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Curtis 1298 Manual, OS 11
3 — PROGRAMMABLE PARAMETERS: Acceleration Feedforward Parameters (SPEED MODE)
1 – SPEED MODE ACCELERATION FEEDFORWARD MENU [OPTIONAL]
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Kaff 0–500 A This acceleration feedforward term is designed to improve throttle
Kaff_SpdM 0–5000 responsiveness and speed controller performance at all speeds. It can be
thought of as a “quick start” function which can enhance responsiveness
at all speeds.
Using your present accel and decel rates, observe the average
current you are running at full throttle at low speeds while accelerating
without load on flat ground, and set Kaff to 50–70% of that value.
Note: If any accel rate parameters get changed, this parameter will
need to be changed also.
Kbff 0–500 A This braking feedforward term is designed to improve braking
Kbff_SpdM 0–5000 responsiveness at all speeds.
Using your present decel rates, observe the average current you are
running at full throttle braking, and set Kbff to that value.
Build Rate 0.1–5.0 sec Determines how fast the Kaff and Kbff terms build up.
Acc_FF_Build_Rate_SpdM 100–5000 For traction systems, if you feel or hear the mechanical slop pick up
abruptly when you move the throttle from neutral to a very small value,
slowing the build rate (i.e., setting it to a higher value) will soften the feel.
For a pump system, start with this parameter at the minimum setting.
Slowing it down (i.e., setting it to a higher value) will reduce speed over
-
shoot if too much feedforward has been commanded.
Release Rate 0.1–2.0 sec Determines how fast the Kaff and Kbff terms release. It should be set fast
Acc_FF_Release_Rate_SpdM 100–2000 enough (i.e., at a low enough value) to prevent the vehicle from running
on after throttle release.
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