
Parker Hannifin
16 Programmer’s Guide
Servo Tuning - Tutorial
The tuning process lets you hone the servo response and settling for
your particular system.
Settling and responsiveness are the main components that
determine performance. Generally, the goal of servo tuning is good
settling, with a secondary goal of good responsiveness. Ultimately,
only you can determine which aspect is of prime importance, and
when the tuning is “good enough” for your system.
For safety, tune the servo system unloaded. Once the servo is stable
and responsive, then add the load and tune the servo again.
NOTE: Because the differences between systems are wide, the
following are provided only as guidelines.
Proportional and derivative gains work against each other—an
increase to one gain affects the other. With this in mind, treat tuning
as an iterative process: alternate between adjusting proportional
and derivative gains.
• PGAIN: Adjusts servo response. You can always try to increase
responsiveness, though mechanics ultimately limit response
time.
• DGAIN: Adjusts settling time. The goal is always good settling.
• IGAIN: Adjusts steady-state errors (not discussed in this tutorial).
Adding integral gain also increases responsiveness, though the
increase might not be noticeable.
Warning — When tuning a servo motor, remove all loads from
the motor to prevent personal injury or mechanical
destruction. Once tuning provides a stable and responsive
servo motor, you can attach the load and start the tuning
process again.
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