The ACS550 mobile phone-like control panel features two soft keys, a help button and a real-time clock to assist in fault diagnostics. Start-up assistant software provides guided, step-by-step start-up in any of 16 languages. The real-time clock logs time of faults, easing diagnostics of drive performance. A “swinging choke” design in the ACS550 reduce harmonics by up to 25 percent compared to conventional choke designs, the vendor says. A digital interface card and field bus adapters are available as options. The ACS550 is offered in a 1 to 550 horsepower range, and in NEMA 1 or NEMA 12 enclosures, with supply voltages from 208V to 480V.