In residential elevators, the elevator control cabinet is separate. When the elevator loses power, this device takes over the elevator's control, bringing the car to the nearest level and opening the doors to allow passengers to evacuate safely. This type of power outage emergency rescue equipment is typically a complete product. The entire set of equipment is assembled in a single cabinet, offering good versatility and compatibility with most elevator control cabinets. For elevator manufacturers, this means simply procuring and assembling a complete set of equipment near the control cabinet, ensuring proper interface wiring. Elevator manufacturers' technicians don't need to spend too much time understanding the internal structure of the equipment, and most manufacturers of power outage emergency equipment provide assembly and commissioning services.
Therefore, these products are very popular among small and medium-sized elevator manufacturers and engineering companies, and are among the earliest and most widely used products in my country. Currently, several domestic companies specialize in producing such power outage emergency rescue devices. This device consists of a control circuit and a battery. The control circuit generally comprises a detection control circuit, a charging circuit, and an inverter circuit. The detection control circuit is responsible for detecting the elevator's power supply status, activating the emergency rescue device in the event of a power outage, and then detecting relevant elevator signals. When the elevator safety circuit is detected to be connected (if there is a phase sequence relay, it should be short-circuited), and the elevator maintenance/normal switch is in normal condition, the device begins to work and further detects the car position. When the car is at the landing level, the emergency rescue device provides power and a signal to open the door, allowing passengers to evacuate. When the car is not at the landing level, the inverter circuit is activated, reversing the DC power of the battery to generate low-voltage, low-frequency AC traction motor operating current. The elevator crawls slowly to the nearest horizontal position and then opens the door for passenger evacuation. A few seconds after the elevator door opens, the rescue is complete, and the rescue device disengages.
