Fuji Electric frenic mini series, Руководство пользователя

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9.2 Details of Function Codes
9-59
Chap. 9
FUNCTI
ON C
O
DE
S
Gain (J03)
Sets the gain for the PID processor.
- Data setting range: 0.000 to 10.000
×
(times)
P (Proportional) control
An operation using an output
frequency proportional to deviation is
called P operation, which outputs an
operational amount proportional to
deviation, through it cannot eliminate
deviation alone.
Gain determines the system response level for the deviation in the P control. An increase in
gain speeds up response, an excessive gain can cause vibration, and a decrease in gain
delays response.
Integration time (J04)
Sets the integration time for the PID processor.
- Data setting range: 0.0 to 3600.0 (sec.)
I (Integral) control
The PID operation having the
proportional relationship of deviation
between the commanded (frequency)
rate (Hz/s) and control amounts is
called the I control. The I control
outputs the control amount proportional
to the integral amount of the deviation.
Therefore, it is effective for making the
feedback amount consistent with the
commanded one (such as frequency).
For the system whose deviation of
response rapidly changes, however, this
control cannot make the system react
quickly.
The effectiveness of I control is expressed by a parameter of integration time. The longer
the integration time, the slower the response. The reaction force of the system to an external
stimulus force becomes weak. The shorter integration time the faster response. Setting too
short integration time, however, makes the system tend to oscillate.