Screening machine with acceleration-constant control

A screening machine having a three-dimensional spreading screening movement, said screening machine comprising:

• a screen support for at least one screen base, said screen support being displaceably disposed relative to a housing and being acted upon by a frequency-excited electromagnet, and further being supported via springs relative to said housing;
• a device for determining a vibration level of said screen support;
• and
• a control unit for converting a given vibration level into the required energy supply for said electromagnet, wherein said control unit is designed for calculating an acceleration of said machine as a function of the respective determined vibration level and of the simultaneously determined frequency value as a control value for said energy supply to said electromagnet, for a setpoint/actual value comparison of the calculated machine acceleration actual value with a given machine acceleration setpoint value, and for compensating a determined machine acceleration deviation by adjusting said energy supply to said electromagnet on the basis of the change in the vibration level calculated as a function of the given frequency.