Use the high and low temperature alternating humid heat test chamber to solve the problem corresponding to different status quo

First, grasp some common fault conditions of high temperature test chambers, and find solutions for the conditions! Because the high temperature test chamber is a machine and equipment with electrical equipment and several systems and software such as refrigeration machinery and equipment, if there is a problem with the machinery and equipment, it is necessary to comprehensively carry out regular inspection and comprehensive analysis
of all the machinery and equipment.

The following is a basic grasp of some common fault conditions of the high temperature test chamber to help everyone find a way to deal with it: (1) If the environmental test chamber can be overcooled, it can show that the problem of cooling circulating water of external factors is removed, and the people below deepen it to check
.

(2) If the temperature cannot be maintained
.

At this time, it should be observed whether the refrigeration unit can start normally in the whole process of the operation of the environmental test chamber, and the refrigeration compressor can start in the whole process of the operation of the environmental test chamber, indicating that the household appliance route from the main switching power supply to each refrigeration compressor is normal, and there is no problem
at the software level of the household appliance system of the environmental test chamber.

(3) There is no problem in the circuit system, and the refrigeration unit
is checked again.

The exhaust pipe and respiratory working pressure of the ultra-low temperature (R23) class refrigeration compressor of the 2 groups of refrigeration units were first inspected, if the values of these 2 indicators were slightly lower than the standard values, and the breathing working pressure was time-pumping, indicating that the amount of refrigerant in the main refrigeration unit was not enough
.

Touch the exhaust pipe and breathing pipe of the main generator set R23 refrigeration compressor with your hand, if you find that the temperature of the exhaust line is not high, the temperature of the breathing pipe is not low (no frost), which also indicates that the R23 refrigerant of the main generator set is lacking, and the system software leaks fluorine
.

(4) The common fault cause is not determined, and the whole process of operation of the fusion environmental test chamber is deepened to determine the common fault cause, which has two refrigeration units
.

One is the leading generator set, the other is the auxiliary generator set, when the cooling rate is very large, the 2 sets of generator sets work together, and in the early stage of the temperature maintenance link, the 2 sets of generator sets are still working
together.

When your temperature is basically stable, the auxiliary generator set will terminate the work, and the main generator set will maintain the temperature stability
.

If the main generator set R23 leaks, the actual effect of cooling of the main generator set is not large, because in the whole process of dewarming, the two generator sets work together, so there is no temperature stability can not be stable, and the temperature reduction speed is reduced
.

In the temperature maintenance link, if the auxiliary generator set terminates the work, the main generator set has no cooling effect, the gas in the experimental box will rise slowly, when the temperature rises to the necessary level, the automatic control system will start the auxiliary generator set to reduce the temperature, reduce the temperature to the preset value (-55 ° C) around, and then the auxiliary generator set and terminate the work, so continuously, there will be common fault conditions
as shown in 3.

At this point, it has been determined that the reason for the common fault of the production and manufacturing is the leakage
of the refrigerant R23 of the ultra-low temperature (R23) stage generator set of the main generator set.

(5) People later carry out leaks
in the refrigeration unit.

With the leak detector and soap liquid closely combined way to check, if a heat flow bypass valve relay stem has a slight gap, you need to disassemble the relay, the system is refilled with fluoride, the system software works normally
.

Because the above can be seen that the analysis and resolution of the common fault conditions are mostly easy to difficult, first "outside" after "inside", first "electrical equipment" and then "cold" of the plurality of analysis and discrimination, to understand and master the basic principles of the environmental test chamber The whole process of work is the basis for
analyzing common faults to distinguish common faults.

"Grasp some common fault conditions of high-temperature test chambers and find solutions for them!" It is our maintenance professional and technical personnel combined with the actual experience sharing, to help everyone to grasp the common fault conditions of the high temperature test chamber very well!