4 — PROGRAMMABLE PARAMETERS
Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022 Return to TOC
pg. 60
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Forward Full Restraint Speed
Forward_Full_Restraint_
Speed_TrqM
0x3912 0x00
100 – 32000 RPM
100 – 32000
800 rpm Sets the speed point at which the full regen current will be
applied to restrain the vehicle from rolling forward.
Although this speed is never actually reached it does set the slope
of the restraint strength and can be thought of as a gain.
Setting this parameter too low can cause oscillations.
Back Full Restraint Speed
Back_Full_Restraint_Speed_
TrqM
0x3905 0x00
100 – 32000 RPM
100 – 32000
800 rpm Sets the speed point at which the full regen current will be
applied to restrain the vehicle from rolling in reverse (backward).
Although this speed is never actually reached it does set the slope
of the restraint strength and can be thought of as a gain.
Setting this parameter too low can cause oscillations.
TORQUE MODE MENU, cont’d
TORQUE MODE MENU — FINE TUNING MENU
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Creep Torque
Creep_Torque_TrqM
0x3910 0X00
0 – 100 %
0 – 32767
0 % Determines the amount of torque applied to the vehicle at a
stop with no throttle input to emulate the feel of an automatic
transmission automobile. See Figure 18.
When interlock is engaged creep torque allows vehicle
propulsion if a direction is selected even though no throttle is
applied. Care should be taken when setting up this parameter.
If pedal braking is enabled creep torque is progressively disabled
as brake is applied so as to prevent the motor from driving into
the brakes and thus wasting energy.
Creep Torque and Neutral Taper Speed interact to create the slope
of the torque response as the vehicle approaches zero speed. If
the vehicle oscillates as it coasts down toward zero speed try
lowering Creep Torque or increasing Neutral Taper Speed.
Brake Full Creep Cancel
Brake_Full_Creep_Cancel_
TrqM
0x3906 0X00
25 – 100 %
8192 – 32767
50 % Determines the amount of brake pedal input that will fully cancel
the creep torque. The amount of cancellation is proportional to the
brake input.
Creep Build Rate
Creep_Build_Rate_TrqM
0x390B 0X00
0.1 – 5.0 sec
100 – 5000
0.1 sec Determines how fast the programmed creep torque builds when
a direction is selected.
Creep Release Rate
Creep_Release_Rate_TrqM
0x390E 0x00
0.1 – 5.0 sec
100 – 5000
3 sec Determines how fast the programmed creep torque releases
when the brake is cancelling the creep torque or when the
direction switches are cleared (neutral).
Gear Soften
Gear_Soften_TrqM
0x3914 0x00
0 – 100 %
0 – 5000
20 % Adjusts the throttle take-up from linear (0% setting) to an S curve.
See Figure 19.
Larger values create softer throttle take-up in forward and
reverse. Softening is progressively reduced at higher speeds.
Brake Taper Speed
Brake_Taper_Speed_TrqM
0x3909 0x00
20 – 24000 RPM
20 – 24000
1000 rpm Determines the motor speed below which the maximum braking
current is linearly reduced from 100% to 0% at zero speed.
Setting the taper speed too low for the braking current will cause
oscillations in the motor as it attempts to brake the vehicle to a
stop on very steep slopes.
Taper speed is applicable only in response to brake pedal input; it
does not affect direction reversal braking or neutral braking.
If the vehicle is in restraint when the brake is pressed the
applied braking torque is affected by both Brake Taper Speed
and Forward (or Back) Full Restraint Speed. If the vehicle
oscillates in this mode it may be necessary to increase one or
more of these parameters. See Figure 20.
Reversal Soften
Reversal_Soften
0x310B 0x00
0 – 100 %
0 – 3000
20 % Larger values create a softer reversal from regen braking to drive
when near zero speed. This helps soften the transition when the
regen and drive current limits are set to different values.
Note: This parameter is not mode-specic.
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