First, the condition that the relay is not turned on
1. If the load current exceeds the rated conversion current of the relay, the relay will have a short circuit fault, and the relay with a large rated voltage should be replaced
2. At the working temperature of the relay, if the heat pipe heat dissipation is not good, the output integrated circuit process will be destroyed, so that the application is large or more reasonable.
3. The line voltage transient causes a part of the relay output to pass through, so that the relay with high rated current can be applied or an additional transient maintenance power supply circuit is presented.
4. The line voltage applied is higher than the rated voltage of the relay.
Second, the relay is only broken after disconnecting and typing
At the time when the relay should be cut off, accurately measure the typed working voltage, if the measured working voltage is less than the necessary release of the working voltage, the surface relay is released out of the working voltage is too low, the relay should be disassembled; If the operating voltage is higher than that released by the relay, it indicates that the route problem in front of the input terminal needs to be corrected.
3. The relay is turned on
1. When the relay should be turned on, accurately measure the keyed working voltage, if it is less than the necessary working voltage, it shows the route problem in front of the keying terminal; If it is higher than the necessary working voltage, check the optical rotation of the switching power supply and correct it in many ways.
2. Accurately measure the key part of the relay, if there is no current, the relay is open and the relay fails; If there is a current amount but less than the operating value of the relay, it is a fault of the distribution line in front.
3. Check the keying part of the relay, accurately measure the working voltage of each section of the output, the working voltage is less than 1V, indicating that the route or load outside the relay is open, and maintenance should be carried out; If there is a working voltage, there will be a load short-circuit fault, which will cause the current to be too large and the relay will be invalid
Fourth, the relay is arc in operation
1. Check whether all the wiring is appropriate, and the fault caused by the connection is not firm or incorrect.
2. The type and output leads are not together.
3. For the very smart intermediate relay (SSR), the noise can also be combined to the input end to cause a conduction arc
4. The AC motor or solenoid is loaded and causes shaking
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