How to check the contactor
As previously mentioned in the topic of explaining the contactor and how it works, it is a device used in automatic control circuits to control electric motors so that it works on turning on and off electric motors through its connection points and is available in several different types and sizes depending on the type of use and As well as the type of circuit to be operated and controlled.
The function of the contactor is manifested in connecting and disconnecting the electric current almost like a regular cutter, but the contactor has special specifications, because it is controlled by connecting it to the electric current and not manually like normal switches, and it bears very high currents and also has several different connection points Depending on the type of contactor, as well as the type of circuit we want to control,
How to check the contactor
The contactor is checked through the avometer by placing it on the bell position, where the three main terminals of the power supply to the motor are tested, which are in the normal position in the case of disconnection and do not ring until the contactor picks up. The contactor can be operated manually to hear the ringing sound and make sure of the The safety of its strengths connection points.
The file or the rumor is also tested by placing the Avometer on the ohm mode and measuring the two ends of the file. If it reads a certain value, the tube will be intact. But if it does not read anything, meaning that the OL symbol appears on the ovometer, this means that the file is damaged and cut or that it has a burn due to the passage of a high current From which .
The auxiliary connection points are tested so that the NC switches give a sound on the ovometer, while the NO switches do not give a resonance, and that is in their normal position without the presence of current.
And we have already mentioned how to use the avometer and how to use it in the examination. You can refer to it from here.
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