New solution Selected faults are acknowledged automatically. This makes particular sense if the fault is present only for a short time and normal operation can then be resumed afterwards. (e.g. bus fault, malfunction at lifting unit converter, longitudinal travel). The faults selected in the DB35 are automatically acknowledged after 30 seconds. The period during which the fault is present is sufficient in order to log the fault. This occurs 3 times (adjustable) within a period of 48 hours (2880 min, adjustable). After these three attempts, the system waits for 48 hours before another acknowledgement is performed. Each time the fault occurs, the period of 48 hours starts again. In the case of the lifting and longitudinal travel converter, each attempt is counted twice.