Curtis PMC 1297 Manual
74
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.
armature current displayed in the programmer’s Test Menu.
(ii) Set the Field Map Start parameter to the observed armature
current value.
(iii) Load the vehicle and drive it on flat ground with full throttle
applied. Further adjustments to the vehicle’s loaded speed can
now be made by varying the Field Map parameter. Increasing the
Field Map value will decrease the vehicle’s loaded speed, and
decreasing the Field Map value will increase the vehicle’s loaded
speed.
CAUTION:
If the Field Map Start parameter is set too high, the motor’s safe
commutation region may be exceeded. If this is the case, reduce the Field
Map Start parameter to a safe value. Then, adjust the Field Map
parameter as needed to reach the desired loaded top speed. Reducing the
Field Map value will help bring the loaded speed closer to the unloaded
speed. However, care must still be taken because it is possible for too low
Field Map values—like too high Field Map Start values—to result in
exceeding the motor’s safe commutation region.
TRACTION: FINE TUNING
Four additional vehicle performance characteristics can be adjusted:
➄
Response to reduced throttle
Response to increased throttle
Smoothness of direction transitions
Ramp climbing.
These characteristics are related to the “feel” of the vehicle and will be different
for various applications. Once the fine tuning has been accomplished, it should
not have to be repeated on every vehicle.
Typically, Mode 1 is configured for precision maneuvering, with the six
Mode 1 parameters (M1 Drive Current Limit, M1 Braking Current Limit, M1
Accel Rate, M1 Decel Rate, M1 Braking Rate, and M1 Maximum Speed) tuned
exclusively to provide comfortable vehicle response at low speeds.
➄
Response to Reduced Throttle
The way the vehicle behaves when the throttle is reduced or completely released
can be adjusted to suit your application, using the Decel Rate and Restraint
parameters. Refer to the description of these parameters in Section 3 before
beginning this procedure.
STEP 1. Set the Decel Rate based on the desired time for the vehicle to
stop upon release of throttle when traveling at full speed with full
load. If the vehicle brakes too abruptly when the throttle is
released, increase the Decel Rate.
5 — VEHICLE PERFORMANCE ADJUSTMENT: Traction Tuning
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