Curtis 1244 User Manual page 66

6 — VEHICLE PERFORMANCE ADJUSTMENT
60
step 4. Scroll up the Program Menu until the Max Speed parameter
is at the top of the display. While driving the vehicle with the
Field 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. Use the Field
Min parameter to tune the vehicle top speed. Then, to set the
top speed for walkie operation, leave the Field Min parameter
unchanged and decrease the Max Speed parameter until the
desired walking speed is reached.
Equalization of Loaded and Unloaded Vehicle Speed
➃
The top speed of a loaded vehicle can be set to approach the unloaded top
speed by tuning the 1244 controller's Field Map Start and Load Compensation
parameters. It is recommended that you review the description of the Field
Map Start parameter (page 38) and Load Compensation parameter (page 49)
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 the desired load capacity. Leave the Field Min and
Speed Max parameters at the settings determined during the
unloaded test.
step 3a. 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 it is unaccept-
able, proceed to (iv).
(iv) Increase the Load Compensation parameter and retest the
speed regulation. The Load Compensation parameter can be
increased until the desired regulation is achieved or the vehicle
speed begins to oscillate ("hunt") at low throttle.
Curtis 1244 Manual,
Rev. E