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Description of Control Parameters
Manual Tuning Guideline
Description of Control Parameters
The FVP110's basic method of controlling the valve position is PI-D control. This control
is characterized by the fact that a rapid output change is prevented by the derivative
term of D being added to the feedback.
In addition, FVP110 has a boost function that serves as an output acceleration function
after an input change, because it compensates the nonlinearity caused by the structure
of a valve or FVP.
When you set these parameters, change the mode of the transducer block and AO
function block to O/S.
SERVO_GAIN
Tuning range: 0.1 to 1300 (Default: 120)
Set the loop gain of PI-D control.
The proportional gain of PI-D control increases in proportion to (SERVO_GAIN /
INTERNAL_GAIN).
If you increase the value for SERVO_GAIN, tracking capability tends to increase,
whereas control stability tends to decrease.
SERVO_RESET
Tuning range: 0, 2 to 50 sec (Default: 15 sec)
Set the integral time of PI-D control.
The pace of change in integral volume quickens in reverse proportion to the integral
time and the volume changes repeatedly until the deviation disappears.
If you set a:
❑ Smaller value for the integral time, the deviation disappears more quickly,
whereas fast accumulation of integral components may cause an overshoot.
❑ Larger value for the integral time, you can reduce the accumulation of excessive
integral components when the deviation is large, but it takes longer for the
deviation to disappear.
❑ 0, this function is invalid.
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