Analyze whether the contactor in the distribution cabinet is normal

  Contactor is an important electrical component in electric drive and automatic control system
In fact, it is an electromagnetic electrical component with contacts
The main contact of the contactor passes through the working current, and the auxiliary contact of the contactor controls the opening and closing of the main contact through the control current signal
The electromagnetic contactor is an iron core made of magnetic conducting silicon steel or silicon steel sheet
When the iron core is induced by current, it will act, drive the opening and closing of the main contact of the contactor, and complete the on and off control of the main circuit
Contactor is a remote control device that frequently connects and disconnects the main circuit through the action of electromagnetic mechanism
In the circuit, by using the letter “ KM” Indicates, while “ is usually used on the model; C” express
Contactors are divided into AC contactors and DC contactors according to the types of current passing through the contacts As the contactor is a kind of low-voltage electrical appliance commonly used in low-voltage distribution cabinet, switch cabinet and distribution box, we have a high probability of contacting the contactor
Before our complete set manufacturers install the contactor in the distribution cabinet, it is necessary to detect the quality of the contactor (generally, the factory will detect it before leaving the factory, and the probability of failure is very small)
Or it is delivered to the owner
In case of failure, it is also necessary to detect whether the contactor is damaged
So, how do we judge the quality of the contactor? Next, the method to judge whether the contactor is good or bad is introduced in detail When the internal coil of the contactor is energized, the internal switch contact will be pulled in; When the internal coil is de energized, the internal contacts open
Therefore, when detecting the contactor, it is necessary to detect its internal coil resistance and the resistance of the internal switch in the open and closed states
Since the contactor is powered off to detect whether it is good or bad, the switch contact button at the upper end of Anton contactor is required to force the contact to close for detection
The methods to judge whether the contactor is good or bad are as follows:   1
if the measured internal coil of the contactor has a certain resistance value, the resistance value of the internal switch is 0 in the closed state, and the resistance value is infinite in the disconnected state, then it can be judged that the contactor is normal
2
if the measured resistance of the internal coil of the contactor is infinite or zero, it indicates that the internal coil of the contactor has been damaged
3
if the resistance value of the switch of the contactor is zero when it is disconnected, it indicates that the internal contact of the contactor is adhered and damaged
4
if the measured resistance of the contactor switch is infinite when it is closed, it indicates that the internal contact of the contactor is damaged
5
if any of the four groups of switches inside the contactor is damaged, it means that the contactor is damaged
Manufacturer of distribution cabinet: http://www
jtcele
com/