Curtis 1238SE - Page 99

9 — TUNING GUIDE
pg. 95
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
• Cycle KSI to clear any faults. en, assert (close) the Interlock.
• Using very quick, pulsing throttle movements, increase the throttle and then
release it to 0%. e intent is to give the speed controller torque impulses.
• Increase Kp and repeat the throttle tests. Increase Kp until you start to notice
marginal stability (normally motor bouncing, or continuous oscillation
in the gears, is heard). Note: It is possible that very heavy vehicles will not
experience marginal stability even at the highest setting of Kp.
• Once the Kp setting for marginal stability is found, reduce the Kp value
by about one third (i.e., nal Kp = marginal stability Kp * 2/3).
• If you will be using Speed Mode Express, enter this Kp value for
the Kp parameter in the Speed Mode Express menu.
• Set the Max Speed, Accel/Decel, So Stop Speed, Position Hold,
and Brake Type parameters back to their original values.
e. In the Speed Mode » Response menu, adjust the ve Accel and Decel Rate
parameters as necessary while moving the throttle to dierent 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, these
parameters are typically set very fast for quick response to hydraulic inputs.
f. In the Speed Mode » Response menu, adjust the remaining three brake rate parameters 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
these three brake rates by applying dierent 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 these parameters have no eect on performance
since the AC pump will not run in reverse nor with a brake input.
g. e parameters in the Speed Mode » Response » Fine Tuning menu typically do
not need to be changed as the default values work well in most applications.
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). e Proportional Driver
parameters (page 53) and some VCL will typically be used to set up the control of these valve
driver outputs. Consult with your Curtis distributor or support engineer regarding hydraulic
valve control.
WARNING
Quick Links:
Speed Mode menu p.32
Speed Controller menu p.32
Max Speed
Kp
Ki (LS/HS)
Response menu p.35
Accel Rate
Decel Rate
Brake Rate
Restraint menu p.37
So Stop Speed
Position Hold
menu p.38