Toshiba VF-S15 Instruction Manual page 194

f363 (I-gain adjustment parameter)
6
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f366 (D-gain adjustment parameter)
Previous deviation-current deviation
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This parameter adjusts the integral gain level during PID control. Any remaining deviations (residual
deviation offset) during proportional action are cleared to zero.
A larger I-gain adjustment value reduces residual deviations. Too large an adjustment value, however,
results in an unstable event such as hunting.
Feedback value
Assign function number 52 (PID integral/derivative clear) to an input terminal. It is possible to calculate
integral/derivative amounts always as 0 (zero) while the input terminal is ON.
This parameter adjusts the differential gain level during PID control. This gain increases the speed of
response to a rapid change in deviation (difference between the process value and the feedback value).
Note that setting the gain beyond necessity may cause fluctuations in output frequency, and thus
operation to become unstable.
Feedback value
Assign function number 52 (PID integral/derivative clear) to an input terminal, and it is possible to
calculate integral/derivative amounts always as 0 (zero) while the input terminal is ON,.
(f363=
Small gain)
(f363=
Residual deviation
Large gain)
Time
High differential gain
F-82
E6581611
Process value
Low differential gain
Time