Mitsubishi contactor keeps moving.

Dear found the following reasons for you: 1. When the motor is started under heavy load, the voltage drop of the power grid is too large, which is lower than the minimum working voltage of the contactor, or the motor itself has insulation defects. 2. There is dust in the auxiliary contact of contactor, which leads to poor contact of control loop. 3. Rust or dust on the contactor core leads to poor suction and poor contact of auxiliary contacts. As for the sparks, they are all caused by the arc caused by poor contact. 40A contactor motor should be around 15 kW. If there is a clamp ammeter, you can see whether it is the motor itself. Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used for power, distribution and consumption. In a broad sense, contactor refers to an electrical appliance that uses the current flowing through the coil to generate a magnetic field, so that the contacts are closed and the load is controlled. The working principle of contactor is: when the contactor coil is energized, the coil current will generate a magnetic field, and the generated magnetic field will make the static iron core generate electromagnetic attraction to attract the moving iron core, and drive the AC contactor to move. The normally closed contact is opened and the normally open contact is closed, which are linked. When the coil is powered off, the electromagnetic attraction disappears, and the armature trips under the action of the trip spring, so that the contacts are reset, the normally open contacts are disconnected, and the normally closed contacts are closed. The working principle of DC contactor is somewhat similar to that of temperature switch. I hope I can help you. Thank you.

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What is the reason why the contactor keeps jumping?

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What is the reason why the contactor keeps jumping?

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What is the reason why the contactor keeps jumping? Hello, dear, the main reason for frequent tripping of contactors is that there is a gap when the iron core is anastomosed (or there is a foreign body stuck at the iron core anastomosis). I hope I can help you.