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[4] A 3−15 psi output range, direct acting P+I controller has a process under control and is outputting 7 psi. Its gain
Posted: Thu Jul 14, 2022 2:38 pm
by answerhappygod
- 4 A 3 15 Psi Output Range Direct Acting P I Controller Has A Process Under Control And Is Outputting 7 Psi Its Gain 1 (65.95 KiB) Viewed 66 times
[4] A 3−15 psi output range, direct acting P+I controller has a process under control and is outputting 7 psi. Its gain is set at 0.5 and its integral time at 35 seconds. A shock load instantaneously increases the transmitter signal by 2 psi. Assuming there is no significant change in transmitter input for the next two minutes, list the controller output at 35 and 105 seconds after the disturbance. P=KC(c−r)+TiKC∫(c−r)dt+P0 Where: P - controller output pressure in psi; P0− 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;15 psi when set level =100 ) Ti - the reset time P(35)=0.5×2+0.5/35×2×35+7P(35)=1+1+7P(35)=9psiP(105)=0.5×2+0.5/35×2×105+7P(105)=1+3+7P(105)=11psi