28176 Parallax Inc, 28176 Datasheet - Page 293
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
Specifications of 28176
Accessory Type
Process Control
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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With a gain of 3, and an error of 30%:
Note that the greater the error, the greater the drive due to proportional control. Consider
what this means to our incubator. Let's assume a bias of 50% only got the temperature to
99.7F. This would produce an error of +30% for a total drive of 80% (with a K
With a PWM duty cycle of 80%, what will the temperature in the incubator do? Increase.
As the actual temperature approaches the setpoint, what happens to the proportional
drive? It becomes less and less, backing off on total drive. Consider when temperature is
at 99.9 °F. The error is +10%. What does this do for total drive?
Notice that as the temperature approaches the setpoint, the drive is less. This may result
in the temperature stabilizing below the setpoint, which is called steady-state error.
Proportional Band
Let's consider one more term: Proportional Band. Actually, we've already discussed all
there is to know. It's simply another way of looking at the gain. Proportional band
defines the percentage of the control band over which the system will take proportional
control action.
%Drive
%Drive
%Drive
%Drive
PROP
PROP
TOTAL
TOTAL
= K
= K
= %Drive
= %Drive
P
P
%E = 1 x 30% = 30%
%E = 3 x 30% = 90%
BIAS
BIAS
+% Drive
+% Drive
PROP
PROP
= 50% + 30% = 80%
= 50% + 10% = 60%.
P
of 1).
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