Product Description:

The EEA-PAM-520-A-14 power amplifier is manufactured by Vickers as part of the EEA-PAM Power Amplifiers series. Supplied in a plug-in card format, it interfaces between electronic motion controllers and proportional hydraulic valves, converting low-level command voltages into regulated coil current. In industrial automation systems, the card stabilizes valve spool position, allowing repeatable flow or pressure regulation without the need for separate discrete drive components. By regulating coil current directly, it also helps keep valve response stable during repeated motion cycles and changing hydraulic loads.

The amplifier uses a Eurocard outline, allowing it to slide directly into 19-inch sub-racks that already carry system backplanes. Its current output is limited to 1.6 A, matching the magnetics of the supported proportional solenoids and helping prevent coil overheating. Internally, the driver references the valve winding with a 29 mH inductance so the control loop can account for the natural electrical time constant of the load. A series sense network monitors the winding’s 7.3 Ω resistance to compensate for temperature-related changes in coil impedance. For motion profiles that need controlled acceleration or deceleration, the board provides a One Ramp function with a single adjustable rise and fall time to shape the current transition and reduce hydraulic shock.

In operation, the amplifier can deliver up to 18 W to the connected solenoid without exceeding its thermal envelope, maintaining steady actuation during continuous cycles. It is pre-tuned for proportional valves such as KDG4V-3S, KTG4V-3S, KDG5V-5/7/8, so field wiring mainly involves jumper selection rather than gain recalibration. The board can also be used with machinery built to EN427 models. The build code carries the coil identifier H, indicating compatibility between the valve’s magnetic components and the amplifier output characteristics.