The effect of the driven machine on the gear unit is taken into account with sufficient accuracy using the service factor fB. The service factor is determined according to the daily operating time and the starting frequency.
Three load classifications are taken into consideration depending on the inertia acceleration factor. You can read off the service factor applicable to your application in the graphic below. The product of the ascertained service factor and the required output torque must be less than the maximum permitted output torque.