[4] A 3−15 psi output range, direct acting P+ I controller has a process under control and is outputting 5 psi. Its gain

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4 A 3 15 Psi Output Range Direct Acting P I Controller Has A Process Under Control And Is Outputting 5 Psi Its Gain 1 (30.03 KiB) Viewed 39 times

[4] A 3−15 psi output range, direct acting P+ I controller has a process under control and is outputting 5 psi. Its gain is set at 0.6 and its integral time at 45 seconds. A shock load instantaneously increases the transmïtter signal by 1.5 psi. Assuming there is no significant change in transmitter input for the next two minutes, list the controller output at 60 and 90 seconds after the disturbance. P=KC​(c−r)+Tf​KC​​∫(c−r)dt+P0​ Where : P - controller output pressure in psi; Po - initial or "base point" controller output pressure in psi; Kc - controller gain (positive for direct action, negative for reverse action); c - transmitter output in psi; r - setpoint transmitter output in psi ( 3 psi when set level =0;15psi when set level =100 ) Ti− the reset time