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Question:

Why does a crane have to have "lack of protection"?

A bridge crane, with an overweight limit switch, can be understood, but on safety, why must it be protected by mistake? What's going to happen if there's a lack of error?

Answer:

The so-called missing phase is a normal three-phase power supply that breaks the path. The original three-phase device reduces output power and makes it unable to work properly. Or causes an accident. When the power supply of the line is missing, the current component of the negative sequence will be generated, and the three-phase current is unbalanced or too large, causing the electric motor to quickly burn down. In order to ensure the safe operation of the motor, which in the case of lack of phase operation timely stop the motor running, to avoid fire accidents caused by motor, general motors is associated with lack of protection device.
If there is a sudden lack of phase in the lifting process, the weight will pull the motor down and the weight will fall quickly
For example, in the wrong term, the electric gourd will be reversed, the upper limit. On the lower limit, the person who doesn't know has pushed the button up to think that the limit can be limited, but the limit can be capped

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