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Curtis 1244 Manual, Rev. E
3 — PROGRAMMABLE PARAMETERS: Acceleration Parameters
M1–M4, ACCEL RATE
e acceleration rate defines the time it takes the controller to accelerate 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. e acceleration rate is
adjustable from 0.1 second to 5.0 seconds, in 0.1 second increments. It can be
set independently for each of the four operating modes.
M1–M4, BRAKE RATE
e braking rate defines the time it takes the controller to increase from 0%
regen braking current to 100% regen braking current when braking is requested.
A larger value represents a longer time and therefore a gentler increase in braking
strength. Full braking strength is achieved more quickly when the braking rate
parameter value is reduced. e braking rate is adjustable from 0.1 second to
5.0 seconds, in 0.1 second increments, and can be set independently for each
of the four operating modes.
DECEL RATE
e deceleration rate defines the time it takes the controller output to respond
to a decrease in applied throttle. e deceleration rate defines the vehicle’s braking
characteristic for any reduction in throttle, including to neutral, that does not
include a request for the opposite direction. It also defines the characteristic for
braking after Emergency Reverse is released. e decel rate is adjustable from 0
to 10 seconds, in 0.1 second increments. e decel rate works in conjunction
with the throttle braking percent parameter, which must be set greater than zero
for the programmed decel rate to be active. e decel rate is not a MultiMode™
parameter, and its value will therefore aect all four operating modes.
QUICK START
e quick start function provides faster than normal acceleration in response to
fast changes in throttle demand. Upon receiving a sudden high throttle demand
from neutral, the quick start function causes the controller to exceed its normal
acceleration rate. e quick start algorithm is applied each time the throttle
passes through neutral and the controller is not in braking mode. Quick start
is adjustable from 0 to 10, in increments of 1. Increasing the value “livens” the
vehicle’s acceleration response to fast throttle movements.
Acceleration Parameters
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