Proportional (P) Gain; Integral (I) Gain; Differential (D) Gain - Toshiba TOSVERT VF-AS3 Instruction Manual

5. 2. 1
[F362] is the proportional (P) gain of PID1 control.
The proportional (P) gain, a factor gained by multiplying the deviation (difference between the set 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.
4
5
5. 2. 2
[F363] is the integral (I) gain of PID1 control.
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.
9
5. 2. 3
[F366] is the differential (D) gain of PID1 control.
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. Set
to 0.00 (default setting) normally.
5. PID control adjustment

Proportional (P) gain

Output frequency (Hz)
High
proportional
gain [F362]
Quick
response

Integral (I) gain

Output frequency (Hz)
Set value

Differential (D) gain

Deviation
Output by PID
differential
Low proportional gain [F362]
Slow response
High integral gain [F363]
Residual deviation
Low integral gain [F363]
High differential gain
Low differential gain
5-2
E6582112
Set value
Time (s)
Time (s)
Time (s)
Time (s)
VF-AS3