Alternative to PID
Alternative to PID
(OP)
Many years ago I used a Ramsey controller they called Pulsed Error. The application was controlling the power draw of a crusher located after a vibrating screen. We tried without success to replace the controller with a more modern PID but it never came close to achieving the same results.
Are there other alternatives to PID besides Fuzzy Logic?
Roy
Are there other alternatives to PID besides Fuzzy Logic?
Roy





RE: Alternative to PID
Maybe for the rock crusher they sense motor currents and underexcite the motor when no crushing is happening (phase controlled SCRs).
RE: Alternative to PID
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RE: Alternative to PID
Unlike a PID where the Integral term would continue ramping the output to reduce the error, the Pulsed Error controller made no change to the output until a timer (e.g. 25 seconds) had expired. The 4-20 mA was derived from a motorized potentiometer.
From memory the controller had only 2 settings, Proportional and Time delay.
Sreid, The crusher was part of 100,000 t/d plant. The controller setpoint would typically be 95-98% of motor nameplate kW and they would run non-stop for several weeks between maintenance shutdowns.
Dcasto, I think you may have posted the wrong link.
This is the only time I have seen that type of control although I have sometimes copied the "wait and see" strategy in PLC logic.
Roy
RE: Alternative to PID
RE: Alternative to PID