Response To Reduced Throttle - Curtis 1244 User Manual

Curtis 1244 Manual,
Rev. E

Response to Reduced Throttle

➅
The way the vehicle responds when the throttle is reduced or completely released
can be modified using the Decel Rate, Throttle Braking %, and Restraint pa-
rameters. This response is particularly noticeable when the vehicle is traveling
downhill.
step 1. Set the Decel Rate and Throttle Braking % parameters 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 and/or decrease the Throttle Braking %.
step 2. The default Restraint setting 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 small re-
ductions in 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 and/or Throttle Braking %
should be re-adjusted as in Step 1.
Smoothness of Direction Transitions
➆
After the major performance and responsiveness tuning has been completed,
additional fine tuning can be performed in the vehicle's transitions betweeen
braking and driving. These transitions are affected by the Taper Rate, Accel
Rate, Braking Rate, and Braking Current Limit parameters.
➆
-A Drive-to-Brake Transitions
step 1. If the transition is too slow: decrease the Braking Rate parameter
value for faster braking.
step 2. If the transition is too abrupt: increase the Braking Rate param-
eter value for slower braking.
step 3. If the braking distance is too long: increase the Braking Current
Limit parameter value or decrease the Braking Rate parameter
value.
step 4. If the applied braking torque is too high: reduce the Braking
Current Limit parameter value. Reducing the braking current
will also reduce motor heating, improve brush life, and improve
the forward-to-reverse transition feel. note: If the braking cur-
rent limit is changed, evaluation and adjustment of the Throttle
Braking % parameter may be necessary to obtain the response
originally set in procedure ➅ .
6 — VEHICLE PERFORMANCE ADJUSTMENT
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