As a common electrical element, the relay plays an important role in the switch control in the circuit. However, relays can also fail due to long-term use, environmental changes and manufacturing quality problems. This paper will introduce the performance and repair method of the relay failure in detail.
1. Performance of the relay failure
1. Relay without current output: this is one of the most common manifestations of relay failure.When the relay does not work, the relay output will have no current output. This may be caused by coil damage, poor contact contact or contact welding, etc. At this time, we can fix the relay fault by using the following methods:
-Check the coil: Use a multimeter for measurement at both ends of the relay coil to check for any open circuit or poor contact. If the coil is damaged, the relay should be replaced.
-Clean the contact: If the contact contact is bad or welding phenomenon occurs, gently wipe the contact surface with fine sandpaper, remove the oxide, and restore the normal working state of the contact.
2. Relay output is abnormal: sometimes, the relay may appear unstable output, the current is too large or the current is too small. This may be due to contact wear, loose contacts, or broken coil insulation. In this case, we can take the following repair methods:
-Replacement contact: If the contact is badly worn or loose, the problem can be repaired by replacing the relay contact. When replacing the contacts, pay attention to select the models and specifications that match the original contacts.
-Check coil insulation: use an insulation resisometer to measure the insulation resistance of the relay coil to ensure good insulation. If the insulation is damaged, the coil will cause abnormal output and the relay needs to be replaced.
3. Relay heating: sometimes, the relay will appear overheating during the use process. This may be caused by excessive load of relay, high temperature around relay or poor insulation of coil. In this case, we can take the following repair methods:
-Reduce the load: If the relay load is too large, the load should be appropriately reduced, in order to reduce the heating situation of the relay.
-Improve ventilation and heat dissipation: If the temperature around the relay is too high, the ventilation equipment or migration relay position can be added to improve the heat dissipation effect.
-Check coil insulation: As mentioned earlier, coil insulation problems may cause relay heating. Therefore, when the relay heating problem is found, the coil insulation situation should be checked in time.
2. Method to prevent relay failure
In addition to repairing relay faults, we can also take some precautions to extend the service life of relays and reduce the occurrence of faults.
1. Periodic maintenance: Regularly check and maintain the relays, including cleaning the contacts, checking the wiring for good contact, and checking the surrounding of the relay for signs of overheating and damage.
2. Reasonable design: When designing the circuit, ensure that the load of the relay is within the rated capacity range of the relay to avoid excessive load.
3. Correct use: Use the relay correctly and avoid excessive and frequent switching operation to reduce loss and wear.
4. Environmental control: keep the surrounding environment of the relay dry and clean, and control the temperature and humidity within the appropriate range.
5. Choose high-quality relay: choose reliable relay suppliers and products, and avoid using inferior relay, so as to reduce the probability of failure.
In conclusion, the performance of the relay failure can be determined by observation and measurement, while the repair method needs to be selected according to the specific situation. Regular maintenance, reasonable design, correct use, environmental control and selection of high-quality relays can reduce the occurrence of faults. Through the repair of the relay failure and the implementation of preventive measures, we can improve the reliability and service life of the relay, so as to ensure the normal operation of the circuit.
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