Safety device and method for an automatically operating installation having at least one moveable part

A method for safety-related stopping of a moving part of an automatically operating machine, the method comprising:

• fail-safely determining a movement variable of the moving part,
• fail-safely comparing the determined movement variable with a predefined reference value,
• fail-safely stopping the moving part as a function of the determined movement variable and the defined reference value,
• wherein, in order to determine the movement variable, an acceleration of the moving part is first detected by an acceleration sensor,
• wherein at least one of a movement velocity and a movement travel of the moving part is determined as the movement variable on the basis of the detected acceleration, and
• automatically preventing the part of the machine from moving if at least the acceleration sensor senses an unsafe condition.

A method for safety-related stopping of a moving part of a press machine, the method comprising:

• (a) sensing acceleration of the moving part of the press machine with a sensor mounted thereto;
• (b) receiving an output signal from the sensor;
• (c) receiving an output signal from an optical receiver, the optical receiving including at least one of a light barrier receiver and a camera receiver;
• and
• (d) automatically determining if an unsafe press machine condition exists to an operator of the press machine based on the output signals from the sensor and the optical receiver.