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Display cooler overload protector disassembly, diagnosis and repair
author: supermarket refrigerated showcase category: commercial refrigeration Views: 498Time: 2016-08-22
display cooler overload protector disassembly, diagnosis and repair
When the compressor is running normally, the display cooler overload protector should always be in the normal state, when the compressor is overcurrent or overheated When the time, it will automatically turn to the disconnected state, so as to achieve the purpose of protection.
(l) Disassembly and assembly of the overload protector, unplug the display cooler power supply, pry open the compressor accessory box, > record for sale, > remember the wiring method, > unplug or pry off the overload protector, and install the wiring when installing An > overload protector inserted into the compressor common terminal C must be inserted into the accessory box and fixed in the card slot. It must be close to the compressor shell, so that the display cooler compressor temperature can be correctly detected. 【Explanation】Generally, the compressor terminal C is located at the top. For special compressors, it can only be found by testing with a multimeter.
(2) Diagnosis of overload protector The damage of overload protector is mostly caused by poor internal contact, increased contact resistance or broken resistance wire. The former two will cause false protection and make intermittent clicks, while the latter compressor cannot get the working voltage and cannot work. Diagnosis method, it is observed that the internal resistance wire of the overload protector is broken or the bimetallic contact is deformed under normal temperature. Normally, the resistance of the overload protector at room temperature is 1Q~5Q, otherwise it means it has been damaged.
(3) The overload protector damage treatment is the same as the starter. The overload protector is also a vulnerable part. Because of its low price, it is generally only necessary to replace the starter of the same specification after damage. It cannot be replaced by a fuse or metal short circuit, otherwise the protection function will be lost.
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