N700 Operating Instructions and Parts Manual
11. Explanation of C-Group
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(4) The adjustment of PID gain
Please adjust each according to the state as the following, when the response on the
functional operation PID is not stable.
①
In spite of changing command, the change of feedback signal is slow.
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Increase P gain.
②
The feedback signal changes instantly but is not stable.
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Decrease P gain.
③
The command and feedback signal doesn’t coincide instantly.
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Decrease I gain.
④
The feedback signal oscillates and is not stable.
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Increase I gain.
⑤
In spite of raising of P gain, the response is slow.
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Increase D gain.
⑥
When P gain is raised, the feedback signal oscillates and is not stable.
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Decrease D gain.
(5) The Maximum PID Deviation Level / Output
①
It is possible to establish the maximum deviation level o029 on PID control.
When the PID deviation amount reaches the set level o029, it is possible to set an
intelligent output.
o029 can be set from 0 to 100.0% and corresponds with the command from 0 to
maximum.
②
Assign 04 (OD) to an intelligent output terminal 1~4 (o001~o004).
(6) Feedback monitor of PID
①
Feedback signal of PID can be monitored.
②
The monitor value can be displayed by the product of PID scale C026.
"Monitor DISPLAY " = Feedback (%) × PID feedback gain(C026)
(7) PID integral reset
①
This is the function to clear the integral value of PID action.
②
Assign 22(PIDC) to an intelligent input terminal.
③
It is cleared whenever PIDC is turned ON.
Don't turn absolutely ON PID terminal during PID action, because there is a possibility of
overcurrent trip. Turn ON PIDC terminal after turning OFF PID action.