The reason why the high and low temperature test box can't drop the temperature and the maintenance method The high and low temperature test box, that is, the high and low temperature cycle test box, is mainly used to simulate high temperature, low temperature, high and low temperature cycling alternating environment, suitable for electrical and electronic products, optoelectronic communications, LED semiconductors Parts and materials of related products such as automobiles, motorcycles, metal molds, plastics and chemicals, packaging and printing, aerospace, marine weapons, colleges and universities, research institutes, etc., are subjected to suitability tests under high temperature or low temperature environment for storage and operation.
When customers use the high and low temperature test box, they may encounter the following conditions: high and low temperature box temperature can not be constant, high and low temperature test box can not drop the temperature, high and low temperature cycle box can not reach the low temperature, high and low temperature test box temperature fluctuation deviation ... Corwin gives you some of the reasons for the failure, for the majority of users.
Reason one:
1. The cause of the failure was not determined, and the cause of the failure was further confirmed by the control process of the high-low temperature test chamber. The test chamber had two sets of refrigeration units.
2. One is the main unit and the other is the auxiliary unit. When the cooling rate is relatively high, the two units work at the same time. In the initial stage of the temperature maintenance period, the two units still work simultaneously. When the temperature is initially stabilized, the auxiliary unit stops working and the host group maintains the temperature stability. If the host group R23 is leaked, the cooling effect of the host group will be small. Since the two units work at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the indicated cooling rate is reduced. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test chamber will slowly rise. When the temperature rises to a certain extent, the control system will start the auxiliary unit to cool down the temperature and set the temperature down. In the vicinity of the fixed value (-55°C), the auxiliary unit stopped working again.
Reason two:
1. The temperature of the high and low temperature box cannot be kept constant Because the temperature cannot be maintained, observe whether the refrigerating compressor can be started during the operation of the test box. The compressor can be started during the operation of the environmental test equipment, indicating that the main power supply to each compressor The electrical circuit is normal and there are no problems with the electrical system.
2. There is no problem with the electrical system and continue to check the refrigeration system. First of all, it is checked that the exhaust and suction pressures of low-temperature (R23) compressors of the two sets of refrigeration units are lower than normal and the suction pressure is in a pumped-out state, indicating that the amount of refrigerant in the main refrigeration units is insufficient.
3. Touch the exhaust and suction piping of the R23 compressor of the main unit and find that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (unfrosted). This also explains the host group. The lack of R23 refrigerant.
When the user can not solve the above problems, please contact Corwin immediately. We will send professional and technical personnel to answer the troubleshooting. Thank you for your constant support of Kevin!
When customers use the high and low temperature test box, they may encounter the following conditions: high and low temperature box temperature can not be constant, high and low temperature test box can not drop the temperature, high and low temperature cycle box can not reach the low temperature, high and low temperature test box temperature fluctuation deviation ... Corwin gives you some of the reasons for the failure, for the majority of users.
Reason one:
1. The cause of the failure was not determined, and the cause of the failure was further confirmed by the control process of the high-low temperature test chamber. The test chamber had two sets of refrigeration units.
2. One is the main unit and the other is the auxiliary unit. When the cooling rate is relatively high, the two units work at the same time. In the initial stage of the temperature maintenance period, the two units still work simultaneously. When the temperature is initially stabilized, the auxiliary unit stops working and the host group maintains the temperature stability. If the host group R23 is leaked, the cooling effect of the host group will be small. Since the two units work at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the indicated cooling rate is reduced. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test chamber will slowly rise. When the temperature rises to a certain extent, the control system will start the auxiliary unit to cool down the temperature and set the temperature down. In the vicinity of the fixed value (-55°C), the auxiliary unit stopped working again.
Reason two:
1. The temperature of the high and low temperature box cannot be kept constant Because the temperature cannot be maintained, observe whether the refrigerating compressor can be started during the operation of the test box. The compressor can be started during the operation of the environmental test equipment, indicating that the main power supply to each compressor The electrical circuit is normal and there are no problems with the electrical system.
2. There is no problem with the electrical system and continue to check the refrigeration system. First of all, it is checked that the exhaust and suction pressures of low-temperature (R23) compressors of the two sets of refrigeration units are lower than normal and the suction pressure is in a pumped-out state, indicating that the amount of refrigerant in the main refrigeration units is insufficient.
3. Touch the exhaust and suction piping of the R23 compressor of the main unit and find that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (unfrosted). This also explains the host group. The lack of R23 refrigerant.
When the user can not solve the above problems, please contact Corwin immediately. We will send professional and technical personnel to answer the troubleshooting. Thank you for your constant support of Kevin!
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