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A Reason: excessive current, poor contact, contact oxidation, etc.
Treatment method: Check the contact condition of the contacts, adjust the contact pressure, ensure good contact, and check whether the load current exceeds the rated current of the contactor.
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A Reason: frequent switching, excessive load, aging of contact material, etc.
Treatment method: Clean the contacts or replace the contacts, check whether the load is too large, and ensure that the contactor operates under rated load conditions.
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A Reason: poor contact, excessive current, contact erosion, abnormal mechanical movement, etc.
Treatment method: Check the contact condition of the contacts, adjust the contact pressure or replace the contacts, check whether the load is too large, and replace the contactor of appropriate specifications.
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A Reasons: loss of coil voltage, release mechanism failure, mechanical jamming, etc.
Treatment method: Check whether the coil is open circuit, check whether the release mechanism is damaged or blocked, and manually operate the release device to check whether it can be released normally.
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A Reasons: insufficient coil voltage, coil damage, poor contact of auxiliary contacts, mechanical jamming, etc.
Treatment method: Check whether the power supply voltage meets the required standards, use a multimeter to measure the coil resistance, check whether the wiring is loose or broken, clean the dirt on the iron core or eliminate the jamming factors.
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A AC contactors are mainly composed of coils, iron cores, reset springs, contact systems, armatures and other components. Among them, coils are usually marked with A1 and A2. The main contacts L1-L2-L3 of the AC contactor are connected to the three-phase power supply input line, and T1-T2-T3 are connected to the power supply output line, which can be used to connect the load line. Auxiliary contacts can be divided into normally open points NO and normally closed points NC.
