A baler has a flywheel, a plunger connected to the flywheel via a crank, an auxiliary motor for rotating the flywheel in a reverse direction and a start-up control system comprising a sensor for providing a signal indicative for the position of the crank and a control unit for controlling the auxiliary motor for rotating the flywheel in reverse direction to a predetermined launch position for enabling the flywheel to gain sufficient kinetic energy before the first plunger impact, at the next start-up.
