Product Description:

The EEA-PAM-513-A-30 is a plug-in power amplifier card produced by Vickers and supplied within the EEA-PAM Power Amplifiers series. Installed in a control rack, the card conditions command signals and drives a proportional hydraulic valve, giving automation systems electronic control over pressure or flow. By converting low-level references from a PLC or motion controller into valve coil current, it provides the interface required for closed-loop electro-hydraulic positioning and force regulation. This arrangement lets the module link standard control electronics to a hydraulic actuator without requiring a separate external amplifier stage.

To operate, the board requires a regulated 24 VDC control input supply that energizes its analog and logic sections. When a process controller transmits a current command, the card presents 100 Ω of input impedance, which supports accurate conversion without placing a heavy load on the upstream source. A separate voltage command path has an input impedance of 47 kΩ, allowing high-impedance reference devices to be connected without extra buffering. For downstream devices that need a stable reference, the card furnishes ±10 V x 5 mA as a bipolar output for potentiometric or sensor bridge circuits. If the incoming supply drops toward 18 VDC, an undervoltage shutdown circuit disables the output stages so the connected valve does not drift unpredictably.

Enabling the drive channel is done through a logic pin that measures 22 kΩ to ground, so the input can be driven by simple relay contacts or low-power transistor outputs. The internal regulator provides 15 VDC for external command potentiometers, which helps keep field wiring simple. All scaling and dither parameters are tuned for the Vickers KCG-3 proportional valve so the coil current ramp matches the intended response of that valve family. Integrated reverse polarity protection on the supply input helps prevent damage if the 24 V feed is accidentally connected backward.