Product Description:

The EEA-PAM-568-E-30 plug-in power amplifier card is built by Vickers for the EEA-PAM Power Amplifiers series. It interfaces between a machine’s PLC and a proportional hydraulic valve, translating low-level command signals into the controlled coil current needed for accurate flow or pressure regulation. By modulating current through the valve coil, it lets the host controller set hydraulic actuation precisely and repeatably across the machine cycle.

The amplifier operates from a nominal control rail of 24 V DC; this supply must remain above the under-voltage threshold of 18 V DC to avoid an automatic shutdown. If line conditions rise, the circuitry endures up to 40 V DC without damage. An enable pin that presents 22 kΩ of input resistance becomes active once at least 9.8 V is asserted, allowing direct connection to standard transistor outputs while safeguarding sensitive logic. These power-domain limits define the safe operating envelope for cabinet designers.

The internal regulators draw 40 W at full load, so cabinet supplies must be sized for that continuous demand. This budget includes gate drive losses and onboard signal conditioning overhead. A monitor jack buffered by 10 kΩ output impedance lets technicians scope valve command signals without disturbing the loop; service engineers can therefore verify calibration without interrupting production. For reference generation, the card provides a stable ±10 V source rated at 5 mA; its drift is limited to 1 mV/°C, simplifying temperature compensation in remote electronics. When load faults occur the drive channel trips, then clears itself through an Automatic Reset routine that restores output once the overload is removed; this avoids manual intervention and preserves production uptime.