... frequency inverter = AC drives = varialble frequency drive(VFD) = speed controller = variable speed drive (VSD)KOC-P5 series made by KCLY ... 5.5kw-400kw380Vac +/-15%, 660Vac, 1140VacMain features:1. Double lines of LED display, monitoring 2 kinds of information meantime ... voltage, speed, time, and PID data. 2. Independent cooling channel design. This is good for applications like printing, textile, ...