中国

The electrical appliance is broken, the capacitor is always wrong – what the Chinese and American engineers say

EDN previously published on the English website and Chinese website the article “The appliance is broken, the capacitor is always the fault”. The article points out that many test equipment failures are caused by electrolytic capacitor drying or tantalum capacitor failure. This apparently poked the pain of Chinese and American engineers. After reading this article, they replied with a message and shared the story of the capacitor they had experienced.timg

 

American engineers say so
@whitcwa

Although it is generally a problem with capacitors, it is also possible that the relay is faulty. One summer, my old Rheem central air conditioner broke down. I opened the lid and saw that the starting capacitor burned out. The running capacitor is still good, so I bought a new starting capacitor to replace the old one. After installation, I am proud to announce that I have fixed the air conditioner. Unexpectedly, less than a day, the air conditioner did not work anymore. I think it might be the bad capacitor again, just change it later. I didn’t expect to have a few days after the replacement, I realized that the problem may not be here. It is good to start the relay through the autotransformer test. This is a voltage relay with a nominal voltage of 330VAC, which is much more expensive than the capacitor. I put on the third capacitor and constantly switched the air conditioner power switch to monitor the start-up period. After about 10 cycles, I heard a click and the relay was closed and it was not broken. I got closer and wanted to take a closer look at what was going on. The boot capacitor exploded and the shell exploded. Fortunately my face was not blown up. Finally, I replaced the fourth capacitor and a new voltage relay to solve the problem completely. I don’t like this kind of intermittent problem.

@mattdem

I bought a new house 16 years ago. I replaced the original motor capacitor of the air conditioner about 4 years ago. It has been working normally after replacement. Perhaps the original capacitor of the air conditioner manufacturer is a bargain, and I replaced the capacitor with better quality.

@gregi75

I had a similar experience in May Day last year. My 15-year air conditioner was broken on Saturday before May Day, and there will be guests on the following Monday. Needless to say, if I want to replace the damaged capacitor, I have to pay extra for the weekend service. We had to arrange the guests to the home of the son who was 2 miles away from my home. I spent $12 on a capacitor from Amazon and replaced that bad one. Since then I have been leaving a spare capacitor in the garage. (FYI, the protruding part of the top of the capacitor shown in the text is a safety mechanism. If the internal pressure of the capacitor is too large, it will expand to disconnect the internal connection, so as to avoid overheating and explosion. I have encountered an explosion situation, then It’s not very fun.)

Chinese engineers say so
@奇迹
My 30-year-old electric fan lived after changing a capacitor.

@a_cloud
Last year, my family’s air-energy water heater could not be started normally. It was called after the maintenance personnel went to the door to check that it was a capacitor burned. Received more than one hundred for a capacitor, and also received 50 home service fees. Next time if the same fault occurs again, I will first check if the capacitor is broken. The core component of the air energy water heater is a compressor.

@苑齐鼎
Capacitors have a fatal weakness in insulation aging, especially black rod electrolytic capacitors. In addition, since the characteristics of the capacitor itself are often subjected to an instantaneous high voltage, it is more likely to cause breakdown.


Post time: Aug-09-2018
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