supermarket refrigerated showcase » article > commercial refrigeration > display cases Compressor disassembly, diagnosis and maintenance (3)
display cases Compressor disassembly, diagnosis and maintenance (3)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 498Time: 2016-08-22
display cases Compressor disassembly, diagnosis and maintenance (3)
The resistance between the terminal and the housing is greater than 2MQ. The resistance value of the running winding of the rotary compressor is generally 20Q-35Q, and the starting winding is 40Q-100Q. , The starting winding is 40Q~lOOQ. The start winding is 40Q~100Q. If there is infinity between any two terminals, the winding is open. When the start winding is open, after the display cases are energized, the overcurrent thermal protector will produce click and sound: the resistance between any two terminals is 0 or very small, indicating that the winding is short-circuited: there is resistance between any terminal and the shell It shows that the leakage of the motor and the housing will cause the display cases to become live. [Note] Although the resistance between the terminals of each type of compressor is not the same, the probability of the compressor windings becoming larger or smaller is extremely low, and if it is damaged, it is also an open circuit.
(2) Compressor leak diagnosis Compressor pressure check and repair welding. 95% of the leaks of the compressor have oil stains, which generally occur at the root of the high-pressure or low-pressure nozzle and the joint between the upper and lower shells. After the compressor is individually pressured to 1.2MPa, apply soapy water to the suspected leakage point, and cover the bottom with your hands. If there are bubbles, the compressor is indeed leaking. Cooling measures should be taken to compensate for the compressor leakage. Use a saw blade to polish the leaking point and place the compressor in the water. Be careful not to let the water flow over the leaking point of the compressor. Then use a brass electrode to repair the leakage of the air welding. The welding time for the same part should not be too long. After welding, use a damp cloth to cool the welding joint to prevent overheating of the welding part and damage the internal components of the compressor. After repairing the leak, the compressor should be tested for pressure and leak detection.
(3) Compressor jam diagnosis Compressor jammed cylinder is also called shaft-holding. As the name implies, a certain part of the inside is stuck. The performance in display cases is that the compressor does not start, and the compressor sounds buzzing , display cases The current is large. When measuring the compressor inlet voltage is normal, the compressor terminal resistance is normal, continuously replacing an overload protector, and the two starters still cannot eliminate the fault, check whether the compressor is stuck.
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