I suppose I'm saving it for a last-minute desperation move, I'll be able to rationalize it better if things get that bad. Actually, my hair's driving me nuts. Didn't realize it was getting so long until I was under the car last weekend. Of course. If I had no tach it wouldn't start in the first place. Jeez, it's like I've forgotten every thing I ever knew.. I'm betting you're right about the crank sensor.
If you're not right, it almost has to be the pump. For now, I think I'm actually going to put the relays back into the green C and mount the good tires on it as well. It has some cooling fan speed problems at the moment, either high speed or nothing , but I think that might go away if I clean all the wiring connectors. Even if that doesn't work, hey.. I know the green one hasn't had ignition switch done yet, but last time I used it as a DD it didn't die in the middle of the street more than once or twice a month.
Paul, seriously.. Don't forget your diagnosis over the interwebz was better than mine while I could actually touch the stupid car.. No problem. Think of it as a factory installed magnetic drain plug. You'll need to log in to post. Log in. Login Digital Edition Buy a Subscription. Forums » Grassroots Motorsports » How do relays fail? Sometimes it gets wonky first, then it quits. Also, sometimes that corrosion builds up and prevents the relay from breaking contact.
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.
Precautions when using Relays to avoid Faults It is important to understand the characteristics while selecting the relay. The functions of the relay should match with the product manual to meet the necessary parameters. 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. 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. Why must you opt for Geya relays? Previous Post Previous Post. Next Post Next Post. Leave a Reply Cancel Comment. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits.
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Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. If there is oil stains, it can be cleaned. The break of the short-circuit ring can also cause loud noise.
After the power is off, the armature cannot be released immediately, which may be caused by the moving iron core being stuck, the iron core air gap is too small, the performance is poor, and the iron core contact surface is oily.
During maintenance, the air gap can be adjusted to 0. The edges and corners and the shaft are worn out, causing the armature to turn ineffectively or stuck. In some DC relays, due to mechanical wear, or damage to the non-magnetic gasket, the minimum air gap after the armature is closed becomes smaller, and the residual magnetism is too large, resulting in a malfunction that the armature cannot be released.
When the sub-magnetic ring on the iron core of the AC relay is broken, or the armature and the pole face of the iron core are rusted or invaded, it will cause the armature to vibrate and generate noise.
In the e-core of the AC relay, when the air gap of the center column disappears due to the abrasion of the cores on both sides, the armature sticks and cannot be released. Contacts are electrical contact parts used by relays to switch loads.
Some products' contacts are press-fitted by riveting. The main drawbacks are loose contacts, cracks in the contacts, or excessive size and position deviation.
This will affect the contact reliability of the relay. The faults of contact components generally include contact overheating, wear, and welding. The causes of contact overheating include insufficient capacity, insufficient contact pressure, surface oxidation or dirty, etc. Due to the mechanical engagement of the contacts the needle-shaped protrusions and pits formed on the contacts bite each other , welding or cold welding, the phenomenon that they cannot be disconnected occurs.
A phenomenon in which the circuit cannot be connected normally due to increased contact resistance and instability. The contact cannot be open or close the circuit due to excessive load, small contact capacity, or change of load nature.
Because the voltage is too high, or the contact distance becomes smaller, the contact gap re-breaks down. Because the frequency is too high, or the contact gap is too large, a fault that cannot accurately breaking the circuit occurs. Due to various environmental conditions that do not meet the requirements, errors in contact work are caused. Because there is no arc extinguishing device or measure, or improper selection of parameters, the contacts are worn out or unnecessary interference is generated.
Check the surface condition of the contact. If the contact surface is oxidized, the silver contact is not required to be repaired. The copper contact can be filed with a polished file or gently scraped off the surface oxide layer with an electrician's knife. If the surface of the contact is not clean, it can be cleaned with gasoline or carbon tetrachloride; there are burn marks on the surface of the contact, which can be repaired with a polished file or a knife, but do not use emery cloth or sandpaper to polish it to avoid residual sand and cause poor contact.
If the contacts are welded, they should be replaced. If the contact capacity is too small, replace the relay with a larger capacity. If the contact pressure is not enough, the spring can be adjusted or replaced to increase the pressure.
If the pressure is still insufficient, the contacts should be replaced. After riveting, the parts are bent, skewed, and the pier is thick and black, which will cause difficulties in the assembly or adjustment of the next process, and even cause scrap.
The main reason for this problem is that the riveted parts are too long, too short or the force is uneven during riveting, the die assembly deviation or the design size is wrong, and the parts are not placed properly. Why is this the case? It is simple — most relays have moving parts except for solid state to achieve electrical switching using a coil and a set of contacts and anything that moves mechanical is going to suffer an eventual failure.
The term relay can describe a variety of components in your machine systems. Here we will go over a few of them and what causes them to fail. These are one of the most common and oldest types of relays. Originally, they were invented for amplifying signals in telegraph systems.
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