between the loaded and
unloaded vehicle speeds, then:
(i) Drive the fully loaded vehicle on flat ground with full throttle
applied. When the vehicle reaches maximum speed, observe the
armature current displayed in the programmer’s Test Menu.
(ii) Set the Field Map Start parameter slightly higher than the
observed armature current value.
(iii) Test the loaded/unloaded speed variation. If the observed
variation is unacceptable, proceed to “(iv).”
(iv) Increase the Load Comp parameter and retest the speed
regulation. The Load Comp parameter can be increased until the
desired regulation is achieved or the vehicle begins to oscillate
(“hunt”) at low throttle. If the loaded/unloaded speed variation
is acceptable but the average speed is not, adjustments can be
made to the Field Min parameter.
STEP
3
B
. If the intent is to make the loaded speed less than the unloaded
speed (for reasons of safety, efficiency, or reduced motor heating),
then:
(i) Unload the vehicle and drive it on flat ground with full throttle
applied. When the vehicle reaches maximum speed, observe the
5 — VEHICLE PERFORMANCE ADJUSTMENT: Traction Tuning