Case for the control of the position of hydraulic actuators with analogue feedback in the closed ring The EWM-ST-AA digital card is designed for the control of the hydraulic actuators race equipped with analogue position sensors in closed ring systems, with specific functions for steam turbine systems. It is available with current output or with integrated power amplifier. There are an entrance for an external speed command and an exit monitor to the DCS. To configure it, the EWMPC/20 software is needed, downloadable on this page. Connection with USB port on the front. The manuals are available upon registration for the reserved area.