Operator for sliding doors with three-wheeled carriages, which ensures that the doors are very stable and easy to adjust, both in height and depth. The operator has a control unit with LED alphanumeric display, full-range switching power supply (100-240V 50/60Hz) and battery charger. The presence of a USB connector makes it simple and quick to update the firmware as well as to copy parameters and operating logics to a new system instantly. Continuous operation guaranteed.