Feedback

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# Feedback - PowerPoint PPT Presentation

Feedback. Feedback loop (CV changes input). + -. E. Controller Gc. Plant Gp. SP. MV (Manipulated Variable. S. Sensor Gs. CV Controlled Variable. The input of each block determines the output. CV = Gp (s)*MV. Plant Gp. MV

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## PowerPoint Slideshow about ' Feedback' - reya

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Presentation Transcript

### Feedback

Feedback loop (CV changes input)

+

-

E

Controller Gc

PlantGp

SP

MV

(Manipulated Variable

S

SensorGs

CV

Controlled Variable

The input of each block determines the output
• CV = Gp(s)*MV

PlantGp

MV

(Manipulated Variable

CV

Controlled Variable

MV = Gc E

E

Controller Gc

MV

(Manipulated Variable

Combine blocks
• CV = Gp*Gc*E

E

Controller Gc

PlantGp

MV

(Manipulated Variable

CV

Controlled Variable

E = SP – S

• S = Gs*CV or E = SP – Gs*CV

+

-

E

SP

S

SensorGs

CV

Controlled Variable

Do the math to get the “closed loop” transfer function
• CV = Gp*Gc*E
• E = SP – Gs*CV
• CV = Gp*Gc*(SP – Gs*CV)
• Solve for CV