Product Description:

The EEA-PAM-525-F-30 is a plug-in power amplifier card manufactured by Vickers for the EEA-PAM Power Amplifiers series. Designed for electrohydraulic automation, it conditions analog or current references and drives proportional valve coils so that flow or pressure can be modulated in real time. Its circuitry operates from a single 24 VDC cabinet supply, keeping installation simple while providing internal reference voltages for closed-loop speed and position control. This arrangement lets one compact card support both command processing and valve actuation inside a hydraulic control cabinet.

The card accepts a current command of ±20 mA across a 100 Ω shunt and also processes a voltage command of ±10 V at 47 kΩ input impedance, giving flexibility when paired with PLC analog outputs. An enable window of 17 to 40 V must be present on the logic terminal for the power stage to activate, while a separate disable line is recognized between 0 and 3.5 V to force immediate shutdown. Digital inputs load no more than 10 mA, minimizing the burden on upstream I/O modules. Velocity demand, ramp, and P-controller channels each use ±10 V signals with dedicated impedance levels to shape acceleration and steady-state dynamics. Reference outputs supply ±10 V at 5 mA for potentiometers or external summing nodes. Mass is held to 0.4 kg, allowing the board to mount on light DIN rail carriers without additional supports. Separate control paths also allow the card to fit systems that combine command inputs, ramp generation, and closed-loop correction on one amplifier.

A diagnostic transistor sinks up to 50 mA to announce overcurrent, overtemperature, or external fault conditions to a PLC alarm input. Internal regulators furnish +15 V exclusively for LVDT position transducers, eliminating the need for separate excitation modules. Reliable operation is specified from 0 to 50 °C, and the assembly may be stored or shipped at –25 to +85 °C without performance loss. Ramp and P-controller outputs mirror their respective inputs at ±10 V through paths of 10 kΩ or less, enabling easy signal monitoring during setup. The available fault indication and monitor points support straightforward status observation within the larger control system.