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Ren Yi Electric Encyclopedia: Reasons and inspection methods for contactors not closing after power-on

Ren Yi Electric Encyclopedia: Reasons and inspection methods for contactors not closing after power-on

  • Time:2020-07-08 12:26
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(Summary description)Regarding the reason why the contactor does not close after being energized, find out the contactor does not work after pressing the closing button, the contactor of 380V power supply, and the solution when the electroscope at both ends of the coil are on, after the AC contactor is energized There is a sound but not completely closed.

Ren Yi Electric Encyclopedia: Reasons and inspection methods for contactors not closing after power-on

(Summary description)Regarding the reason why the contactor does not close after being energized, find out the contactor does not work after pressing the closing button, the contactor of 380V power supply, and the solution when the electroscope at both ends of the coil are on, after the AC contactor is energized There is a sound but not completely closed.

  • Categories:Industry News
  • Author:Ren Yi
  • Origin:http://www.scrydq.com
  • Time of issue:2020-07-08 12:26
  • Views:
Information
Regarding the reason why the contactor does not close after being energized, find out the contactor does not work after pressing the closing button, the contactor of 380V power supply, and the solution when the electroscope at both ends of the coil are on, after the AC contactor is energized There is a sound but not completely closed.
 
The problem that the contactor does not close after being energized
 
1. Find the contactor failure after pressing the closing button. If there is no instrument such as a multimeter on site, you can also use an electroscope to find it.
 
Note that for 380V (two live wires connected to the coil) and 220V (one live wire and one neutral wire are respectively connected to one outlet end of the coil), the relationship between the detected phenomenon and the fault will be different (the formula "three eight, two two are different" ).
 
2. For the contactor of the 380V power supply, if both ends of the coil are lighted by the electroscope, then the power is cut off and a piece of wire is removed before powering on for inspection. If both ends are still lighted at this time, it means that the fault occurred in the external circuit just after In the removed circuit; if both ends are not lit, it means that the fault has occurred in the circuit where the external circuit has not been removed; if it turns on and off, it means that the coil is open.
 
3. When using 220V power supply, the coil fault finding method is the same as that of an incandescent lamp. The mantra "one on and one off and replace it with a new one" means: the coil is broken at this time, and a new one needs to be replaced.
 
4. After the AC contactor is energized, there will be a noise, but it cannot be completely closed.
 
The reason why the contactor does not close after being energized and how to find it (recipe):
 
The coil makes noise when energized, and the voltage must be measured. The voltage is enough to be blocked, and the power failure is excluded when closing.
 
Check the line if the voltage is too low, and it is difficult to prevent the power supply from being connected incorrectly. It rattled after being powered on, and couldn't close without stopping.
 
Common voltages do not match, including high voltage and low difference. The 38-wire package is two-two pressure, and the coil is hot for a long time.
 
Another reason is the virtual connection, which is swaying intermittently.
 
Sichuan Renyi Electric Co., Ltd. is registered under the name of Ren Yi, a senior technician for substation maintenance, and uses scientific research, knowledge innovation, publicity, promotion, and teaching that the temperature of electrical contacts (connectors) is lower than the temperature of its conductors (wires). The theory and technology of "thermal electrical contacts" produces and sells electrical equipment with registered trademarks that do not overheat electrical contacts (joints). Patented products are integrated.
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