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*Construction and principle of operation
The Witronic II controller is an electronic three-position controller for dirext control of motor actuators or other motorised final contid elements.The controller consist basicaly of three modules,these are:
-input circuitry
-output circuitry and feedback,which are mounted on a seperate printed circuit board
The mV input to the controller,produced by the diffirent primary elements is the proces variable X.This value X is compared with the reference value
W(set-value) from within the instrument and any diference resulting from this comparasion is the error signal Xw.The filter circuit(4)short circuits any stray A.C. voltages.The integrated preamplifier(5) with an extremly low temperature drift amplifies the deviation indicator(6).If the error signal Xw is very small(I.E.) within neutral zone Fig.2,there is no output from control amplifier.This amlified signal is fed to the fet control amplifier(7).With no output from the control amplifier neither of the two trigger circuits(9,10) is active,and both output relays(13,14)are in the DE-ENERGIZED state.
Y--Correcting
Y11--Motor opens valve
Y12-Y21--Motor stationary
Y22--Motor closes valve
X--Process variable
W--Set-value
Xsh--Neutral zone
Hvala UNAPRIJED...
*Construction and principle of operation
The Witronic II controller is an electronic three-position controller for dirext control of motor actuators or other motorised final contid elements.The controller consist basicaly of three modules,these are:
-input circuitry
-output circuitry and feedback,which are mounted on a seperate printed circuit board
The mV input to the controller,produced by the diffirent primary elements is the proces variable X.This value X is compared with the reference value
W(set-value) from within the instrument and any diference resulting from this comparasion is the error signal Xw.The filter circuit(4)short circuits any stray A.C. voltages.The integrated preamplifier(5) with an extremly low temperature drift amplifies the deviation indicator(6).If the error signal Xw is very small(I.E.) within neutral zone Fig.2,there is no output from control amplifier.This amlified signal is fed to the fet control amplifier(7).With no output from the control amplifier neither of the two trigger circuits(9,10) is active,and both output relays(13,14)are in the DE-ENERGIZED state.
Y--Correcting
Y11--Motor opens valve
Y12-Y21--Motor stationary
Y22--Motor closes valve
X--Process variable
W--Set-value
Xsh--Neutral zone
Hvala UNAPRIJED...