122-28176 Parallax Inc, 122-28176 Datasheet - Page 294

• 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

Consider Figure 8-14a, which has a proportional band of 100%, and a K
that 100% of the drive is controlled over 100% of the control band. This is known as a
100% Proportional Band of Control. Gain is 1 because it is:
Now consider Figure 8-14b. 100% of the drive is controlled over only 50% of the control
band. This is termed a 50% Proportional Band and has a gain of:
Gain and Proportional Band are actually inverses of one another. They are two different
ways of discussing the same concept.
Applying Proportional Drive
It's time to apply the theory to practice and see the response of the system. For this run
we want to be at the temperature that relates to a 50% bias drive.
Figure 8-14: 100% Proportional Band (a) and 50% Proportional Band (b)
K
K
P
P
= ∆Output/∆Input = 100%/100% = 1
= ∆Output/∆Input = 100%/50% = 2
a
b
P
of 1. It shows