A. The electrical safety switch of the speed limiter fails. After the elevator overspeeds, the control circuit is not disconnected, and the brake is not held;
B. The mechanical switch of the speed limiter fails;
C. Although the overspeed governor operates, it cannot control the movement of the car safety gear. The reason is: the speed limiter wheel groove is worn, reducing the friction between the sheave and the speed limiter rope. , But the pulling force of the overspeed governor cannot make the safety gear work;
D. The speed adjustment part of the overspeed governor is loosened. This phenomenon generally does not occur.
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