Method and apparatus for controlling the braking of a printing machine

摘要

A description of a method and a device for monitoring the braking of a D.C. motor of a printing machine such as a sheet-fed offset printing machine is given. For safety purposes, in the case of an emergency stop an electrical braking should always be carried out with the maximum torque of the D.C. motor. For this purpose, the disclosed method provides that the actual value of the armature current is detected and compared to a maximum permissible value for the electrical braking. In the event of an impermissibly high deviation and, in particular, in the event of an undershoot of the armature current relative to the maximum permissible value, the power converter and motor are disconnected from the power supply and an electrically actuable brake is applied to the motor.