Method for making compensations for register deviations

A method of compensating for register deviations, caused by rotational vibrations, in a sheet-fed rotary printing press with a driving gear train (ARZ), connecting a sheet-feeding apparatus (AN) and printing units and/or coating units (DW), and a main drive motor (M), acting on the driving gear train, to which a drive control system (A) is assigned, with the following steps:

• performing a one-time determination of rotational vibrations (S) in the driving gear train (ARZ) and of assigned register deviations at the printing and coating units only in the resonance regions of the rotational speed (nR) while passing through a printing speed range nU to nO under printing conditions durning a calibration operation,
• ascertaining discrete harmonic portions of the rotational vibrations (S) determined for the resonance ranges of the rotational speed (nR), in which register deviations outside of a permissible tolerance range occur,
• ascertaining parameters for oppositely directed harmonic compensation moments (MK) from the harmonic portions of the rotational vibrations (S) detected,
• storing the parameters of the compensation moments (MK) and their assignments to the resonance ranges of rotational speed (nR) and
• superimposing the stored compensation moments (MK) as a function of the rotational speed on the driving moment (MA) of the main drive motor (M) only in the resonance regions of the rotational speed (nR) during printing operation.