What is the cause of the abnormal noise of the 220 volt small relay

Caused by insufficient supply voltage of the coil.

Caused by insufficient supply voltage of the coil. The relay coil has a stable power supply voltage, and it will not make abnormal noise when it is reliably engaged. After starting, the power supply voltage of the relay coil is unstable, or the power supply fails to provide enough power to the relay, resulting in unstable relay engagement and a clicking sound.

Relay role.

The relay is an automatic switching element with isolation function, which is widely used in remote control, and the relay is an automatic switching element with isolation function, which is widely used in remote control, telemetry, and relays generally have an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); There is an actuator (output part) that can realize "on" and "off" control of the controlled circuit; Between the input and output parts of the relay, there is also an intermediate mechanism (drive part) that couples and isolates the input quantity, processes the function, and drives the output part.

Relay (English name: relay) is an electrical control device, which is an electrical appliance that makes a predetermined step change of the controlled quantity in the electrical output circuit when the change of the input quantity (excitation quantity) reaches the specified requirements. It has an interactive relationship between the control system (also known as the input loop) and the controlled system (also known as the output loop).

Usually used in the control circuit of automation, it is actually a kind of "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. ‍

The power supply voltage of the relay coil is unstable in the circuit, or the power supply fails to provide enough voltage to the relay, resulting in unstable relay suction and abnormal noise, you need to check the external wiring of the starting combination relay to see if there is a broken wire and fall off.

There is a disconnection in the circuit, resulting in a low output voltage at the neutral point of the alternator when the engine is running at medium speed, and the action voltage of the starting combination relay cannot be reached, so the starting combination relay contacts continue to open and close and squeak sound. When the engine is running at high speed, due to the high output voltage of the neutral point of the alternator, which can reach the action voltage of the starting combination relay, the charging indicator circuit is cut off, so the charging indicator is extinguished and the sound disappears.

There is an abnormal sound of the relay, that is, there is ash on the contact after the power is on, and the abnormal sound caused by the contact is not tightly closed, and the contact ash is blown away or wiped off when the power is not on, and the abnormal noise problem is solved.

It is mostly caused by the instability of the power supply voltage.

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1. The battery loses power

In addition to the quality and life of the battery itself, the loss of battery power is generally caused by the owner's own improper use, such as forgetting to turn off the headlights when parking, and too many external electrical appliances.

2. The smart key loses power

This question is only for cars with a push-start function. When your car key is close to you, but it can't be started when you press the one-button start button, and the smart key fault light on the dashboard is always on, then your smart key must be losing power.

Development History:

In the 18th century, scientists believed that electricity and magnetism were two physical phenomena that were incompatible. In 1820, the Danish physicist Oster discovered the magnetic effect of electric current, and in 1831, the British physicist Faraday discovered the phenomenon of electromagnetic induction. These discoveries confirmed that electrical and magnetic energy could be converted into each other, which also laid the foundation for the birth of later electric motors and generators; Because of these inventions, mankind has since entered the electric age.

In the thirties of the 19th century, American physicist Joseph Henry invented the relay using the phenomenon of electromagnetic induction while studying circuit control. The earliest relay is the electromagnetic relay, which uses the phenomenon of the magnetic force of the electromagnet to generate and disappear under the power on and off to control the opening and closing of another circuit with high voltage and high current, and its appearance makes the remote control and protection of the circuit go smoothly. Relay is a great invention in the history of human science and technology, which is not only the basis of electrical engineering, but also an important foundation of electronic technology and microelectronic technology.

the phenomenon of "squeak"; When the engine is running at high speed, the charging indicator circuit is cut off, so the charging indicator lights off and the sound disappears.

Because there is a disconnection in the circuit, the neutral output voltage of the alternator is low when the engine is running at medium speed, first check the external wiring of the starting combination relay, and no disconnection, falling off or other abnormal phenomena are found. If it's OK, you have to go to the maintenance shop to disassemble and inspect the alternator to see if the internal circuit is disconnected, because the neutral output voltage of the alternator is high, it can reach the action voltage of the starting combination relay, and the action voltage of the starting combination relay cannot be reached, so the starting combination relay contact keeps opening and closing and emits a "squeak."

1.There are foreign bodies on the pole surfaces of the moving and static iron core of the interlocking rough flow contactor. For example, when the product leaves the factory, the manufacturer usually coats a layer of petroleum jelly in order to prevent the core surface from rusting, but during installation, some rural electricians do not know or forget to scrub the petroleum jelly clean, and there is a lot of dirt on the forest for a long time; Some of them are used for a long time and the indoor air is humid, resulting in oxidation and rusting of the iron core polar surface.

These will lead to poor contact between the dynamic and static cores, resulting in high noise during the operation of the AC air digging ballast. 2.Some AC contactors are of inferior quality, and the polar surfaces of the moving and static iron cores are not smooth enough when leaving the factory; Some of them are used for a long time and are frequently engaged, resulting in a slight slope or unevenness of the polar surface of the dynamic and static iron core, resulting in poor contact after suction.

3.The contact overstroke of the AC contactor is too large, resulting in insufficient contact pressure between the dynamic and static cores. 4.

The co-pressure of the contact bullet or the release reaction spring force is too large, resulting in a certain gap between the dynamic and static cores during operation.

It is possible that the car will turn on the lights before starting, and the relay coil will have a stable power supply voltage, and there will be no abnormal sound if it is reliably engaged. After starting, the power supply voltage of the relay coil is unstable, or the power supply fails to provide enough power to the relay, resulting in unstable relay engagement and a clicking sound.

Automotive relay role:

1. Like the function of general relays, relays play the role of "switch" in the electrical automation industry, that is, by controlling the on-off of one circuit to control the intermediate link of the next circuit. Therefore, the role of automotive relays is to control the magnitude and on-off of current.

2. The function of the relay is to control the relay coil with a switch, and then the working contact of the relay is closed or disconnected, one end of the contact is connected to the main line current, and the other end is connected to the electrical appliance to be controlled, so as to realize the small current control of the large current, and prevent the switch switch from being burned out by the large current, which plays a protective role in the line and the switch.

3. As long as you lift the engine compartment cover and find the relay installation box, you can find the trace of the relay. Relays are used in automotive lights, wipers, starters, air conditioners, power seats, power doors and windows, anti-lock braking devices, suspension controls, audio, etc. There are two main parts of the control relay, one is the control system and the other is the controlled system.

Controlling a large current with a small current is the characteristic of the control relay.

Photo by Li Linwei of Pacific Automobile Network).