Method is for detection of fault in ventilation system and uses motor control (3) which internally contains large amount of control information and data covering load (3) for speed regulation of load

摘要

The method is for the detection of a fault in a ventilation system and uses motor control (2) which internally contains a large amount of control information and data covering the load (3) for speed regulation of the load, but this data can also be used for identifying a fault in the load system. The motor control generates a predetermined axle torque profile (18) and compares it with a calculated actual axle torque. - If the calculated actual axle torque is outside a detection band, which is applied around the preferred predetermined axle torque, a fault situation is signalled. Such a fault can be the blocking of a filter in front of fans.