Do you know how to check the contactor for damage? Cheapest AC contactor Xiaobian will take you to a brief understanding of it!
The general idea of ​​the contactor principle is that the coil is energized, then the contactor is pulled in, the coil is de-energized, and the contactor is reset. If the contactor does not pull in, it is necessary to check from these directions to check whether the control circuit of the contactor has an open-circuit contact contact and the upper base is completely stuck or other reasons cause the stuck coil voltage to be too low. If there is no problem with the above checks, The basic judgment is that the contactor coil is burned out.
Cheapest AC contactor Xiaobian introduction: If the contactor coil is damaged, if it is a simple control loop, the circuit breaker will trip. To determine whether the contactor coil is normal, another case is that the contactor is not fully closed. In this case, the voltage in the control loop may be too low, or the movable part of the contactor is stuck. The voltage problem can be measured with a multimeter, and manually push down the contactor to test whether the contactor is stuck.
In addition, there are foreign objects in the iron core or oxide layers and burrs caused by contact arcing. In this case, the contactor needs to be disassembled to check. The three cases are that the power-off contactor is not released or not released in time. There are three reasons, the remanence is too large, the movable part is stuck, and the contacts have been welded. Among them, most of the cases are contact fusion welding.
The above is the editor of Cheapest AC contactor: a little knowledge on how to check whether the contactor is damaged.