After the high and low temperature test chambers were bought back to the company, the most feared thing was to meet all kinds of incurable diseases. For example, why does the high and low temperature test chamber not cool down or slow down, does not heat up or slow down, the light does not light, the machine does not work, etc. You want to know, you don't want to know, you know, you don't know, Xiaobian I can tell you all about it. Let's take a look at it. When using high and low temperature test chambers, what are the most difficult problems encountered, and which ones are the most annoying? Let's take a look.
Why does the high and low temperature test chamber not cool down or slow down?
When the test box does not cool down, the ambient temperature should first be reduced to between 5 °C and 28 °C. Then check whether the air-cooled condenser is too thick and the accumulated dust is too thick. The dust on the condenser can be used (purge with a compressed air air gun). If the surface of the condenser is very clean or a new machine, you should watch the reading of the refrigeration pressure gauge. The static pressure is usually 6 kg (or 90 psi, Above the pressure gauge, the innermost pressure of the pressure gauge is as specified in Figure 3. (The black line is marked on the pressure gauge when it is shipped from the factory.) If it is lower, there may be leakage of refrigerant, resulting in insufficient cooling capacity. Cooling System.
Why doesn't the high and low temperature test chambers heat up or not?
If the test box does not heat up, first turn off the main power of the machine, check if the heating circuit breaker has tripped, if it is, then close it. If not, continue to check it down. First, use the resistance of the multimeter to measure the solid state relay. Is there a resistance of about 20 ohms between the output (2 feet) and the N line (depending on the different models), if not, the heating wire is open, and the heating wire is checked for damage; if the heating wire is not If it is damaged, open the side cover of the power distribution box to keep the machine running and warm up. Observe whether the conduction indicator on the solid state relay is lit. If it is lit, (use the voltage of the multimeter to measure the output of the solid state relay ( 1 foot) Is there 220V voltage for the N line? If not, check the contactor again. If there is, measure the output of the solid state relay (2 feet). Is there 220V voltage for the N line? If not, the solid state relay If the internal open circuit is damaged, it must be replaced. Secondly, if the conduction indicator on the solid state relay is not lit, use the DC voltage file of the meter to measure whether the input terminal (3+, 4-) has a signal voltage of 12V or more, such as No, there may be no output or damage to the controller. Finally, check whether the heater is damaged, remove the sealing plate inside the high and low temperature test box, and use the universal meter to measure whether the two ends of the heating wire are conducting. It is good, otherwise it proves that it is damaged and can be replaced.
Why does the high and low temperature test box not illuminate?
1. Turn on the light switch to see if the switch is broken; 2. Replace the rectifier; 3. Check if the filament of the lamp is intact. If you see the filament is black, you can judge that the filament is damaged. If the filament is good, you need to The bulb lead-out wire on the switchboard is cut open, and the source meter is used to measure whether the line is electrically connected to the machine casing. If it is not, the lamp is damaged or a part of the line is broken. What are the most annoying problems in high and low temperature test chambers?
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