Wesley BC-620-4CA - Manual (Page 85)

Curtis 1234/36/38 Manual,
OS
11 81
2 3 J U LY 2 0 0 8 D R A F T
6 — TUNING GUIDE
Speed parameter you should not readjust it without adjusting all the rate
parameters as well.
d. Kp and Ki typically do not need to be changed as the default values will
work well in most 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 “d” in the Speed Mode tuning section.
e. Adjust the Accel Rate and Decel Rate as necessary while moving the throttle
to different positions (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.). For AC pump applications, typically the Accel Rate and Decel Rate
are set very fast for quick response to hydraulic inputs.
f. Adjust the Brake Rate as necessary while reversing the throttle input (i.e., full
throttle forward to low throttle reverse, full throttle forward to full throttle
reverse, full throttle reverse to low throttle forward, etc.). If a brake input
is present in the application (Brake Pedal Enable = On) continue adjusting
Brake Rate by applying different amounts of brake throttle (i.e., full throttle
forward, then apply full brake or full throttle forward, then apply low brake,
etc.). For AC pump applications the Brake Rate has no effect on performance
since the AC pump will not run in reverse nor with a brake input.
AC pump motor applications, which in step “a” had the Pump Enable parameter
set to On, may also be controlling hydraulic valves (load hold valve, proportional
valve). The Proportional Driver parameters (page 50) and some VCL will typi-
cally be used to set up the control of these valve driver outputs. Consult with
your Curtis customer support engineer regarding hydraulic valve control.
1 -
SPEED MODE tuning (see pages 29–34 and 39)
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 the 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_SpdM that changes (in
the VCL software). If the Max_Speed_SpdM changes, set the 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. Typi-
cal Max Speed sets a reference point for the “rate” parameters (accel, decel,
brake rates), so that applications that have a changing Max_Speed_SpdM
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
Speed parameter you should not readjust it without adjusting all the rate
parameters as well.
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