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54 Cards in this Set
- Front
- Back
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What are the parts of an optoisolator? |
Led and photosensitive device |
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What are optoisolators used for? |
To isolate input side from output through an air gap. |
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How do you calculate duty cycle? |
On time/cycle time |
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Differential gap vs oscillation amplitude? On off control |
Narrow gap, narrow oscillation. Wide gap, wider oscillation. |
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Differential gap vs oscillation frequency? |
Narrow gap, wider frequency. Wider gap, narrow frequency. |
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Differential gap vs actuator control? |
Has to go above or below gap in order for actuator to change. Inside deadband, no changes occur. |
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What's an advantage of proportional control over on/off control? |
Proportional control can keep a system stable. |
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Can on off control keep a system stable? |
No. |
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What unit is used to set the proportional band amount? |
Percent. % |
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What unit is used to set integral control amount? |
Seconds |
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What unit is used to see derivative control amount? |
Seconds |
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If a system is disturbed, which proportional band % would make the system respond faster? |
Narrower band. |
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What creates a more accurate response, even with wider band usage? |
Gain |
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What is under damped? |
Too narrow of a band |
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What does a system being under damped cause? |
Lots of oscillation. |
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If something is over damped, what does that mean? |
Too wide of a band |
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What does overdamping cause? |
Slow |
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What does something that is critically damped do? |
Responds fast as possible with little to no overshoot. |
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What determines full range? |
Lower limit plus upper limit |
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What control mode do you suppress for faster start up? |
Derivative control |
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What is burst mode control? |
Full AC going to a device, cycling on and off intermittently. Changing time in a cycle. |
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What is phase angle control? |
Adjusting the percent of each AC cycle. |
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Phase angle control is only for what? |
Solid state relays. |
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Which is faster, burst mode control, or phase angle control? |
Phase angle control. It's super speedy. |
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What is the resolution of a DAC determined by? |
Number of input bits. |
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How do you calculate ADC resolution? |
# of output bits |
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Bow do you find the decimal input range? |
2 to the #ofbits -1 |
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How do you find the current output range? |
Difference between highest and lowest output |
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How do you find the resolution of a DAC? |
Output range/input range. |
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What is a resolution? |
The amount the current changes by with the increase of one input. |
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Equation for ADC resolution? |
Input range/output range |
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What's output range on an ADC? |
2^#of bits -1 |
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Should you round up when calculating outputs? |
No, always round down. |
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What is hysteresis? |
Time lag between when actuator changes and the controlled variable changes. |
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What's the proportional band? |
A percentage of the full range. |
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Look over these |
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What is the equation for gain? |
1/proportional band |
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What is reset? |
Corrects for steady state error. |
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What is reset also known as? |
Integral action. |
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What does derivative control do? |
Corrects for sudden changes in the measured variable. |
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What is derivative control also known as? |
Rate. |
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What is differential gap also known as? |
Deadband |
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What is time proportioning? |
On off control. |
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What's the main purpose if integral control? |
To correct for offset or steady state error based in how long the error is measured. |
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What is derivative control? |
Corrects for sudden changes in measured variable. |
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How does integral control accomplish its purpose? |
By adjusting the proportional band. |
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How does derivative control accomplish its purpose? |
By shifting proportional band based on slope value. |
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Can integral or derivative control be used without proportional control? |
No. |
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When a proportional band is used, does the output of the controller shut off when the controlled variable reaches the set point? |
No. |
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What time proportioning method is used for DC? |
PWM |
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If the interval time for burst firing was set to 5 seconds, and the proportional output was 50%, how long would the AC be on during the five second interval? |
2.5 seconds. |
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As gain is increased, what happens to the proportional band? |
As gain increases, band decreases. |
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DC volt average? |
Duty cycle times voltage peak. +baseline |
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What is a differential gap? |
Time between oscillations. |
