Integral (I) Gain; Differential (D) Gain - Toshiba TOSVERT VF-S15 Instruction Manual

Output frequency
High proportional
gain f362
Quick response

5.2.2. Integral (I) gain

Set the integral (I) gain of PID control by f363.
The integral gain reduces the deviation remaining after proportional control (residual deviation offset) to
zero.
Although larger gain reduces the residual deviation, excessively high gain may cause an unstable
operation including vibration.
Output frequency

5.2.3. Differential (D) gain

Set the differential (D) gain of PID control by f366.
The differential gain increases the response speed in case of radical change in deviation.
However, excessively high gain may cause instability including ,considerable fluctuations of output
frequency.
Previous deviation
－Current deviation
Output frequency
Low proportional
gain f362
Slow response
Low integral gain f363
Residual deviation
High integral gain f363
High differential gain
Low differential gain
19
Process value reference
Time
Process value reference
Time
Time
Time
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