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44
Curtis enAble
®
40-Series Manual, Rev. B
to increase or decrease the speed the chair drives while mak-
ing a wide turn.
c. To add Dynamic Turn Radius Control, first adjust the
Speed Full Turn parameter. Select the slowest speed mode
and drive the chair at full throttle, making fast sharp turns
left and right. If the chair responds as desired, select the
next higher speed mode and again drive the chair at full
throttle, making fast sharp turns. Continue working your
way up through the speed modes until you notice instability
or feel the chair turns too sharply. Set the Speed Full Turn
parameter to just below the the value of that speed mode.
d. Next adjust the Speed No Turn parameter. Start by set
-
ting Speed No Turn = 200%. Select the fastest speed
mode, and drive at full throttle, making fast sharp turns.
If the chair feels unstable in fast turns, lifts a wheel, or
turns too sharply, decrease the Speed No Turn parameter
until stable performance is achieved. Then select the
next slower speed mode, and repeat the exercise. Work
your way down through the speed modes to the slowest
mode, adjusting the value of Speed No Turn as you go.
Note: Speed No Turn should never be set lower than
Speed Full Turn; doing so will disable the Dynamic Turn
Radius Control algorithm.
STEP 4. Repeat steps 2 and 3, making readjustments as needed. The Gate
Shape and Dynamic Turn Radius Control parameters adjusted in
step 3 interact closely with the basic Turn Accel and Turn Decel
parameters adjusted in step 2.
STEP 5. When the performance seems close, you can try these two ad-
ditional maneuvers to test and fine tune.
a. Drive the chair straight and do a 180° turn and travel straight
back the way you came. Did the chair turn around smoothly?
Did it snap back into the straight line precisely?
b. Place a cone or box on the floor. Travel toward it at full
speed and attempt to maneuver around it quickly. Did the
chair respond easily without needing extra corrections after
the quick dodge?
bm Adjust the Steering Sensitivity
The Steering Sensitivity parameter (Program > Profile 1 > Steer menu) adjusts
the sensitivity to small steering inputs. This parameter is greatly affected by
the chair’s drive wheel configuration. Rear-wheel-drive chairs typically need
the highest adjustments, while mid-wheel- and front-wheel-drive chairs are
naturally sensitive and require a lower setting.
7 — TUNING GUIDE