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Gain (J03)
Sets the gain for the PID processor.
- Data setting range: 0.000 to 10.00
u (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 value 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.
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