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‌The Escalator adder path system is the core part of the escalator, which consists of pedals/steps, comb plates, guide rails and chains.

The drive system of the escalator is one of its most basic and core components. Its main function is to provide power so that the escalator can operate. The drive system is the "heart" of the escalator. Without the drive system, the escalator cannot operate normally.

The Elevator Safety protection system is an important device to ensure the safe operation of the elevator and prevent accidents. It consists of multiple components, including speed limiter, safety clamp, buffer, terminal protection device, overspeed protection, power supply fault protection, floor door and car door interlocking devices.

‌The electric traction system of an elevator refers to a system that is powered by an electric motor and controls the operation of the elevator through the joint action of components such as the power supply system and the speed feedback device. The electric traction system is the core of the electrical part of the elevator, responsible for providing the power required for the operation of the elevator and realizing speed control. ‌

The Elevator Car system is the core part of the elevator, mainly used to carry and transport people and materials. It consists of multiple key components, including the car bottom, car wall, car top, car door, etc., which together constitute the elevator's carrying space.

The elevator control system is a core technology system used to manage and coordinate the operation of elevators. It mainly realizes the functions of elevator start, speed regulation, parking, safety protection and authority management. It is composed of hardware equipment and software logic to ensure that the elevator responds to passenger needs efficiently and safely.

The main function of the Elevator guide system is to ensure that the elevator car and counterweight run smoothly along the fixed slideway - the guide rail in the hoistway.

 E22 is a "leveling signal abnormality or wire rope slippage" fault, and it is necessary to specifically troubleshoot mechanical and signal system problems.

Observe whether the elevator control panel or information display screen displays an error code (such as E01, E02, etc.). Some elevators will directly prompt the fault type1.

The ARD in the elevator is an automatic rescue device, also known as an elevator emergency rescue device or an elevator emergency power supply. Its main function is to automatically start and provide emergency power to the elevator control system when the elevator fails (such as power outages, line failures, etc.), so that the elevator can slowly run to the leveling position and open the door to release passengers.