Hitachi Relay NFM25A4
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06/20/2020
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.
06/14/2020
The newly purchased cooked food cabinets are very beautiful both inside and out, but they are pleasing to the eye. However, after a period of use, we will find that the cooked food refrigerator not only does not look as beautiful as it was just bought, bu ﰸ2 䀀 ᅵ皥 䖒皦즠Ʋ娼ི 㲈Ʋ 䌁皦隆 ᮔDž༬皧婆ིЀ 呄ᠾ鹨់༹皧 ࠄ 00븹먱댁珵理뛐珵Љ 䕄ྦ 뤂ᐱ變뚜珵 ᴴᏩ呄ᠾ퍘ᒥ 鹨់變ᩄ ꋔྦ 瑉浥 巠皱㙲皦抐皱 巠皱 ੨皦柘皱 ᅵ皥 ب 巠皱㙲皦忈皱 ੨皦柘皱 즠Ʋǜ 勁皦즠Ʋب ǜ V / 펔B䌁皦 ᮔDž '鱤džቜ먢䇨珵呈ᠾ뤂ᐱ ⬿먲僧ᐱ靖㥲ᐲ�僬㣢ᐲ ᠾ 靖랖
09/10/2020
1. High efficiency The high efficiency mentioned here does not only mean that the efficiency of the rated power point is higher than that of the ordinary three-phase asynchronous frequency modulation motor, but refers to its average efficiency in the entire speed range. The excitation field of the permanent magnet synchronous motor is provided by the permanent magnet.
01/07/2021
The advantages and disadvantages of screw refrigeration compressor Compared with piston refrigeration compressors, screw refrigeration compressors have obvious advantages and disadvantages.
09/07/2020
The gas storage tank is a part of the post-processing equipment of the air compressor, which mainly plays the role of gas storage, buffering, pressure reduction, and drainage. It will inevitably cause corrosion in the air, rain or humid atmosphere after long-term use or use for many years.
11/04/2022
The thermostatic expansion valve (TXV or TEV), also called the thermal expansion valve, controls the openness degree through the control of the superheat of the gaseous refrigerant at the outlet of the evaporator.
04/30/2022
Contactor is the most basic and common electrical component in relay control system. It is mainly used to connect and disconnect lines, or frequently control the operation of motors and other equipment.
07/11/2020
Working principle structure diagram of screw air compressor 1. The basic structure and working principle of screw air compressor The commonly known screw compressor refers to the twin screw compressor. The basic mechanism of screw compressor: In the body of the compressor, a pair of intermeshing spiral rotors are arranged in parallel.
06/14/2020
Copeland compressors in the United States (notes) Heat pump type-excess liquid return test
07/03/2020
According to a new report published by Eon Market Research, titled, ”Global Refrigerant Compressor Market by Product Type and End-Users/Application Global Market Share, Forecast Data, In-Depth Analysis, and Detailed Overview, and Forecast, 2020 – 2025″ – By Regions (USA, Europe, Japan, China, India, South East Asia).