Toshiba Tosvert VF-S15 Instruction Manual page 197

f363 (I-gain adjustment parameter)
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.
f366 (D-gain adjustment parameter)
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 PID set value and the feedback value).
Note that setting the gain beyond necessity may cause fluctuations in output frequency, and thus
operation to become unstable.
Previous deviation-current deviation
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-85
E6582175
PID set value
Low differential gain
6
Time