4 — PROGRAMMABLE PARAMETERS
pg. 33
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
1- SPEED MODE — VELOCITY FEEDFORWARD MENU [OPTIONAL]
PARAMETER ALLOWABLE RANGE DESCRIPTION
Kvff
Kvff_SpdM
0x3014 0x00
0 – 500 A
0 – 5000
This velocity feedforward term is designed to improve throttle responsiveness
and speed controller performance, especially at low speeds.
For traction systems, set it to 50–70% of the current needed to maintain a
very low speed, unloaded, on at ground.
For a pump system, set it to the lowest load current (i.e., the current running
at the minimum load). Alternatively, the responsiveness of a pump speed
control loop can be signicantly enhanced by using a VCL program to
continuously update this parameter to the appropriate value as each pump
load is requested.
Build Rate
Vel_FF_Build_Rate_SpdM
0x3093 0x00
0.1 – 5.0 s
100 – 5000
Determines how fast the Kvff term builds up.
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 overshoot if too
much feedforward has been commanded.
Release Rate
Vel_FF_Release_Rate_SpdM
0x3094 0x00
0.1 – 5.0 s
100 – 5000
Determines how fast the Kvff term releases. If the release seems too abrupt,
slowing the release rate (i.e., setting it to a higher value) will soften the feel.
It should be set fast enough (i.e., at a low enough value) to prevent the
vehicle from running on after throttle release.
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