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Curtis 1244 Manual, Rev. E
3 — PROGRAMMABLE PARAMETERS: Current Limit Parameters
M1–M4, ThRT BRK %
e throttle braking percent parameter establishes the braking force applied to
the vehicle when the throttle is reduced. rottle braking is engaged when the
controller transitions from drive to neutral. e controller recognizes neutral
as the condition where neither direction switch is closed, regardless of throttle
input. is parameter is adjustable from 0% to 100% of the regen braking
current limit specified for a given mode, in 2% increments.
M1–M4, DRIVE C/L
e drive current limit parameter allows adjustment of the maximum current
the controller will supply to the motor during drive operation. is parameter
can be used to reduce the maximum torque applied to the drive system by the
motor in any of the modes. e drive current limit is adjustable from 200 amps
to the controller’s full rated current, in 5 amp increments. e full rated current
depends on the controller model.
M1–M4, BRAKE C/L
e braking current limit parameter allows adjustment of the maximum cur-
rent the controller will supply to the motor during regen braking operations.
During regen braking, this parameter controls the regen current from the
motor’s armature into the battery. e braking current limit is adjustable from
100 amps up to the controller’s full rated current, in 5 amp increments. e
full rated current depends on the controller model.
FIELD MIN
e minimum field current limit parameter defines the minimum allowed
current in the motor’s field winding. Its setting will determine the vehicle’s
maximum speed and, to some extent, the smoothness with which the vehicle
starts and transitions from one direction to another. If the Field Min value is set
high, the vehicle’s top speed will be reduced, but torque bumps may be evident
when the vehicle is inched or changes direction.
One of the greatest advantages of the Field Min parameter is that it will
prevent uncontrolled acceleration when the vehicle encounters a decline. e
vehicle’s speed is limited when it goes down ramps or when it is unloaded from
trucks, etc.
e Field Min parameter is adjustable from 2 to 20 amps, in 0.5 amp
increments. Recommendations for adjusting the Field Min parameter are pro-
vided in Section 6: Vehicle Performance Adjustment.
Current Limit Parameters
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