Wesley BC-620-4CA - Manual (Page 84)

80 Curtis 1234/36/38 Manual,
OS
11
TUNING GUIDE
Many aspects of vehicle performance can be optimized, using the wide variety
of adjustable parameters available to the 1234/36/38 controllers. Once a ve-
hicle/motor/controller combination has been tuned, the parameter values can
be made 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 tuned
again to provide optimum performance.
Selecting the control mode (see page 27)
Before starting to tune your vehicle’s performance, you must select which con-
trol mode you use. Set the Control Mode Select parameter = 0 (Speed Mode
Express for either traction or pump motors), = 1 (Speed Mode, for either trac-
tion or pump motors) or = 2 (Torque Mode, for traction motors). Cycle KSI
input Off and then On (to clear any parameter change faults) and use the 1311
to check for faults in the controller. Then proceed to the tuning steps for the
control mode you have selected.
Conduct the steps in the sequence given, because successive steps build
upon the ones before. It is important that the effect of these programmable
parameters be understood in order to take full advantage of the 1234/36/38’s
powerful features. Please refer to the descriptions of the applicable parameters
in Section 3 if there is any question about what any of them do.
0 -
SPEED MODE EXPRESS tuning (see page 28)
Speed Mode Express is the same as Speed Mode with the exception that it has
fewer parameters and is therefore simpler to use. Most vehicle applications will
find success with Speed Mode Express; however, for some applications vehicle
performance cannot be satisfactorily fine-tuned in Speed Mode Express. In
this case, change your control mode to Speed Mode (i.e., set Control Mode
Select =1).
a. For traction applications, set Pump Enable to Off. For AC pump applica-
tions, set this parameter On.
b. Adjust Max Speed to the maximum speed the motor should turn in the vehicle
application; this speed setting corresponds to an input of full throttle.
c. Adjust Typical Max Speed (page 53) to the approximate maximum speed
that the motor will spin. This is 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 you set the Typical Max
6 — TUNING GUIDE
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