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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.
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06/18/2020
Analysis of the circuit diagram of the two compressors' phase failure protection
Analysis of the circuit diagram of the two compressors' phase failure <br><br> Air compressor phase failure <br><br> circuit In the figure, KP is the electrical contact pressure gauge Ai is the CD4073 AND gate circuit, Az is the ~D4025 NOR gate circuit, and A3 is the CD4071 OR gate circuit. The 7806 three-terminal fixed integrated voltage regulator is used as the control circuit for the DC working power supply. When the AC power fails, the relay KA is released and the motor stops. Circuit diagram of compressor phase failure <br><br><img src="{{media url="wysiwyg/Analysis_of_the_circuit_diagram_of_the_two_compressors_phase_failure_protection.jpg"}}" alt="" />
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07/05/2020
Global Portable Oil-Free Air Compressors Market Assessment Analysis 2020-2026 | AireTex Compressors, Atlas Copco, Bauer Group, BelAire Compressors
Post dateJuly 3, 2020 HVAC Centrifugal Compressors market research report provides the details about Industry Chain structure, Market Competition, Market Size and Share, SWOT Analysis, Technology, Cost, Raw Materials, Consumer Preference, Development and Trends, Regional Forecast, Company and Profile and Product and Service.
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07/20/2023
What is a Water Source Heat Pump (with Water Source Heat Pump Diagram)
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11/03/2021
Do You Really Understand Human Machine Interface (HMI) - HMI Q&A
Q1: Is HMI only used to connect to PLC? That’s not true. HMI products are originally produced to solve the problem of PLC human-computer interaction.
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07/11/2020
Screw compressor principle and structure
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06/14/2020
Scroll compressor 2020 or will enter the dark moment
Affected by factors such as product competition and the weakening of downstream demand, in the context of the overall downturn in the HVAC industry,
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06/23/2020
How to solve if the air conditioner is not cooling
If it is not in the cooling state, we can adjust it to the cooling mode; if the dust accumulation of the air conditioner severely reduces the cooling function, we can find professional personnel to disassemble the evaporator, fan blade, and filter. Completely clean up; if it is because no refrigerant is added, then we can add refrigerant.
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10/31/2021
VFD Basics - How VFD Controls the Motor Running?
When the main circuit of the VFD is connected with the power line, in order to control the motor, it is necessary to connect the surrounding control circuit to the relevant terminals
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07/21/2023
Heat Pump vs Air Conditioner: Which One is Right for You?
When it comes to cooling your home, you have two main options: a heat pump or an air conditioner. Both of these systems work to keep your home comfortable during hot weather, but there are some key differences between the two.