Ac Motor Tuning Guide; Selecting The Control Mode; Speed Mode Express Tuning - Kohler Curtis F Series Manual

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Once a vehicle/motor/controller combination is tuned, use the parameter values as the standard for
the system or vehicle model. Any changes in the motor, the vehicle drive system, or the controller
will require that the system be re-tuned to provide optimum performance. These steps are for tuning
the AC traction motor, not an AC pump motor.
Hint: If using the 1313 handheld programmer, add the "tuning" parameters and monitor variables
to the Favorites menu for quick access to these items. The equivalent in CIT is creating a dashboard.

Selecting the Control Mode

Before starting to tune your vehicle's performance, you must select which control mode to use. Set
the Control Mode Select parameter = 0 (Speed Mode Express for traction motors), or = 1 (Speed
Mode, for traction motors). Cycle KSI Off and then On (to clear any Parameter Change Faults) and
use the CIT/1313 Programmer app to check for faults in the controller. Clear any faults, and then
proceed to the tuning steps for the control mode selected.
Conduct the steps in the sequence given, because successive steps build upon the preceding steps.
Understanding these programmable parameters is necessary to take full advantage of the controller's
powerful features. See the descriptions of the applicable parameters in Chapter 4.
0 − Speed Mode Express Tuning
Speed Mode Express is the same as Speed Mode with the exception that it has fewer parameters
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and is therefore simpler to use. Most vehicle applications will find success with Speed Mode
Speed Mode Express p.51
Express; however, for some applications vehicle performance cannot be satisfactorily fine-tuned
in Speed Mode Express. In this case, change the control mode to Speed Mode (i.e., set Control
Mode Select =1).
0.1 Set the Pump Enable and Regen Lower Enable parameters to Off (do not have the pump turn on
0.2 Adjust Max Speed to the maximum speed the traction motor should turn in the vehicle
0.3 Adjust Typical Max Speed to the approximate maximum speed that the motor will spin. This is
0.4 Kp and Ki typically do not need to be changed as the default values will work well in most
0.5 Adjust the Accel Rate and Decel Rate as necessary while moving the throttle to different positions
6 — COMMISSIONING

AC MOTOR TUNING GUIDE

during the traction motor tuning).
application; this speed setting corresponds to an input of full (100%) throttle.
usually the same value as the setting for Max Speed, but some applications have a Max_Speed_
SpdMx that changes (in the VCL software). If the Max_Speed_SpdMx changes, set Typical Max
Speed to the highest speed the motor is expected to reach. This value does not need to be set
precisely since it will not change motor performance. Typical Max Speed sets a reference point
for the "rate" parameters (accel, decel, brake rates), so that applications that have a changing
Max_Speed_SpdMx will not experience changes in the rates (because the rates are referenced
to the unchanging Typical Max Speed value). Once the Typical Max Speed parameter is set, do
not readjust it without adjusting all the rate parameters as well.
applications. If you want to adjust Kp (for looser or tighter following of the speed trajectory
set by the accel, decel, and brake rates), follow the procedure in step "1.4" in the Speed Mode
tuning section.
(i.e., neutral to full throttle, half throttle to full throttle, full throttle to half throttle, full throttle
to neutral, neutral to low throttle, etc.).
Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022
pg. 187