introduction
In the process of use for a long time, relays may inevitably be seriously worn in industrial or daily use, which might cause mechanical equipment malfunctions. So, once we encounter such situations, how should we respond? General relay faults can be divided into external, internal, and functional faults. Below, let me classify the causes of these faults one by one and present the corresponding solutions.
The steps for repairing the relay near me include the following:
Diagnosis of the relay fault
Appearance observation
First of all, it is necessary to check the appearance-if there is any damage, deformation, or burning on the housing of the relay. If so, that may be a serious malfunction inside the relay. Further, one should check the relay for loose, oxidized, or bent pins. Such a bad connection of the pins may be the root cause of malfunctioning inside the relay.
Measure resistance
Resistance measurement of the relay coil using a multimeter: move the switch to the resistance range on the multimeter and, separately, measure the resistance between the two pins of the coil. Under normal conditions, the coil resistance should fall in its specified range. In case the value shows infinity or too small, then there is an open or short circuit fault in the coil.
Measure the resistance of relay contacts. Using the multimeter on the resistance range, without powering the relay, measure the resistance between NO and NC. The resistance between the normally open contacts should be infinite and that between the normally closed should be zero under normal conditions. If the resistance value does not reach to requirement, it indicates that maybe a fault in the contact.
Power on test
Connect the relay to an appropriate power source and load for power on testing. Observe whether the relay can be normally closed and released, and whether the load can work properly.
If it cannot be pulled in, there may be a fault in the open circuit, short circuit, or inadequate power supply voltage of the coil circuit. If it is pulled in but cannot be released, there may be adhesion of contacts or mechanical failure.
Maintenance method of relay
Clean and tighten the pin end
If there is some dust, oil stain, or other impurities on the appearance of the relay, clean it with a cleaning agent and a clean cloth. The casing and pins of the relay should be clean and tidy for good electrical connection. Check whether the pin of the relay is loose or not. In case any loosening is observed, screwdrivers or pliers may be used to tighten the pins. One must ensure that the connection of the pin with the circuit board or socket is tight and secure.
Replace the coil
If there were fault in open circuit or short circuit of the coil, it should be replaced, that is to say, confirm the model and parameters first then replace the relay coil with the same specification.
When replacing, it should pay attention to the installation direction and position of the coil and correctly match the iron core and contact of the relay. Meanwhile, it should pay attention to the welding quality to ensure the firm and reliable connection between the pins of the coil and the circuit board or socket.
Repair the contact points
If the contacts happen to have adhesion, oxidation, or wear faults, then tools such as fine sandpaper or a file can be used to clean and repair the contacts. Remove oxides and impurities from the contact surface for good conductivity.
If the wear of the contact is serious and can't be repaired, then it can be replaced. While replacing the contacts, the same specification and materials are to be considered to replace the old contacts, and correct installation should be ensured. At the same time, attention should be paid to adjusting the pressure and clearance of the contacts to ensure good contact and reliable operation of the contacts.
Check mechanical parts
In case of a relay mechanical failure such as iron core jamming, spring failure, etc., check the mechanical parts of the relay. Open the relay cover and check whether the iron core, spring and armature etc are normal or not. If damaged or deformed, repair or replace with a new one.
During inspection, the sequence for installation of mechanical parts should be indicated, and accurate position and coordination among every component should be assured. In the meantime, lubrication and adjustment should be in observation so that good mechanical properties of the relay can be guaranteed
Test and verify
functional check
Functional test: After the repair is completed, it shall do a functional test on the relay by normally pulling and releasing it to check if its load will be able to function well or not. The power-on test shall be conducted by connecting the relay with proper power and load.
The multimeters can be used for measurement parameters like coil resistance, contact resistance of relays, and many more to check if the repaired relay meets the requirements.
Reliability testing
In order to make the repaired relay have enough reliability, some reliability tests can be taken. For example, a great amount of pull in and release tests can be conducted on the relay to see whether it can work stably. And it can be put into high temperature, low temperature, humidity and other environmental tests to see its performance in different environments.
A repaired relay could be installed into real equipment for a test to verify its reliability and stability, if possible.
summary
It should be noted that when repairing relays, it is important to ensure safe operation and avoid electric shock and other hazards. If you are unfamiliar or unsure about the maintenance of relays, it is recommended to seek the help of professional electronic repair personnel. The most important thing is to choose the right relay, a good relay can make the equipment performance more stable and have a longer lifespan. The relays provided by QIANJI can meet your needs. QIANJI is a relay supplier with over 20 years of experience, focusing on providing high-quality relays to global customers
label:how to repair a relay,relay repair near me,Relay maintenance