Pid Control Adjustment; Summary Of Adjustment; Fundamental Adjustment (Common); Proportional (P) Gain - Toshiba TOSVERT VF-S15 Instruction Manual

5. PID control adjustment

5.1. Summary of adjustment

<In case with the estimate of PID gain>
Set the estimated value of PID gain and check the operation of the system.
Adjust the gain if necessary.
<In case without the estimate of PID gain>
1) First, operate the inverter by default setting gain and check the operation of the system.
2) Adjust the fundamental gain.
(1) Adjust the proportional (P) gain if the response is delayed.
(2) Adjust the integral (I) gain if the unstable condition continues.
(3) Adjust the differential (D) gain if the system always changes or continues unstable condition
even after PI gain adjustment.
3) Apply further adjustment for stability if necessary.
* Adjust the delay filter to stabilize the speed PID control.

5.2. Fundamental adjustment (common)

The fundamental gain of PID control adjusted according to the system.

（Hz）
x
Symbol Title
f362
Kp
f363
Ki
f366
Kd

5.2.1. Proportional (P) gain

Set the proportional (P) gain of PID control by f362.
The proportional (P) gain, a factor gained by multiplying the deviation (difference between the process
value and the feedback value), is used to perform control so as to make a correction in proportion to the
deviation. Although larger gain is effective for quicker response, excessively high gain may cause an
unstable operation including vibration.
PID control

    
y Kp x Ki x dt
Function
Proportional gain
Integral gain
Differential gain

d x
（Hz）
y
Kd
dt
PID output frequency
Set value
f362=1.0: Kp =1.0
f363=1.0: Ki =1.0（s
f366=1.0: Kd =1.0（s）
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