Curtis PMC 1297 Manual
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high can cause the vehicle to feel uncontrollable when the throttle is released,
as it will continue to drive for a short period. The throttle decel rate is adjustable
from 0.1 to 1.0 second, with a value of 0.3 or 0.4 working well for most vehicles.
When the armature current goes negative (i.e., at the point when positive
torque transitions to negative torque), the normal decel rate goes into effect.
INT BRAKE C/L
If the interlock switch is opened while the vehicle is being driven, the controller
will send braking current to the motor. This braking—which is called interlock
braking—greatly reduces wear on the vehicle’s electromagnetic brake and also
enables the vehicle to meet more stringent stopping distance requirements. The
interlock braking current limit parameter allows adjustment of the maximum
braking current the controller will supply to the motor during interlock braking.
The interlock braking current limit is adjustable from 50 amps up to the
controller’s full rated braking current. (The full rated braking current depends
on the controller model; see specifications in Table E-1.)
INT BRAKE RATE
The interlock braking rate parameter defines the time it takes the controller to
increase from 0% braking output to 100% braking output when interlock
braking is initiated. The interlock braking rate is adjustable from 0.0 to 3.0
seconds.
INT BRAKE DLY
The interlock braking delay feature allows the interlock switch to be cycled
within a set time (the braking delay), thus preventing inadvertent activation of
interlock braking. This feature is especially useful in applications where the
interlock switch may bounce or be momentarily cycled during operation. The
interlock braking delay parameter can be set from 0.0 to 30.0 seconds, with zero
corresponding to no delay.
RESTRAINT
Because the 1297 controller is configured to provide regenerative braking, overspeed
causes the controller to create a braking current and thus limit or “restrain” the
overspeed condition. The restraint parameter determines how strongly the control-
ler tries to limit the vehicle speed to the existing throttle setting. It is applicable
when throttle is reduced or when the vehicle begins to travel downhill.
At zero throttle, the restraint function tries to keep the motor at zero speed,
which helps hold the vehicle from running away down ramps. The higher the
restraint value, the stronger the braking force applied to the motor and the
3
A
— PROGRAMMABLE TRACTION PARAMETERS: Braking
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