Product Description:

The EHH-AMP-702-D-20 electronic amplifier module is manufactured by Vickers and belongs to the Vickers Accessories series. It conditions analog control inputs and delivers regulated current to proportional hydraulic components used in automated machinery. With a mass of 0.07 kg, the unit fits in tight control panels, and its silicone-potted electronics support continuous service between -20 °C and 70 °C, matching the thermal envelope found on many plant floors. By linking low-voltage command sources to higher-current loads, the module simplifies signal-matching tasks common in industrial automation loops. The low mass also eases placement on compact brackets or inside crowded enclosures.

The module runs from a nominal supply of 24 V DC, yet its circuitry tolerates excursions up to 40 V without damage. A 0–10 V command channel drives the internal pulse-width stage, and when the reference reaches its ceiling the amplifier can furnish a peak of 1.6 A to the load. Continuous delivery at that level requires no more than 35 W from the power rail, which helps limit heat inside the cabinet. The switching stage operates at a carrier of 1200 Hz, so output ripple remains outside most mechanical resonance bands, while the typical series drop is only 1.5 V and leaves more voltage available at the solenoid. That behavior helps the load track a command signal with predictable current response.

For fine positioning, the amplifier ignores input drift until the signal exceeds a threshold of 200 mV, reducing unintended motion caused by noise. A built-in dither generator injects a 120 Hz waveform that can be trimmed up to 500 mA, which helps reduce static friction in valve spools during low-speed movement. The enclosure carries an IP67 rating, allowing use near washdown zones or oil spray without additional sealing. The dither action helps the connected hydraulic component respond more smoothly to small command changes. The sealed housing also supports use in wet or dirty areas where exposed electronics would be more vulnerable.