Curtis 1244 Manual, Rev. E
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3 — PROGRAMMABLE PARAMETERS: Speed Parameters
TAPER RATE
e taper rate parameter sets the rate at which the regenerative braking com-
mand ramps down at the completion of regen braking. is controls the feel of
the vehicle as it slows down and approaches zero speed. e taper rate should
be adjusted such that during a full speed direction transition, the vehicle comes
to a smooth stop before accelerating in the opposite direction. e taper rate
parameter is adjustable from 0 to 64 in increments of 1, with each increment
representing 1/32 of a second. is parameter is not active during plug braking.
M1–M4, MAx SPEED
e maximum speed parameter defines the maximum controller output at full
throttle. is parameter is adjustable from 0% to 100%, in 1% increments.
M1–M4, CREEP SPEED
e creep speed parameter defines the initial controller output generated when a
direction is first selected. No applied throttle is necessary for the vehicle to enter
the creep mode, only a direction signal. e output maintains creep speed until
the throttle is rotated out of the throttle deadband (typically 10% of throttle).
Creep speed is adjustable from 0% to 25% of the controller duty cycle,
in 1% increments. e specified creep speed percentage is not displayed as a
throttle percent in the programmer’s Test Menu when a direction is selected
and zero throttle is applied; only the throttle command is displayed.
REGEN SPEED
e regen speed parameter defines the vehicle speed above which the controller
initiates regenerative braking; below this speed, plug braking is used. Once the
vehicle begins regen braking, the system will continue to regen brake all the
way to zero speed. is threshold is important as it will aect the smoothness
of direction transitions when jockeying between forward and reverse at low
speeds. Regen braking provides the most benefit when the vehicle is decelerated
from fast speeds, whereas plug braking provides noticeably smoother direction
changes at slow speeds. e regen speed parameter is adjustable from 0% to
100% of the vehicle speed, in 1% increments. Recommendations for adjusting
the regen braking parameter are provided in Section 6: Vehicle Performance
Adjustment.
Speed Parameters
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