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Commercial refrigeration maintenance experience
author: supermarket refrigerated showcase category: walk-in display coolers Views: 516Time: 2016-08-22
commercial refrigeration maintenance experience
ordinary commercial refrigeration maintenance experience
electrical system maintenance experience The highest failure rate of the electrical system is the overload protector and the starter, followed by the thermostat, the compressor failure rate is very low. Check the internal electrical system of the commercial refrigeration. Do not disassemble the components one by one for individual testing. Start with the directly measurable parts and gradually reduce the scope of maintenance until the fault is reduced to the minimum. There are two ways to reduce the scope of maintenance: measuring the resistance of the commercial refrigeration power plug and measuring the compressor inlet voltage.
Measure the resistance of the power plug to reduce the scope of inspection and use the RXI block to measure the resistance between the commercial refrigeration power plugs. The ground terminal and the other two terminals should be infinite. The measurement results between the two terminals of the power supply and the problems explained are as follows. The resistance value is basically normal: the electrical system using the PTC starter is a circuit composed of a thermostat, an overload protector, a compressor start winding and a PTC element in series, and then in parallel with the running winding. The resistance value is slightly less than the compression The resistance value of the machine running winding is basically positive and the normal range is 10Q~20Q. The electrical system of the heavy hammer start relay is a series circuit composed of a thermostat, an overload protector, a compressor running winding and a start coil winding. The resistance of the loop is basically equal to the resistance of the compressor running winding. The normal range of basic resistance is 10Q~20Q. Resistance value is too large: the resistance value is infinite, it is the compressor return to open circuit, mainly check the thermostat, overload protection, compressor and power cord; the resistance value is larger than the normal value, focus on the thermostat, overload protector contact resistance Be larger, and then consider the compressor coil problem and the contact situation of the connection point. Resistance value is too small: the resistance value is close to 0Q (ie short circuit), mainly to check the compressor, and for the rework machine, also consider whether the wiring is wrong; the resistance value is smaller than the normal value, and the overload protector and compressor are mainly considered. [Note] Common commercial refrigeration electrical system damage rates and corresponding phenomena are as follows. Damage to the overload protector: Most of the compressors do not operate without abnormal noise, and a few cause the compressor to do not operate and make clicks. Starter damage: 95% cause the compressor to stop running and make click sound, this is because the compressor does not start running, the current is large and the overload protector is protected, and only a few show that the compression does not run and there is no abnormal sound. The thermostat is damaged: open circuit causes the compressor to not work, adhesion causes the compressor to keep running, parameter changes cause the compressor to start and stop the time is relatively wrong. Compressor damage: Generally speaking, the normal resistance between the three terminals of the compressor basically means that there is no problem with the compressor, and the probability of an open circuit or short circuit in the compression coil is very low.
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