Product Description:

The EEA-PAM-561-E-31 plug-in power amplifier is supplied by Vickers within the EEA-PAM Power Amplifiers series. In an automation cell it converts low-level control references into valve drive power so that electro-hydraulic actuators follow electronic commands. The card presents front-edge test points, LED annunciation, and screw terminals for straightforward cabinet integration.

For internal electronics the board draws a control supply of +15 V, a regulated rail that powers its signal-conditioning network and reference generators. The opto-isolated digital input expects a nominal level of 24 V DC; at that threshold the amplifier interprets an on-command from the host controller. Because the input circuit holds a resistance of 2.7 kΩ, it limits current to prevent stress on PLC output transistors. A drive-enable gate releases output only when at least 9.8 V is present, providing a margin that suppresses chatter during brownouts. With all hardware populated the board weighs just 0.4 kg, permitting dense stacking in multi-axis valve enclosures without exceeding panel load limits.

The diagnostic jack linked to the summing node is buffered by 10 kΩ of impedance so oscilloscopes can sample feedback without altering circuit gain. Current-mode transducers connect through a shunt of 100 Ω, establishing a measurement loop that reaches 20 mA while maintaining a defined voltage drop. For voltage-mode feedback the input path offers 100 kΩ impedance, allowing high-impedance probes to couple with minimal loading, and it tolerates sensor outputs up to 24 V before clamping. These interface characteristics let system designers mix pressure transmitters, position LVDTs, or potentiometric levers on the same card without recalibrating adjacent channels.