When you need simplicity and intelligence in one self-contained solution the ACS 550 covers a wide range of options. Ideal for variable and constant torque applications from pumps and fans to conveyors and mixers as well as many other variable and constant torque applications. Enjoy plug and play convenience right from the start. No customizing or special product engineering required. Monitor your savings easily with the built-in counters, which display energy savings in kilowatt hours, carbon dioxide emissions or local currencies.