Product Description:

The EEA-PAM-568-A-32 is a plug-in power amplifier card produced by Vickers within the EEA-PAM Power Amplifiers series. Designed for proportional valve control, the unit converts low-level command voltages or currents from a PLC or motion controller into regulated coil current so hydraulic actuators follow commanded positions or forces. Its Eurocard construction allows quick installation into standardized industrial racks while its onboard electronics manage signal conditioning, power conversion, and multiple protective functions required for reliable closed-loop automation.

With a physical height of 3U, the board slides directly into 19-inch subracks and mates through a DIN 41612 F48 Male backplane connector that carries both power and I/O lines. The amplifier draws a nominal supply of 24 VDC and internally generates a regulated control rail of ±15 V that can source up to 50 mA to external transducers. Valve coils are driven by a pulse-width-modulated PWM output, allowing efficient current regulation while limiting thermal rise. Command signals can be supplied as a current at pin z6 or as voltages on the non-inverting inputs b6, b8, b10, and z8, giving flexibility for different controller interfaces.

The differential path is completed by the inverting input at z10, and a current command arriving on z6 encounters an input resistance of 100 Ω, enabling accurate scaling from typical 0–20 mA sources. Voltage commands face an input impedance of 47 kΩ, minimizing loading on upstream analog cards. For reference generation, the board provides ±10 V at up to 5 mA so peripheral electronics can derive stable setpoints. Protective functions are integral: the drive stage recovers from overloads through its Automatic Reset circuit, load lines remain operational under shorts, and the supply network is shielded by a Reverse-Polarity barrier. Together these measures support continuous field operation without external intervention.