122-28176 Parallax Inc, 122-28176 Datasheet - Page 242
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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limit, full appropriate action is taken to drive the temperature to the opposite limit. Full
opposite action is then taken to drive the process back again. Figure 7-7 graphically
diagrams the action taken by differential-gap control. When the system is started and its
temperature is below the lower limit, the heater will come on and the temperature rise.
When the temperature passes the upper limit, the heater is turned OFF, heat will begin to
leave the process, and the temperature will begin to drop to below the lower limit. The
heat then is turned back on and the cycle begins again.
Notice how the diagram in Figure 7-8 differs from the earlier one depicting noisy data in
a simple on-off control mode.
Because the differential gap is wider than the effect of the noise, rapid cycling is
eliminated. These advantages come at the compromise of allowing the measured variable
to drift further from the desired “average” value. The thermal inertia of our system will
Figure 7-7
Differential Gap
(Hysteresis) Control
Graph
Figure 7-8
Effects of Noise on
Control Using
Differential-Gap
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