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4.11 SELECTING PROPORTIONAL BAND P.BND
Proportional Band P.BND is not active unless your meter has analog output and relay
capabilities. The menu will display whether analog output is present or not.
• A proportional controller's output is linearly proportional to the change of the
error signal, whenever the signal is within 2 prescribed values (Proportional
Band).
• There are three (3) points of interest on the proportional controller transfer
curve.
• The first is the magnitude of the error signal that drives the controller to
“full on
” (e.g. 20 mA out for 4-20 mA).
Figure 4-2. Controller Output
• The second point of interest is the magnitude of the error signal that drives
the controller output to “full off” (e.g. 4 mA out on 4-20 mA). These two (2)
points need not be equally spaced on either side of the zero error point.
• The third is the factor "Offset" and it is the output value of the
controller which causes zero error.
The above example illustrates the parameters for the 4-20 mA analog out,
likewise, analog voltage output will have these (3) points of interest.
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