Common Faults of Relays
A relay is an automatic switch that requires a smaller current to control the larger current. It acts as an automatic adjustment, gives protection, and plays the role of a conversion circuit. The most often used relays include timer relay switch, electromagnetic relays, 12v timer, thermal relays, time delay relay, latching relay, off delay relay, and timer relay.
Type of Relays
Electromagnetic Relays: Electromagnetic Relays are composed of iron, coil, armature, etc. A specific voltage added to the two ends will lead to a current coil that will produce the
electromagnetic effect. Electromagnetic relays include magnetic holding relays, current relays, voltage relays, etc.
Thermal Relay: It consists of heating elements, action systems, reset mechanisms, etc. The production industry mainly uses the thermal relay due to its compatible size, simplified structure, and even cheaper.
Latching Relay or Magnetic Latching Relay: It has been recently developed; just like electromagnetic relays, it is an automatic switch. The only difference is that a permanent magnet affects the actions of the latching relays.
Timer Relay: It is an electrical component used with lower voltage to cut off or connect with a higher current. The timer relay switch is classified into two, that is, power-on time delay relay as well as power-off delay relay.
There are even control relays with a time delay inbuilt. You can use it to control an event according to time. On-time delay relays, you can open or close the contacts after or even before some time delay. Whereas in control relays, it happens after you apply a voltage. Hence, a time delay relay will consist of a general electromechanical relay as long as a control circuit that will help control the operation and timing of the relay.
A timer most commonly used in an electric circuit is delay timers, which do not allow the contact changeover until the preset time has been reached. You can use it with the help of the on-delay timer symbol.
Types of Failures in Relays
There might be multiple failures that might occur, including low product quality, poor maintenance, and improper usage of the relay.
Two aspects when detecting faults of Relay:
- Electromagnetic Component Failure
- Contact Components
The faults regarding Electromagnetic Component Failure are usually related to the coils, movement, and static iron.
- Coil failure: If the coils collide, they are likely to break when separated. Excess pressure can break the coil or the frame. Less pressure will loosen the winding and will increase the magnetic loss.
- Iron Core Failure: The armature makes a lot of noise that is caused due to the uneven contact of the moving surface and static iron. You might have to clean the oil stains. Then, you can release the armature on the spot after the power is shut. As the gap is too small, the performance is poor, and the surface is oily.
The use of Contact Components by relays for switching loads
The significant disadvantages are the contacts being too loose, cracked, excess in size, or deviated position. The faults usually include overheating of contact, wear and tear, and welding. Overheating happens due to insufficient capacity and contact pressure, oxidation, etc.
Different relays have varied reasons behind their failure. Some have a short life, while others with longer life fail as there is no mechanical action on the opening and closing of the relay switch.
Precautions when using Relays to avoid Faults
It is important to understand the characteristics while selecting the relay. One must also understand to take precautions to ensure a smooth operation of the relay.
- The functions of the relay should match with the product manual to meet the necessary
- According to different environments, the load and life will vary. It is best to confirm it before actual use.
- For DC relays, you can use rectangular wave control, whereas, for AC relays, experts recommend the sine wave control.
- Do not drop the relay or have any strong impact on it. You shouldn’t use the relays that have fallen. It is crucial to maintain relays for better performance.
- The temperature of the environment where you are using the relay should be as average as possible, with humidity and dust. There should be harmful gases that include sulfur,
nitrogen oxides, and silicon.
- Before using a latching relay, you will have to place it in action or reset position, depending on the required use. You must consider the polarity and pulse width when you are applying the voltage to the coil.
- For relays that are under polarization, you must pay attention to the polarity of the coil.
You must give the proper attention to these things when using a relay are Contact Protection, Coil, and the Type of the relay. Also, you must focus on the maximum voltage, coil temperature, leakage, performance, surroundings, shape, and installation. It would help if you also be careful when using a 12v timer because of its components.
If you face problems from time to time, then you can contact the relay manufacturer. The relay manufacturer can guide you in reasonably using the relay, as improper use can
decrease the life span of your machine.
Why must you opt for Geya relays?
GEYA is one of the best electrical manufacturing companies in China. It is China’s leading automation manufacturers. GEYA timer relay schematic symbol is flexible as well as easy to use and install. It provides the user with timing functions that will be suitable for varied applications. You can install it in the new as well as existing applications. It’s simple and time-based, has multiple modes, and an electronic display.
The monitoring relay by GEYA is also time-based and straightforward. It has adjustable ranges when it comes to timing and is designed for machine control and other applications. There are different monitoring relays with different functions: single-phase voltage monitoring relay, current monitoring relay, 3 phase voltage monitoring relay, etc.
Many problems can happen at the manufacturing level of Relays. Being the top electrical manufacturing company in China, GEYA has a documented process to ensure that the relays are manufactured with the highest quality input and a strict quality assurance process.