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Curtis PMC 1297 Manual
75
i
and the top (as on the Recto page) at 1/4.
STEP
2. The default Restraint setting (8 amps) should work well for most
vehicles. If the vehicle exhibits excessive overspeed when driving
down a ramp, increase the Restraint value. If the vehicle “speed
hunts” while driving down a ramp or brakes too abruptly at low
or released throttle, decrease the Restraint value.
STEP
3. If the Restraint value has been adjusted, retest braking behavior
when throttle is reduced to ensure that it still has the desired feel.
If it does not, the Decel Rate should be re-adjusted as in Step 1.
Response to Increased Throttle
The way the vehicle reacts to quick or slow increased throttle requests can be
modified using the Accel Rate, Current Ratio, and Throttle Map parameters.
Optimal vehicle response is tuned by adjusting these parameters and then
accelerating the vehicle from a dead stop under various throttle transition
conditions.
STEP
1. Set Throttle Map = 50%.
STEP
2. Drive the vehicle and adjust the Accel Rate for the best overall
response. If the vehicle starts too slowly under all driving condi-
tions, the Accel Rate should be reduced.
STEP
3. Increasing vehicle acceleration. If acceleration feels good for slow
or moderate throttle transitions but the vehicle initially starts too
slowly, set the Current Ratio parameter to 2 or higher.
STEP
4. Achieving better control at low speeds. If the vehicle responds
well for fast, full range throttle transitions but is too jumpy
during low speed maneuvering, reduce the Throttle Map and/or
set the Current Ratio to 1.
Smoothness of Direction Transitions
Additional fine tuning can be performed to enhance the vehicle’s transitions
between braking and driving.
STEP
1. Ensure that the Braking Rate parameter has been set for the desired
response (see Section 3
A
, page 25).
STEP
2. If the transition is too abrupt: increase the Taper Rate and/or set
the Variable Braking parameter to On. Secondary adjustments
can be made by increasing the Accel Rate.
STEP
3. If the transition is too slow: decrease the Taper Rate and set
Creep Speed to 5% or greater. Secondary adjustments can be
made by decreasing the Accel Rate or increasing the Current
Ratio.
5 — VEHICLE PERFORMANCE ADJUSTMENT: Traction Tuning