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Pressure Control

EWM-P-AA - Digital card for pressure and force control in closed-loop systems

EWM-P-AA - Digital card for pressure and force control in closed-loop systems

EWM-P-AA card is designed for pressure control servo pumps. It manages closed-loop control of pressure reducing and pressure relief valves.

The card works as a bypass control module. The command value is directly transferred to the control output (pressure valve), and the closed-loop compensates only the linearity failures. In most cases, the optimization is possible without any measuring instruments (only a pressure sensor is necessary).

It has an integrated power amplifier for direct control of proportional valves. The card is only set up via software through a USB-B port.

Available customizable parameters are: ramp up, ramp down, PID parameters, dither, frequency and amplitude, PWM, maximum and minimum pressure.
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EWM-PQ-AA - Digital card for pressure/flow control in closed-loop systems

EWM-PQ-AA - Digital card for pressure/flow control in closed-loop systems

EWM-PQ-AA has been developed as a classic p/Q controller, but it also works well with high response valves via an analog command input for pressure and flow.

The p/Q controller automatically switches between Q and p control modes to assure that the setpoint limits for P have not been exceeded.

The pressure feedback is an analog type. The card uses the RS232C interface, and it can be set via a notebook, using the software kit EWMPC.

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