The SI 50.80-55.00 NHK FU DES is a self-locking, powerful industrial drive with frequency controller and emergency hand crank (emergency chain hoist is available on request) that has been specially developed for driving a high-speed door. This drive is mounted directly on the shaft of the door, has an integrated roll-off protection and is supplied as standard with a swing foot. With the frequency controller, soft start, soft stop and the speeds for opening and closing can be adjusted independently of each other via a TS series control.