Wesley BC-6200-8SA - Manual (Page 23)

17 Curtis 1268 Manual, Rev. D
3 — PROGRAMMABLE PARAMETERS: Acceleration Parameters
M1/M2/REV ACCEL RATE
The acceleration rate defines the time, in seconds, for the controller to ac-
celerate from 0% output to 100% output. A larger value represents a longer
acceleration time and a gentler start. Fast starts can be achieved by reducing the
acceleration time, i.e., by adjusting the accel rate to a smaller value. The forward
accel rate can be set independently for each of the two operating modes; the
reverse accel rate applies to both M1 and M2.
M1/M2/REV DECEL RATE
The deceleration rate defines the time, in seconds, for the controller to reduce
the average voltage at the armature output from 100% PWM to 0% PWM.
A larger value represents a longer deceleration time and gentler vehicle slow-
ing. Quick stops can be achieved by reducing the deceleration time, i.e., by
adjusting the decel rate to a smaller value. The forward decel rate can be set
independently for each of the two operating modes; the reverse decel rate ap-
plies to both M1 and M2.
If the vehicle is slowing quicker than the decel rate (for example, at zero
throttle, traveling up a hill) the output will decay at a rate of 0.8 seconds.
FLD BRAKE
The field brake parameter enables or disables the field braking function. When
set to On, the field brake routine is enabled and will increase the vehicle brak-
ing near zero speed.
Related parameters: When FLD BRAKE is On, the Field Brake SPD , MAX , and RATE
parameters apply; they have no effect when FLD BRAKE is programmed Off.
FLD BRAKE SPD
The field brake speed parameter sets the speed threshold below which field
braking will occur when
FLD BRAKE is On. When the throttle has been released
and vehicle speed is detected to have fallen below FLD BRAKE SPD , the field current
starts to increase toward the value specified by FLD BRAKE MAX at a rate specified
by FLD BRAKE RATE . If the threshold speed is set very low, field braking will occur
only at the very end of vehicle deceleration. If the vehicle does not slow to the
speed defined by
FLD BRAKE SPD (down a steep hill, for example) field braking
will not occur as the threshold will not be reached.
Acceleration Parameters