6-15
·Feedback-value Integral PID Control
Inthiscontrol,thefeedbackintegralvalueisused.TheInverternormallyusesthiscon-
trol method. The response will be comparatively slow if the target value changes
because the feedback integral value is used. The stable control of the target is, how-
ever, possible.
Target value
Target of
control
Detected value (Feedback value)
·Basic PID Control
Thisisthebasiccontrolmethod.Theresponsewillbequickifthetargetvaluechanges
because the deviation integral value is used. If the target value changes rapidly, how-
ever, the control value of the derivative control block will be large. As a result, over-
shooting or undershooting may result.
Target value
Target of
control
Detected value (Feedback value)
·Furthermore,3G3MVInvertercanadd the frequencyreference to the operation result
of the PID control block.
Ifthetargetofcontrolismotorspeed,by addingthefrequencyreference,motorspeed
control with high-speed response will be possible.
Do not add the frequency reference if the target of control is temperature or pressure.
Advanced Operation Chapter 6
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