Product Description:

The EEA-PAM-523-A-32 is a plug-in power amplifier card produced by Vickers as part of the EEA-PAM Power Amplifiers series. The board accepts low-level command signals and modulates current to proportional solenoid valves, providing precise flow or pressure control in automated hydraulic machinery. Installed in a valve drive rack, it receives either current or voltage references from a PLC and supplies controlled current to a valve coil.

Its power section is energized from a 24 VDC nominal supply and, at zero command, draws an input current of 0.3 A to maintain bias. The card’s current input channel presents 100 Ω impedance, while the direct voltage input measures 47 kΩ, allowing it to interface with differential or single-ended sources without loading them. Internal gain is factory-set at 10 %/V, so a 1 V step in command produces a ten-percent change in valve stroke once the built-in deadband, preset to 25 %, is exceeded. Maximum regulated solenoid drive is 1.6 A, and the output can be observed on the front test point that scales current at 1 V/A through a monitor impedance of 10 kΩ. ±15 V auxiliary supply rails, rated 50 mA, are also available for external signal conditioning.

For field reliability, the amplifier incorporates Reverse-Polarity supply protection and an overload circuit that trips under excess current but returns to service through Automatic Reset, eliminating manual intervention during transients. Overall consumption at rated load is 50 W, a figure that helps cabinet designers plan dissipation. Output stability is aided by a temperature drift of only ±1 mV/°C, keeping command accuracy steady over wide ambient ranges. The plug-in board weighs 330 g and provides separate ±10 V, 5 mA reference voltages for low-noise feedback loops.