HITACHI VFD Frequency Converter HFC-VAH-6LF3
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Input: 50/60Hz 200-240V 3PH
Output: 0-5000HZ 200-240V 3PH
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03/02/2021
1)At high speed, the speed is proportional to the voltage 2) At low speed, the voltage is lower than the decrease of speed;
08/19/2020
Condenser and evaporator are heat exchangers, which are widely used in refrigeration systems of high and low temperature alternating damp heat test chambers, constant temperature and humidity test chambers and other equipment.
08/17/2020
If the cooling performance of water-cooled chillers is to be kept in a stable state, very strict requirements on the water source are required. In the daily use of chillers, if the company does not pay enough attention to the quality of the water source
05/09/2022
What is the fault code E57 displayed during the use of Mitsubishi Heavy Industries' Haier air conditioner General failure Mitsubishi Heavy Industries Haier Air Conditioner is a central air conditioner produced by a large electric appliance group Haier 器2 䀀 ᅵ皥 䖒皦즠Ʋ奌ི 㲈Ʋ 䌁皦 ᮔDž༬皧奖ིЀ 呄ᠾ鹨់༹皧 ࠄ 00령ꐱ댁珵뛐珵Љ 䕄ྦ 뤂ᐱ뚜珵 ᴴᏩ呄ᠾ퍘ᒥ 鹨់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džၜ먢䇨珵呈ᠾ뤂ᐱ ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲ ᠾ 랖僧پ 識 �僬㣢ᐲ 臆S㥲ᐲ ᬄğ 識 理艏S杴 識杴 㥲ᐲ
08/15/2020
After the construction of the cold storage project, there may be many problems. For example, we have seen a lot of news recently. It is said that the wall cracks appeared after the construction of the cold storage
06/13/2020
The principle of auxiliary equipment of air conditioning and refrigeration system (1) In air conditioning and refrigeration, in order to enable the reliable and stable operation of the refrigeration system and improve the economics of operation
07/27/2020
1. Refrigeration cycle and pressure enthalpy diagram<br></br> The refrigeration cycle of a screw chiller can be represented by a pressure-enthalpy diagram. The main state points are shown in the diagram, which will be used in the following discussion.
08/09/2023
A heat pump is a popular heating and cooling system that works by transferring heat from one place to another. It can heat your home in the winter and cool it in the summer, making it a versatile and cost-effective option for many homeowners.
07/15/2020
What the editor will introduce today is the Emerson Copeland compressor ZP72KCE-TFD/5/7, which is suitable for R410A refrigerant at 60Hz three-phase electric air conditioning. The power given in the manual of Emerson Copeland Scroll Air Conditioner Compressor is 6.0 hp. Other technical parameters can be downloaded from our company's website for inquiries.
06/19/2020
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.