Product Overview The FR-D740-022-E8 is a compact general-purpose inverter from the FREQROL D700 series, a three-phase 400 V class drive designed to be built into control panels. All routine interaction happens on the front face: the adjustment dial, the keypad, the indicator window and the terminal cover are reachable without dismantling the panel. The unit in this listing carries the manufacturer's printed nameplate on its side and the manufacturer's printed panel and label