Being the power-supply unit for the rescue operational

摘要

It possesses with the comparator because the electric power unit for the elevator drive compares voltage input and input potential with specified threshold and the transformer which possesses the primary coil and the secondary winding which is connected to the elevator drive, the transformer has the single tap turning on primary coil, when input potential exceeds specified input threshold, comparator output in the primary coil, through one end of the coil or the tap of the coil, makes electric power supply, when input potential is less than specified threshold, input power in the primary coil, through the other end of the coil and the tap of the coil, is supplied.