EEA-PAM-533-B-21 by Vickers

The EEA-PAM-533-B-21 power amplifier from Vickers belongs to the EEA-PAM Power Amplifiers series. Installed in a valve electronics rack, this card conditions analog command signals and drives proportional solenoids, letting a PLC or motion controller manage hydraulic spool position through the built-in LVDT feedback circuit. Its role is to translate low-level voltage or current references into the controlled energy required for precise valve actuation within automated presses, test stands, and material handling equipment.

Its electronic section is powered from a nominal supply of 24 V DC and can deliver up to 2.7 A of solenoid current for valve actuation. The module accepts either a ±10 V command voltage or a 20 mA current reference; the current input has 100 ? of impedance, while the voltage input is buffered by 47 k?, minimizing load on upstream controllers. A drive-enable circuit becomes active when the front-edge monitor exceeds 9.8 V, preventing unintended energization during power-up. Feedback is available through command and spool monitor outputs that both scale to 10 V, and a reference output supplies ±10 V at 5 mA for external setpoint generation. All connections are made through a 48-way DIN 41612 Type F edge connector.

The card occupies a 3U slot and weighs only 330 g, which eases installation in densely populated control enclosures. Internally, a ramp generator can stretch or compress command changes up to 5 s, allowing smooth hydraulic acceleration without external circuitry. For position feedback, the board provides an LVDT excitation of +15 V at 50 mA and reads the returning spool signal through its dedicated monitor channel. Reliable operation is maintained at ambient temperatures up to 50 °C, supporting continuous duty in machinery cabinets.