Where is the emergency power supply of Otis machine room?

In the elevator shaft. According to relevant information, Otis elevator controller without machine room can effectively save space. The control cabinet without machine room is divided into four parts. The main control cabinet, emergency power box and braking resistor are placed in the hoistway, and the maintenance box is placed at the door side. For example, the China utility model patent with the patent number of 2007203029 17.2 discloses this elevator controller without machine room, which consists of four parts: main control cabinet, maintenance cabinet, braking resistor box and emergency power box. The main control cabinet, brake resistance box and emergency power box are installed in the elevator shaft, and the maintenance cabinet is installed outside the hall door of a certain floor of the elevator; The signal control part and the frequency conversion driving part of the elevator are installed in the main control cabinet, and the braking resistor wire in the braking resistor box is connected with the driving device in the main control cabinet; The debugging operation keyboard, monitoring window, maintenance operation button and emergency power button of the elevator are installed in the maintenance cabinet.