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What is the reason for the PV signal to drift from the SP value in a...

What is the reason for the PV signal to drift from the SP value in a feedforward system?

Group of answer choices

Delays caused by the feedforward loop

Change of phase of the Process Variable signal

Process Variable signal not taken into account

Process system becomes unstable

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Answer #1

The reason for the PV (Process Variable) signal to drift from the SP (Setpoint) value in a feed forward system is that

the Process Variable signal is not taken into account.

A feed forward system is used to prevent disturbances of the process from disturbing the control loop of a system. A detailed knowledge of the disturbances is required by both the designer and the operator.

A feed back system is meant to correct errors that occur and are detected in a closed loop system.

If we take into account the PV signal in a feed forward system then it becomes a feedback system.

The drifting of the PV in a feed forward system will have to be corrected manually from time to time or with additional feedback controls.

An optimal control system is one where both fee forward and feedback systems are used to eliminate the occurrence of disturbances and to eliminate them quickly if they are detected.

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