4 sino-overseas electric appbailce, no. 6 (total 60), 200o, 41 (total 266) refrigerator overload protector, may sometimes cause compressor motors to overload because of internal, external or mechanical failures. In order to avoid overloading, it is common to install overload protections in refrigerators and electrical circuits to ensure the operation is safe. The overload protector is actually a single-phase thermal protection, made up of electrical hot wires, double gold pieces and a pair of contact points (activated, static). An overloading shield is connected to the motor's operating ring, when the motor's overload is running, the current in the operating wire exceeds normal values, heats up the electrical wire and heats up the two-metal piece, heats up to a certain temperature, transforms the shape, drives the contact point apart from the static point of contact, and cuts off the circuit of the operating line, thus suspending the motor. When the two-metal piece cooled, it returned to its original position, connected to the circuit, and re-activated and operated. Normally, most of the start-up relays and overloaders used in refrigerators are mostly integrated or combined and are rarely separated. However, sometimes this kind of failure occurs in the use of refrigerators, where the refrigerator compressor is running very soon, and the shield is being overloaded, jumps off itself, cuts off power, the motor stops, and the compressor stops working. The main cause and method of handling this barrier is discussed below. The power voltage is too high and the line is overloaded, which may cause the overload protection to jump off, cut the circuit, and make the compressor motor stop. And if this is caused by the excess of the power voltage, the power is back to normal, and the compressor goes back to normal. 2. There are other heat sources in the vicinity of refrigerators that raise the temperature of the surface of the compressor 's crust without dispersing heat, so that the two-metal piece of the overloader is convulsed by heat transforms and jumps from the point of contact. The electrical motive has ceased to function. Method: keep refrigerators away from the heat source or avoid direct exposure to sunlight so that compressor surroundings maintain a better ventilated heat environment. 3. The seal of the refrigerator door is not sealed. As the door seals are deformed or cracks, causing a large amount of air escape inside the box, while the hot air outside the box invades the human box, causing a significant reduction in the system's cooling effect, resulting in a significant increase in the compressor load, which leads to a high rate of driving, shutdown, or overload protection contact adsorbing, and separation. The handling method: repair or replace door seals, close the doors, leave no “spill”4 refrigeration system with a small amount of leakage of refrigerants and mixed air, resulting in increased loads of compressors ... Resulting in a large increase in electrical motors and a large increase in electrical currents, exceeding the rated overload, the overload shield will automatically jump off and the motor will cease to function. Method of treatment: all leakage inspections of refrigeration systems are conducted and vacuums, refrigerants and seals are retrenched. Overload protections fail or are out of control, so that when there is no excess load on the circuit, the overload protections are wrongly moved, causing the motors not overloaded and automatically shut down, or the compressors are overloaded for long periods of time and the compressors are not moving, and the motors are not moving, and they are not protected, so that they become electric motor damage or damage. Method of handling: timely repair or replacement of overload protector 6. Commencing relay contact bonding without proper separation. When the compressor is activated and the motor is in operation, the trigger relay should be disconnected. If the contacts are sticky and unconnected, it will result in a reduction in the current value of the motor running circuit. The motor will stop. Treatment: fix or replace startup relays to keep startup relays in good working condition. 7. Compressor motor 7 local short circuit failure in inner circuits, electric motors working while running, significantly increased currents, caused overload protections to move, and contact jumps to shut down. Method of processing: the characterization parameters of the various circuits of the electric engine should be checked in a timely manner, and the compressor's shell should not be removed until the failure has been diagnosed, and the electrical motive should be removed for repair or replacement. 8. Compressor activation loads are significantly increased as a result of mechanical malfunctions in the compressor segment, making it difficult for compressor to start, or suspending the compressor for a short period of time, without even normal activation of the serious person. Method of processing: repair, troubleshooting or replacement of compressor university college of advanced studies, jiangsu province, 215,500)
