Question
Explain the working of an electronic P.I.D. controller.
Answers
Input from the mesurement transmitter is compared with the set point voltage to produce a deviation signal. The deviation signal is combined with a characterized feed back signal to provide the input for the function generator amplifier. This amplifiers output is delivered to the feed back network, and to the final output which is a 10-50m.a. do signal for actualation of final operators.

PROPN ACTION : It is a obtained by adjusting the magnitude of feed back signal. An increase in negative feed back means less effective gain and thus a broader proportional band.

REST ACTION : It is obtained by charging the reset capaciter at a rate determined by the value of reset resister. The reset resister is variable, and constitutes reset adjustment.

DERIVATIVE ACTION : The connection of a derivative capaciter across the feedback circuit delays feedback until the capaciter is charged to a value approaching amplifier output. This delay is controlled by value of derivative resister. This resister is variable and constitutes derivative adjustment.   Your Comment




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