EHH-AMP-702-D-20 by Vickers

The EHH-AMP-702-D-20 belongs to the Vickers Accessories series produced by Vickers. It is an electronic accessory intended for industrial automation panels where it conditions low-level command voltages and delivers controlled current to proportional devices such as hydraulic solenoids. By accepting analog references and translating them into a pulse-width-modulated drive, the module simplifies the interface between PLC analog outputs and field actuators.

This amplifier operates from a nominal supply of 24 V DC, ensuring compatibility with common control power buses. When energized, it can source up to 1.6 A of load current, a level suited for medium-sized valve coils. The input stage accepts command signals up to 10 V; anything below the 200 mV deadband is ignored, preventing inadvertent movement caused by noise. Internally, the output is switched at a 1200 Hz PWM rate, which balances coil heating against response smoothness, while total consumption tops out at 35 W so cabinet power budgeting is straightforward. A typical 1.5 V voltage drop is present between supply and load terminals, and users may raise dither current to the 500 mA upper limit to reduce static friction in mechanical elements.

An absolute ceiling of 40 V protects the circuitry from supply transients, and reliable service is maintained between -20 °C and 70 °C ambient. The housing carries a rugged IP67 rating, allowing installation on machinery that is exposed to washdown fluids or airborne contaminants without an additional enclosure. Output stability is aided by the internal dither generator that runs at 120 Hz, smoothing hysteresis in directional control valves. Despite these capabilities, the module weighs only 0.07 kg, so it imposes negligible load on DIN rail supports and is easy to reposition during panel revisions.