Method for operating a machine for producing and/or processing a material web

A method for operating a machine for producing and/or processing a material web, wherein a first drive unit is supplied by a converter with a current, a vibration propagating over the material web iscaptured via the first drive unit, the vibration is measured and transformed into a measurement signal that is examined for presence of a signature that differs from the basic waveform of the current,a web tear is thus identified if the signature propagating over the material web is missing during the evaluation of the electrical measurement signal, whereby no further sensors, in particular optical sensors, are required to capture the measurement signal, and the measurement also occurs independently of a torque, a speed or speed development of drive motors over time and, moreover, the detection of the web tear does not require a comparison measurement at the machine without a continuous material web. 本发明涉及种用于运行用于制造和/或加工材料幅的机器的方法，机器包括有驱动发动机和变流器的至少个驱动单元，用于使材料幅持续前进的第驱动单元由配属的变流器供应有基础走势的电流，在材料幅前进时借助第驱动单元检测经材料幅传播的振动，其振动