Curtis Instruments AC F4-A User Manual

4 — PROGRAMMABLE PARAMETERS
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 42
SPEED MODE/SPEED CONTROLLER — ACC FEEDFORWARD MENU
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Kaff
Kaff_SpdM
0x3828 0x00
0 – 500A
0 – 5000
0 Amp The design of the acceleration feedforward term is to improve
throttle responsiveness and speed controller performance at
all speeds.
As a quick start function, it enhances the responsiveness at all
speeds. This Acceleration Feedforward is a constant value applied
in the direction of travel during acceleration.
Set this parameter while using the application’s present Accel and
Decel rates by observing the average current while running full
throttle at low speeds, accelerating without a load on at ground.
Set Kaff to 50–70% of that value.
Note: If any Accel rate parameters change, this parameter will
also need to be changed (updated).
Kbff
Kbff_SpdM
0x3829 0x00
0 – 500A
0 – 5000
0 Amp The design of the braking feedforward term is to improve braking
responsiveness at all speeds. This Braking Feedforward is a
constant value applied opposite the direction of travel during
braking or deceleration.
Using the application’s present decel rates, observe the average
current at full throttle braking and set Kbff to that value.
Build Rate
Acc_FF_Build_Rate_SpdM
0x3808 0x00
0.1 – 5.0 s
100 – 5000
1.0 sec Determines how fast the Kaff and Kbff terms build up.
For traction systems, if the mechanical lash (slop) picks up
abruptly when moving 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
Acc_FF_Release_Rate_SpdM
0x3809 0x00
0.1 – 5.0 s
100 – 5000
0.4 sec Determines how fast the Kaff and Kbff terms release. It should be
set fast enough (i.e. at a low enough value) to prevent the vehicle
from running on after throttle release.

Curtis Instruments AC F4-A Specifications

General

Brand	Curtis Instruments
Model	AC F4-A
Category	Controller
Language	English