INVERTER,S PID FUNCTION (pid control application and pid control actions )


SPEED CONTROL take the mechanical speed signal as feedback signal.make the speed conform with target value..take the other mechanical speed signal as target value input, and actual speed as feedback signal to effect simultaneous control.
PRESSURE CONTROL.pressure signal is feedback signal , control pressure according to the set value.
FLOW CONTROL. control flow precision by taking flow signal as feedback signal.
TEMPERATURE CONTROL . temperature signal is the feedback ,the temperature is controlled by controlling the fan,s operations.
NOTE: the pid control function is a control system that matches a feedback value(i,e,,,.a detected value ) to the set target value . combining proportional (p), integral  (i), and derivative (d)control makes control possible even for a mechanical system with dead time . this action explains the pid control applications and operations,along with the constant settings and tuning procedure.

in order to distinguish the separate pid control operations (i,e,,proportional, integral, and derivative), the following figure shows the changes in the control input ( i,e,the output frequency)when the deviation between the target value and the feedback are held constant..p control: control input proportional to the deviation is output. the deviation cannot be zeroed by p control alone, i control: a control input which is an integral of the deviation is output , this is effective for matching the feedback to the target value . sudden changes , however , be followed.
D CONTROL: a control input which is an integral of the deviation is output, quick response to sudden changes are possible.
PID CONTROL: optimum control is achieved by combining the best features of p, i, and d control.

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