Product Description:

The EEA-PAM-581-D-33 is a plug-in power amplifier card from Vickers in the EEA-PAM Power Amplifiers series. The board conditions command and feedback signals so a proportional solenoid valve receives the correct current for precise hydraulic flow or pressure control in automated machinery.

It draws logic and drive power from a 24 VDC supply, and the internal reference generator provides +10 VDC so external controllers can scale command voltages without an additional source. When a current command signal is used, the board presents 100 Ω of input impedance, minimizing burden on PLC analog outputs, while the feed-forward input is higher at 6 kΩ, promoting sensitivity to dynamic changes. The output stage can deliver up to 3.2 A of solenoid current, allowing operation of high-force proportional valves. At zero-volt command the amplifier still supplies 1.7 A, a residual bias that helps overcome mechanical friction. A factory deadband compensation of 10 % is preset to linearize the valve around null.

System integration is through a DIN 41612 F48 male connector, which routes command, feedback, and power lines to the cabinet backplane. A dedicated +15 VDC LVDT supply supports position feedback transducers, and sensor current loops encounter 100 Ω of input impedance, while voltage feedback paths face 1 MΩ, preventing loading errors. The voltage command path is buffered by 47 kΩ, so noise picked up on long cables is attenuated. For ramped set-point changes the generator input also sees 10 kΩ, producing predictable RC time constants when external capacitors are added. The reference source can source up to 5 mA, adequate for multiple parallel loads. A 10 kΩ monitor point permits direct oscilloscope connection without affecting the control loop. These remaining attributes complete the card’s signal conditioning and diagnostic functions.