Most customers have some minor problems at the beginning of the use of high and low temperature alternating test boxes. What is the reason that the refrigeration compressor of the high and low temperature alternating test box does not start normally?
The following details for everyone:
Point, to see the main circuit, the power supply is not charged, the fuse is not burned, the switch contact is not outstanding contact, is not missing phase operation. When the three-phase power source is burned out of phase, the motor can roll, but the sound is abnormal and the speed is slowed down. Find this condition should be parked immediately, otherwise simply burn the motor.
At two o'clock, if the power supply voltage is too low, the sound of the motor will not be normal after starting. The voltage should not be less than 90% of the extra voltage, otherwise the extra power of the motor is significantly reduced and the compressor cannot be pulled. When the input line allows the current to be smaller, the motor cannot be satisfied, and the motor cannot drag the compressor.
At three o'clock, the differential pressure relays and high and low voltage relays should be viewed. The differential pressure relays and the high and low voltage relays are the protection relays adopted for the safe operation of the refrigerator. When the refrigerator oil pressure (high pressure and low pressure) is abnormal, the refrigerator will stop operating.
At four o'clock, when the working medium of the temperature relay thermal bag leaks, or the conditioning is wrong, the contact is normally open and cannot be started. If the leakage of the working fluid is discriminated, rotate the relay conditioning lever to the low temperature scale area to see if the contact is closed. If it is not closed, remove the temperature relay and immerse the temperature-sensing bag in warm water, and then see if the contact is moving. If it is still unacceptable, it is proved that the refrigerant in the temperature-sensing bag leaks and needs to be repaired.
At five o'clock, the chiller cannot be started when the shaft of the connecting rod is large, and the shaft of the crankshaft occurs before and after the bearing. In addition, because the exhaust gas temperature is too high, the oil is coked, and when the vehicle is cooled, the coking refrigeration oil sticks the cylinder to the piston, forcing the refrigerator to fail. As a general rule, before the start of the car, if it proves that the mechanical resistance of the day, the refrigerator can not start, purely electrical problems.
The high and low temperature alternating test box is used to test the degree to which the material can be accepted in an extremely low temperature and extremely low temperature environment in an instant, so as to test the high and low temperature repeated tensile force and the product heat in a short period of time. The chemical changes or physical damage caused by expansion and contraction of the cold can recognize the quality of the goods, from fine ICs to heavy mechanical components, and they all need its ambition test.
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