How to judge whether the contactor in the distribution cabinet is normal

Publish Time:2017-06-15 Author:admin Views:0

A contactor is a long-distance manipulator that is frequently connected and disconnected from the main circuit through the action of the electromagnetic mechanism. In the circuit by means of the letter "km", and in the model is usually "C" representation. The contactor is divided into two types: AC CONTACTOR and DC contactor according to the different types of contacts through the current.

Because the contactor belongs to the Low-voltage Power distribution cabinet, distribution box more commonly used in a low-voltage electrical appliances, so we contact the probability of a higher, in our complete set of manufacturers in the contactor installed in the distribution cabinet, it is necessary to detect the quality of the contactor (general factory will be detected before the factory, the probability of bad is very small). Or is delivered to the owner, if the failure occurs, also need to detect the contactor damage. So how do we judge the quality of the contactor?

When the inner coil of the contactor is energized, the internal switch contacts are absorbed and the internal contact is disconnected when the internal coil is powered down. Therefore, when testing the contactor, it is necessary to detect the resistance of the internal coil resistance and the internal switch in opening and closing state. Because it is a power failure to detect the contactor's good or bad, therefore, the need of the upper end of the Anton Contactor switch touch button, forcing the contact closure to detect.

The method of judging the contactor is as follows:

1. If the internal coil of the contactor has a certain resistance, the internal switch in the closed state, its resistance is 0, in the disconnected state, the resistance is infinite, it can be judged that the contactor is normal.

2. If the internal coil resistance of the contactor is infinitely large or 0, it indicates that the internal coil of the contactor is bad.

3. If the switch of the contactor is in a disconnected state, the resistance is zero, indicating that the contact adhesion inside the contactor is damaged.

4. If the switch of the contactor is in a closed state, its resistance is infinite, indicating that the contact inside the contactor is damaged.

5. If the four sets of switches inside the contactor are detected, any group of damage, all of which indicates that the contactor is damaged.

Because of the important role of contactor in Low-voltage distribution cabinet, in order to ensure its normal operation, we can judge whether the contactor is normal according to the above conclusions.