What is Common Faults of Relays?

The relay is an automatic switch that requires a smaller current to control a larger current. It plays the role of automatic adjustment, protection and conversion circuit. The most commonly used relays include timer relay switches, electromagnetic relays, 12v timers, thermal relays, delay relays, latching relays, delay relays and timer relays.

1. Type of relay

The relay can be divided into electromagnetic relay, thermal relay, latching relay or magnetic latching relay, timer relay, and some built-in delay control relay.

Electromagnetic relay

Electromagnetic relay is composed of iron, coil, armature, etc. A specific voltage applied to both ends will cause a current coil, which will produce electromagnetic relay. Electromagnetic relays include magnetic latching relays, current relays, voltage relays, and so on.

Thermal relay

It is composed of heating element, action system, reset mechanism, etc. Due to the compatible size, simplified structure and cheaper price of thermal relays, thermal relays are mainly used in the production industry.

Latching relay or magnetic latching relay

It is recently developed; just like an electromagnetic relay, it is an automatic switch. The only difference is that the permanent magnet will affect the action of the latching relay.

Timer relay

It is an electrical component that uses a lower voltage to cut off or connect a higher current. The timer relay switch is divided into two types: power-on delay relay and power-off delay relay.

There is even a built-in delay control relay. You can use it to control events based on time. On the delay relay, you can open or close the contact after or before the delay. In control relays, it occurs after voltage is applied. As long as a control circuit controls the operation and timing of the relay, a time delay relay will include a general electromechanical relay.

The most commonly used timer in the circuit is the delay timer, which does not allow contact switching until the predetermined time is reached. You can use it with the help of the delay timer symbol.

2. Type of Relay fault

Various failures may occur, including low product quality, poor maintenance, and improper use of relays.

Two aspects of detecting relay failure:

  • Electromagnetic component failure
  • Contact components

Electromagnetic component failures are usually related to coils, motion and static electricity.

  • Coil failure

If the coils collide, they are likely to break during separation. Excessive pressure may break the coil or frame. Too little pressure will loosen the windings and increase the magnetic loss.

  • Iron core failure

Due to uneven contact between the moving surface and static electricity, the armature produces a lot of noise. You may have to clean up the oil stains. Then, after turning off the power, the armature can be loosened on site. Because the gap is too small, the performance is poor, and the surface has oil stains.

3. Relays use contact components to switch loads

The notable shortcomings are that the contacts are too loose, cracked, oversized, or out of position. Failures usually include contact overheating, wear and welding. Overheating is caused by insufficient capacity, insufficient contact pressure, oxidation, etc.

Different relays have different reasons for failure. Some have a shorter lifespan, while others have a longer lifespan and fail due to no mechanical action on the opening and closing of the relay switch.

4. Precautions when using relays to avoid malfunctions

When choosing a relay, it is important to understand its characteristics. People must also understand to take precautions to ensure the smooth operation of the relay.

  • The function of the relay should match the product manual to meet the necessary requirements parameter.
  • According to different environments, the load and life will be different. It is best to confirm before actual use.
  • For DC relays, rectangular wave control can be used, while for AC relays, experts recommend using sine wave control.
  • Do not drop the relay or subject it to any strong impact. You shouldn’t use the used relay. In order to obtain better performance, maintaining the relay is essential.
  • The ambient temperature of the relay should be kept at an average temperature as much as possible, with humidity and dust. There should be harmful gases, including sulfur,

5. Nitrogen oxide and silicon

Before using the latching relay, you must place it in the action or reset position as needed. When you apply voltage to the coil, you must consider the polarity and pulse width.

For polarized relays, you must pay attention to the polarity of the coil.

When using a relay, you must pay due attention to these things: contact protection, coil and relay type. In addition, you must pay attention to the maximum voltage, coil temperature, leakage, performance, environment, shape and installation. If you are also careful when using the 12v timer, it will help because of its components.

If you encounter problems from time to time, then you can contact the relay manufacturer. The relay manufacturer can guide you to use the relay reasonably, just like incorrect use reduce the life of your machine.

6. Why do you have to choose Alion Relay?

Alion is one of the best electrical manufacturing companies in China. It is a leading automation manufacturer in China. The schematic symbol of ALION timer relay is flexible, easy to use and install. It provides users with timing functions suitable for various applications. You can install it in new and existing applications. It is simple, based on time, has multiple modes, and has an electronic display.

ALION’s monitoring relay is also time-based and very simple. It has an adjustable range, its timing and design for machine control and other applications. Monitoring relays with different functions: single-phase voltage monitoring relay, current monitoring relay, three-phase voltage monitoring relay, etc.

Many problems may occur at the manufacturing level of the relay. As China’s top electrical manufacturing company, ALION has a documented process to ensure the production of relays with the highest quality input and strict quality assurance process.

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