Process Controls CONTROL LOOP DIAGRAMSConstant amplitude (Figure 10B). Action of the controller sustains oscillations of the controlledvariable. The controlled variable will never reach a stable condition; therefore, this condition isnot desired.Increasing amplitude (Figure 10C). The control system not only sustains oscillations but alsoincreases them. The control element has reached its full travel limits and causes the process togo out of control.Rev. 0 Page 15 IC-07
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