EEA-PAM-535-E-30 by Vickers

The EEA-PAM-535-E-30 power amplifier is manufactured by Vickers as part of the EEA-PAM Power Amplifiers series. Designed for electro-hydraulic automation, the board drives the KFDG4V-5 proportional valve. It turns voltage references from a controller into regulated coil current that moves a spool in precise correspondence with command signals.

This card is energized by a nominal supply of 24 VDC and it tolerates a wider input window of 20-40 VDC, allowing operation in systems with fluctuating bus levels. Internal electronics dissipate up to 40 W during full load, so cabinet ventilation must handle that heat. For open-loop tasks, the command channel accepts a span of 0-100%, and feedback observation is available through a monitor test point that provides a buffered signal with an impedance of 10 k?. A shutdown routine is triggered when bus voltage drops below 18 VDC to protect the valve coils. The card also includes a sensor interface: it sources up to 20 mA, accepts transducer returns scaled at 0-2 V for 0-20 mA, and permits external excitation up to 24 V. These inputs let the amplifier close velocity or pressure loops without additional signal conditioning.

Dynamic response is configured with a closed-loop velocity range of 5-100%, a deadband trim of 0-50% of maximum current, and a ramp generator adjustable from 50 ms-5 s for controlled acceleration or deceleration. Continuous service is specified from 0 to 50 °C, while storage limits extend from -25 to +85 °C, so the unit can be kept in unheated stockrooms yet still function in normal plant temperatures. During operation, the board can deliver sensor currents up to 20 mA, maintain open-loop or closed-loop modes as selected by the user, and sustain reliable output until a commanded shutdown or loss of supply occurs.