The EWM-P-AA is used to closed loop control of pressure reducing and pressure relief valves. The card integrates also an embedded power amplifier for a direct control of proportional valves.
This 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 of cases the optimization is possible without any measuring instruments (only one manometer is necessary).
The card allows to set the following parameters: ramp up, ramp down, PID parameters, dither, frequency and amplitude, PWM, maximum and minimum pressure.
The card use the RS232C interface, and is settable via notebook, using the software kit (EWMPC).