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9 Cards in this Set
- Front
- Back
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Two important devices of final control system ? |
Control valve: - used in majority of cases. - is often the weakest link in a control system when not selected or sized correctly Variable speed drive ( VSD) : used as a “ more efficient alternative” to the control valve. |
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Control valve includes what 3 major selections ? |
- Valve body - actuator ( fluid or electrical power ) - position controller & signal conversion |
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What’s a control valve ? |
Back (Definition) |
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Control valve “ transfer function “ Actuators are classified on the basis of the power source ? What’s a control valve actuator? |
1) Actuators classified by Pmeumatic, electrical & hydraulic 2) it’s used to translate the specific output signal from the controller into a position of a component that can exert a large amount of thrust of power |
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Valve action ? Fail-safe operation? |
Back (Definition)fg |
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Module 6 -> Controller Blocks ? & controller is used to? Feedback? Set-Point? |
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The 4 modes of control ? |
On/off Proportional Integral Derivative |
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ON/ OFF control ? Advantages & disadvantages of ON/OFF control? What’s happening in this example ? |
Output signal is fully on or off Pros: it’s simple, reliable, economical and outcome is relatively easy to predict Cons: continuous cycling & frequent starting and stopping |
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Proportional mode ? Purpose & how does it work? |
Proportional : The magnitude of the output signal |
