What is the cause of the magnetic door lock closed loudly?

Is using the principle of electric raw magnetic magnetic door lock, when an electric current passes through the silicon steel sheet, tightly absorb electromagnetic lock will produce a powerful suction adsorption iron plate to achieve the effect of locking the door when you leave. So you know what is the cause of the magnetic door lock closed voice big? 1. Check whether there is a rubber gasket. 3. Check whether the magnetic locks lock body and suction plate spacing is appropriate. 2. Check iron plate, screw is too loose. Magnetic door lock is closed when the voice of reason mainly is to share these above, such problems are not much of a problem, you know.