Safe electric braking device for printing presses and method of electrically braking an electric drive in a machine processing printing material

A method of electrically braking an electric drive in a machine processing printing material, the method comprising the following steps:

• connecting the electric drive through a power electronics to a DC voltage intermediate circuit, the power electronics having a main braking resistor;
• connecting a switchable further electric braking device between the electric drive and the power electronics, the further electric braking device having a brake rectifier and an electric brake resistor;
• initiating, through the power electronics, a generator-type braking operation, controlled by a computer, for braking the electric drive with the main braking resistor upon requiring an immediate braking of the machine for safety reasons;
• and
• switching on the further electric braking device upon a failure of the power electronics for braking the electric drive with the electric brake resistor.