Product Description:

The EEA-PAM-533-D-30 is a plug-in power amplifier card manufactured by Vickers within the EEA-PAM Power Amplifiers series. The board conditions command and feedback signals so that proportional valves can be driven accurately in closed-loop hydraulic circuits used across industrial automation cells. It mounts on a standard Euro-card rail and provides interface points that isolate the machine controller from high-current spool solenoids.

The module is powered from a field supply of 24 V DC; this voltage energizes the output stages that drive the proportional valve coils. A separate control rail of +15 V feeds the internal signal conditioning circuits, keeping the analog pathways isolated from load transients. Command inputs are referenced to ±10 V at 5 mA, so a controller that can source or sink this small current can deliver the full stroke reference to the valve. The voltage command path presents 47 kΩ of input impedance, limiting loading on the upstream source, while the current summing node has 100 Ω so that a 4–20 mA signal can be read without significant error. The card measures 100 mm wide, 128.4 mm high, and 175.24 mm deep, allowing it to slide into a standard 3U rack position.

The feed-forward network offers 6 kΩ of impedance, letting the designer superimpose rapid-change signals without upsetting the primary command loop. For diagnostic purposes, the monitor test point is buffered through 10 kΩ, ensuring that oscilloscopes or panel meters do not disturb the live circuit. Feedback from a spool position sensor can be accepted because the sensing input is high-impedance at 1 MΩ, which minimizes loading on delicate transducers. Despite the array of analog stages, the board weighs only 0.4 kg, so it adds little mass to the enclosure and can be handled easily during maintenance.