METHOD AND TEST SYSTEM FOR TESTING FAILURE OF A MACHINERY BRAKE OF AN ELEVATOR

摘要

The purpose of the invention is to detect a failure situation wherein the machinery brake of an elevator does not open sufficiently. In the method for testing failure of a machinery brake of an elevator: the machinery brake is controlled to open; after this, the traction sheave is oscillated with a test torque; the movement of the elevator machine is measured in connection with the oscillation; if the machine does not move in connection with the oscillation, it is deduced that the machinery brake has not opened and has therefore failed. Most preferably a shorter time is selected as the oscillation time than the time according to the displacement function of the elevator mechanics for transmitting movement of the traction sheave into movement of the elevator car, in which case the oscillation is not noticed in the elevator car. This enables testing of a machinery brake when the elevator car is manned.