122-28176 Parallax Inc, 122-28176 Datasheet - Page 298
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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ACTIVITY #4: PROPORTIONAL CONTROL NOT AT BIAS TEMPERATURE
Parts required:
Same as Activity #1
While it seems pretty cut and dry that we can control at the setpoint using proportional
control, what happens when not operating at the temperature defined by a 50% bias
setting, or when a long-lasting disturbance affects the system equilibrium? In this
activity we will explore controlling at many degrees away from where bias alone would
be operating.
With a K
bias at 50%, the proportional drive had to be positive to drive temperature up. But the
Let's analyze the control response as seen in Figure 8-16.
Figure 8-16 Proportional Response not at 50% Bias Temperature
√
√
√
√
√
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Reset StampPlot.
Connect on StampPlot.
Set the Setpoint to a temperature distant from the temperature obtained with a
50% bias. In our case, we chose a temperature of 105 °F being 5 degrees away
from the 50% operating temperature.
Set a band of +/− 2.
Set Kp to 0.1 and allow to stabilize.
Repeat with gains of 0.5, 1.0 and 2.0.
P
of 0.1, temperature stabilized several degrees away from the setpoint. With
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