Despatch MIC1422 Controller Manuel d'utilisateur télécharger pdf (Page 64)

New instruments supplied by the factory contain PID terms set at "DEFAULT" values

which have been found to give adequate and safe control over a wide range of

applications. In the "Pre-Tune" mode of operation, the "default" PID terms are loaded

and the controller demands 100% power until the process value has moved

approximately halfway to the setpoint. At that point, power is removed thereby

introducing a deviation oscillation. Once the oscillation peak has passed, the Pre-Tune

algorithm can calculate its first approximation to the optimum PID values. The power is

reapplied using new values. This technique limits possibility of setpoint overshoot when

the instrument is new or the application has been changed.

FIGURE 12-1

FIGURE 12-2

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Despatch MIC1422 Controller Manuel d'utilisateur Page 64