4 — PROGRAMMABLE PARAMETERS
pg. 41
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
2 - TORQUE MODE — FINE TUNING MENU
PARAMETER ALLOWABLE RANGE DESCRIPTION
Creep Torque
Creep_Torque_TrqM
0x3071 0x00
0 – 100%
0 – 32767
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 Fig. 9.
WARNING! 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 (page 48), 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; see Figure 9. 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
0x3837 0x00
25 – 100%
8192 – 32767
Determines the amount of brake pedal input that will fully cancel the creep
torque. Amount of cancellation is proportional to the brake input.
Creep Build Rate
Creep_Build_Rate_TrqM
0x3832 0x00
0.1 – 5.0 s
100 – 5000
Determines how fast the programmed creep torque builds when a direction
is selected.
Creep Release Rate
Creep_Release_Rate_TrqM
0x3833 0x00
0.1 – 5.0 s
100 – 5000
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
0x302A 0x00
0 – 100%
0 – 5000
Adjusts the throttle take-up from linear (0% setting) to an S curve. Larger
values create softer throttle take-up, in forward and reverse. Softening is
progressively reduced at higher speeds; see Figure 10.
Brake Taper Speed
Brake_Taper_Speed_TrqM
0x300F 0x00
200 – 6000 rpm
200 – 6000
Determines the motor speed below which the maximum braking current is
linearly reduced from 100% to 0% at zero speed; see Figure 11. 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.
Reversal Soften
Reversal_Soften
0x3074 0x00
0 – 100%
0 – 3000
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 and appears in two places.
Changing the value of this torque-mode parameter affects the parameter
listed in: Program » Speed Mode » Response » Fine Tuning » Reversal Soften.
Max Speed Decel
Max_Speed_Decel_TrqM
0x3835 0x00
0.1 – 30.0 s
100 – 30000
In some applications, the Max Speed value is changed frequently, through
VCL or over the CANbus. The Max Speed Decel parameter controls the rate at
which the maximum speed setpoint is allowed to change when the value of
Max Speed is lowered. The rate set by this parameter is the time to ramp from
Typical Max Speed rpm to 0 rpm.
For example, suppose you change Max Speed from 3000 rpm to 1000 rpm. If
Typical Max Speed is 5000 rpm, and the rate is 5.0 seconds, it will take
5.0 X (3000–1000) ÷ 5000 = 2.0 seconds to ramp from 3000 rpm to 1000 rpm.
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