Danfoss Compressor SH240A7AJB

06/20/2020

What are the causes of air conditioning trip

What are the causes of air conditioning trip 1. The contradiction between the rated current of the air conditioner and the current carrying capacity of the wire. 　　Here are two formulas involved: 　　①The rated current of air conditioner I=P÷U ÷power factor, the power remains unchanged, the smaller the voltage, the greater the current required. 　　② The current carrying capacity of the wire I=U÷R, the voltage is proportional to the current. 　　 So when the power supply voltage is normal, we must consider the line voltage drop. The longer the line, the greater the resistance, the greater the voltage drop, and the smaller the output current at the end. However, because the power of the load remains unchanged, the voltage becomes smaller, and the current that needs to be output will be larger. At this time, the wire is forced to overload, and the time will cause heating, and eventually cause the tripping of the open circuit. 　　 Some friends said that the heat of the wire will not cause the tripping of the circuit breaker. In fact, the manufacturer of the air switch has made it clear in the relevant manuals that the heat of the wire will cause the air switch to trip. Because the wire heats up, the crimp terminal will also heat up, and the resistance will become larger and larger. The larger the resistance, the greater the current consumption, and the hotter it will be, a vicious cycle. 　　 2. Leakage 　　During the daily maintenance work, we will encounter the situation that the air circuit trips due to the leakage of electricity. At least I have not experienced it once or twice. Regardless of the leakage of the neutral line or the leakage of the live line, a long time will cause the circuit breaker to trip. 　　Why does the electric leakage cause the MCB to trip? There are two situations. 　　 ① Good grounding. At the beginning, the leakage current was not large, and as time went by, the leakage current became larger and larger, and eventually evolved into a short circuit to ground, unable to close. 　　②There is no ground wire. If the equipment is not connected to the protective ground, when the wire leaks to the equipment, it is equivalent to adding a large shunt resistance. Like this problem, if the air conditioner does not have a ground wire, when the wire leaks to the air conditioner, the air conditioner is a very large shunt resistor and will consume a lot of current. Eventually, the wire will heat up or trip open. 　　How to determine whether the trip caused by the above two aspects can be done with a clamp ammeter. 　　 ① Measure the voltage at the input and output to see if there is a significant change in voltage drop. 　　②Measure whether the output current exceeds the standard. 　　 So my suggestion is: first measure the supply voltage to see if it is within the allowable fluctuation range. Then measure the current to see if it exceeds the rated ampacity of the wire. Finally, check the data one by one according to the measured data to find out the reason.

06/16/2020

Detailed analysis of the new fully enclosed compressor in the helicopter environmental control system

Detailed analysis of the new fully enclosed compressor in the helicopter environmental control system With the changes in actual demand and technological progress, the refrigeration compressor in the helicopter environmental control system will use an in器2䀀
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08/03/2020

How to solve the continuous cooling of high-density computer rooms?

Faced with the development trend of high-density computer rooms, the configuration of continuous refrigeration facilities to maintain equipment operation during power outages and chiller restarts and protect equipment safety is an important issue that must be considered by the construction party and design unit. At present, all parties are actively exploring And implementation.

08/24/2020

Six steps to prevent ice blockage in refrigeration equipment maintenance

Ice blockage has always been a common failure of refrigeration equipment. In which part of the maintenance is it caused? The following are the correct operation methods for the 6 key links that may cause ice blocking in the maintenance of large refrigeration equipment:

03/17/2021

Several common faults in the spindle drive system of CNC machine tools and how to repair it?

When the vertical machining center supporting FANUC6 system is working, the machine tool vibrated severely, and the AC spindle drive displayed AL-04 alarm. During the vertical machining center supporting FANUC6 system is working, the machine tool vibrates severely, and the AC spindle drive displays AL-04 alarm.

06/29/2020

Suggestions for troubleshooting of compressor with liquid start

09/18/2020

Five years of sharpening the sword to rewrite the monopoly pattern of foreign brands

"After five years of development and testing, we have successfully developed an oil-free water lubricated single screw air compressor, which broke the long-term monopoly of foreign brands in one fell swoop and became another benchmark for "Creation in Shunde".

07/29/2020

R32 refrigerant training

Note: For products using R290 (such as dehumidifiers), if system failures are involved, automatic welding torch repairs are strictly prohibited. Please return the products to the factory according to the process.

07/30/2021

Where will Computer Numerical Control Machines Go?

At present, the development of Computer Numerical Control (CNC) machines with each passing day, characteristics of high-speed

08/14/2020

Characteristics and application analysis of cold storage evaporator

As one of the four major components of refrigeration, the evaporator plays a vital role in the entire refrigeration system. Therefore, the compressor and evaporator can only be matched reasonably to make the entire refrigeration system perform better.