Case for the control of hydraulic actuators with SSI feedback in the closed ring The EWM-S-D digital card allows an extremely precise positioning of hydraulic actuators equipped with digital position sensor with SSI interface in closed ring systems. The card controls a proportional directional valve with integrated electronics and allows you to make the most of the valves proportional to positive or null -covered covering. The output value, in tension or current, must be configured via software. There are an entrance for an external speed command and an additional entrance to analog sensors.  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.