Note 1) PID feedback control
The PID(Proportional, Integral, Differential) control functions can apply to
controlling of fan, the air (water) amount of pump, etc., as well as controlling
of pressure within a fixed value.
[Input method of target value signal and feedback signal]
Set the reference signal according to the frequency setting method or the internal
level.
Set the feedback signal according to the analog voltage input (0 to 10V) or analog
current input (4 to 20mA).
If both input signal (target value and feedback value) set the same terminal,
PID control is not available.
To use analog current [OI-L] for the target value, set the [AT] terminal to ON.
[PID gain adjustment]
If the response is not stabilized in a PID control operation, adjust the gains as
follows according to the symptom of the inverter.
¡The change of controlled variable is slow even when the target value is changed.
¡ Increase P gain [A47]
¡The change of controlled variable is fast, but not stable.
¡ Decrease P gain[A47]
¡It is difficult to make the target value match with the controlled variable.
¡ Decrease I gain [A48]
¡Both the target value and the controlled variable are not stable.
¡ Increase I gain [A48]
¡The response is slow even when the P gain is increased.
¡ Increase D gain[A49]
¡The response is not stabilized due to oscillation even when the P gain is increased.
¡ Decrease D gain[A49]
The figure below is a more detailed diagram of the PID control.
Target value
operator
multi-speed
Volume
analog votage input
analog current input
A62/64
F01
P
A47
I
A48
D
A49
Feedback value
analog votage input
analog current input
analog iput
setting
A05-A08
A64/62
monitor
d05
Frequency
setting
9-14
A50
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ENDA E-100
INSTRUCTION MANUAL
