Product Description:

The EEA-PAM-561-A-31 is a plug-in power amplifier card produced by Vickers and supplied within the EEA-PAM Power Amplifiers series. Designed for electro-hydraulic automation, the module accepts command references from PLCs or analog controllers and modulates the coil current of proportional valve solenoids. By translating low-level voltage or current signals into a controlled high-current output, the unit supports precise flow or pressure regulation in presses, injection molding stations, and motion axes. It mounts in a standard 32-pin Eurocard rack for straightforward installation.

Primary power is supplied by a 24 VDC × 50 W source, which provides the energy required for solenoid actuation while keeping cabinet wiring at a safe extra-low voltage level. Internal logic stages are stabilized by a split auxiliary supply of ±15 VDC × 50 mA, isolating reference generation from load fluctuations. The card accepts command signals in two formats. For current-mode control, it reads ±20 mA loops and uses 100 Ω of input resistance to maintain the standard 1–5 V burden seen by upstream transmitters. For voltage-mode control, it accepts a span of ±10 V, allowing direct coupling to most motion controllers without additional scaling or buffering.

Factory adjustments establish a 10 % deadband, ensuring the valve remains closed until a meaningful command is present and helping avoid drift around the null position. Overall loop sensitivity is preset to 10 %/V, so each volt of reference changes the output phase current by one tenth of full scale. The power stage can deliver up to 2.9 A of solenoid current, supporting medium-sized proportional valves without an external booster. For downstream devices that need a feedback reference, the board supplies ±10 VDC × 5 mA, allowing a monitor signal or remote summing input to be connected without overloading the amplifier.