... energy saver easy understood operation steady quality commodity: frequency inverter = AC drives = varialble frequency drive(VFD) = speed controller = variable speed ... of LED display, monitoring 2 kinds of information meantime, like frequency, current, voltage, speed, time, and PID data. 2 ... . 5. JOG key control, support user self-defined frequency jumping.6. SCR technology, long lifespan of the drives ...