385 W W Pressure sensor Feedback loop Regulated pressure 0.05 - 10 bar Exhaust Differential amplifier Pulse width modulated 2-way solenoid valves Servo-chamber U/I - Control signal 0-10 V, 4-20 mA Sensor output signals 0-10 V, 4-20 mA 0-24 V, Alarm P R R A P 24 V DC - + U PID PLC 24 V A B U Out Remote display PC Calys software EPP4 Series Parker Hannifin Corporation Fluid Control Solutions Europe General Catalogue FCSE/0112/UK V2.2 07/2022 Block Diagram The controller receives both the control signal (set pressure) and the feedback signal from the sensor (outlet pressure). Any difference between the two amplifier inputs results in a corresponding output which drives the appropriate 2-way pulse width modulated solenoid valve so that the pilot piston moves to correct the pressure. The same feedback signal from the sensor is used for the output feedback in voltage and current. The digital signal (alarm) is activated when the conditions (out of pressure or time tolerance) are met. EPP4 possible executions : Basic and Comfort EPP4 Basic and Comfort ranges share the same reliable mechanical parts. Proportional regulation is also identical for the two different executions, giving the same characteristics for hysteresis or precision for instance. Comfort range regulators have a second M12 connector, that can be used to connect a remote display showing the current regulated pressure, or a PC to easily set the regulation's parameters. These are the key feature options for a comfortable use. The B connector offers connection to the remote display or the PC.
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