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Installation, Operation, and Maintenance Manual
ES-09373-1
Principle of Operation
The PD100 smart positioner is powered by the 4-20 mA loop, with the control signal.
The supply air is connected to the inlet on the manifold and passes though the
pneumatic spool valve that controls the valve position.
The air passes through the Pressure Regulator and reaches the I / P Converter.
The valve position is detected through the Position Feedback Sensor (Hall effect
sensor) and transmitted to the electronic board ( Main Microprocessor).
The fast microprocessor compares the control signal and the position feedback, and
the difference is the input to the PID controller that will generate an appropriate signal
(in frequency) to be applied to the coil of the I/P converter.
The I / P Converter is the nozzle / vane that generates a pressure signal to the
Diaphragm Module that will create a dynamic force on the spring that breaks the
balance of the spool valve, that then moves the valve to the new required position.The
microcontroller repeats the process and when the difference between the requested
position signal and the actual position feedback trends to zero, the interference of the
Diaphragm Module will cease and there will be a new balance on the spool valve, and
the valve will reach the new position.
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Principle of Operation
August 17, 2022
Principle of Operation
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