Product Description:

The EEA-PAM-571-A-32 power amplifier card is manufactured by Vickers for the EEA-PAM Power Amplifiers series. Intended to drive proportional solenoid valves in hydraulic motion control, the module converts voltage or current commands from PLC, joystick, or analog controller sources into regulated coil current so that valve spool displacement tracks the reference signal. By mounting the board close to the manifold it shortens cable runs and improves response in presses, injection machines, and mobile work platforms.

The card’s signal interface is designed for both current and voltage references. A command span of ±20 mA passes through a 100 Ω current input, while a voltage command of ±10 V is accepted on a 47 kΩ input path. Those impedances isolate the source and minimize loading. Internally, the electronics are powered from a ±15 VDC, 50 mA auxiliary supply, and a stable ±10 VDC, 5 mA reference is available for external potentiometers. Supply ripple is limited to 50 mV peak-to-peak to reduce dither. With a zero-volt reference the board draws 1.7 A, and it can deliver up to 3.2 A of coil current so larger proportional valves achieve rated force quickly.

Main power is supplied at a nominal 24 VDC, with an operating band from 20 to 40 VDC; the amplifier shuts down below 18 VDC to protect the hydraulic sequence. The drive stage dissipates up to 50 W and should be mounted on a metal back-plate for heat spreading. Output transistors are Short-Circuit Protected, preventing wiring faults from damaging the module, and the input terminals include Reverse Polarity protection so misconnections do not reach sensitive logic. Together with the low control supply ripple these safeguards keep valve force stable during temperature changes and load transients.