Product Description:

The EEA-PAM-523-D-30 plug-in power amplifier is produced by Vickers for the EEA-PAM Power Amplifiers series. Mounted in a 19-inch rack, the board converts low-level command voltages from PLCs or motion controllers into regulated current that drives proportional hydraulic valve coils, allowing an automation system to modulate fluid flow or pressure with electronic precision. The module also offers built-in ramp generators and accessible test points, allowing valve behavior to be monitored during routine service without removing the unit from the rack.

At the output stage, valve tuning begins with a target inductive load of 20 mH, while the winding resistance of 7.3 Ω determines the initial voltage drop seen by the amplifier. The circuit supplies a maximum continuous coil current of 1.6 A, matching mid-range Vickers proportional valves used on presses, extruders, and mobile platforms. Heat buildup is controlled because the relative duty factor is rated at ED 100%, allowing uninterrupted energization during normal operation. The front panel and connectors have a protection rating of IP65, so they resist dust and water spray when the card is installed in an exposed machine enclosure. Command changes propagate quickly, with a 0 to 100% step reaching a steady state in 25 ms. This short response time minimizes lag when the amplifier regulates valve movement in a closed-loop hydraulic axis.

Bidirectional movements follow similar response profiles. A swing from +90% to -90% of the command settles in 35 ms, while a full-scale release from 100% to zero current is completed in 30 ms. These response values can be used when calculating allowable valve slew rates and hydraulic cushioning for rapidly changing loads. The coil voltage code H indicates that the board is calibrated for the 24 V supply rails commonly used with Vickers proportional solenoid families, allowing direct electrical compatibility without an external voltage converter.