Principle analysis is the most fundamental way to eliminate the problem, when other methods are difficult to see the effect, you can start from the basic principle of the circuit, step by step to view, and finally find out the cause of the problem. It is necessary to have a clear understanding of the principle of the circuit to use this method, grasp the logic level and characteristic parameters (such as voltage value and waveform) at each time and point, and then measure it with a multimeter and oscilloscope, and compare it with the normal situation, analyze and judge the cause of the problem, reduce the scale of the problem, and find the problem.
For example, an inverter sent for repair loses the signal of the charging resistor, short-circuit relay, fan operation, and inverter condition relay at the same time. Through comparative experiments, it was confirmed that the problem was on the control board. Through analysis, the problem may be with the latch, since these signals are controlled by this chip. Replacement Result Fix.
In general, the viewing of the hair defect frequency device should be from the outside to the inside, from the outside to the inside, from static to dynamic, and from the main circuit to the control circuit. The following three reviews are generally necessary.
Use a multimeter to check the diode characteristics and three-phase balance characteristics of the output terminals for the DC positive and negative electrodes, respectively. This step can start to determine whether the inverter module is good or bad, and then decide whether it can be output without load. If there is a phase-to-phase short circuit or unbalanced condition, it is not possible to output without load.
If no problem is found in the above two steps, you can open the casing, remove dust, carefully investigate whether there is damage inside the inverter, whether there are blackened parts, whether the capacitor is leaking, etc.
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Maintenance and maintenance method of electric motor - LS generates electricity
1. Look: The normal operation of the motor has a great relationship with the surrounding environment. Therefore, during the daily inspection, check the water leakage and dripping conditions around the motor (which will cause the low insulation of the motor to form a breakdown and cause burnout), and check whether the peripheral of the motor affects its ventilation and heat dissipation ring.
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Practical common sense in the inverter industry - LS inverter
1. The low-voltage fuse cannot be used as an overload maintenance of the motor.
2. The additional voltage of the fuse must be greater than or equal to the operating voltage of the distribution line.
3. The additional current of the fuse must be greater than or equal to the ...
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Explanation of basic terms of electrician - electricity production
1. Active power - in the process of generating and transmitting alternating current energy, the part of energy used to convert into electromagnetic methods is called active power
2. Reactive power - in the process of AC electric energy generation and transmission, it is used for electromagnetic field AC in the circuit.
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LS automatic gain adjustment for power generation
In fact, there are also options for automatic gain adjustment, which generally divide the control response into several levels, such as high echo, medium echo, and low echo, which can be set by the user according to actual needs.
Azimuth Share Buff:
1. Set the share gain of the azimuth ring adjuster;
2 ...
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The selection principle of AC contactors - LS produces electricity
1. The voltage level of the AC contactor should be the same as the load, and the type of contactor should be suitable for the load.
2. The accounting current of the load should be less than or equal to the additional working current of the contactor.
The turn-on current of the contactor is greater than the starting current of the load, and the breaking current is greater than the load ...
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Precautions for the coordination of inverter and PLC - LS produces electricity
As an alternative to traditional relays, PLC is widely used in various fields of industrial control. Because the PLC can be used to change the control process with software, and has the characteristics of small size, sensitive assembly, simple programming, strong anti-disturbance ability and high reliability, it is especially suitable for operation in harsh environments. ...
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Advantages of universal inverter - LS produces electricity
Universal inverters are characterized by their versatility. With the development of inverter technology and the continuous expansion of market demand, general-purpose inverters are also developing in two directions: low-cost simple general-purpose LS inverters and high-performance and multi-functional general-purpose inverters. They have the following characteristics:
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LS inverter frequency conversion mode
1. The operator panel is given The operator panel is a simple frequency setting method of the inverter, and the user can directly change the set rate of the inverter through the potentiometer, digital key or rising and descending keys on the inverter operator panel. The big advantage of the operator panel is that it is simple ...
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What is the difference between LS inverter and LG inverter?
LS inverter and LG inverter are the same, there is no difference between the two.
LS inverter, the full name of LS AC inverter governor, after supplying a variety of configurations, converts direct current into communication power, and changes the general power supply ...
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Models and features of LS Metasol series products
Metasol series MS (100A and below) products are newly launched and the primary product specifications: contactors, thermal relays, and center relays.
Features:
The body is small, the internal structure is sealed, and the safety factor is high
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Requirements for the use of starting inverter motors - LS power generation
Frequency conversion motor refers to the motor that runs continuously with 100% rated load in the range of 10%-100% rated speed under standardized environmental conditions, and the temperature rise will not exceed the allowable value of motor calibration.
Communication contactors are not necessary for frequency converters and are built in, ...
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A brief description of the K120S series plc
K120S series PLC product is a unit PLC product introduced to the market by LS in 2004, which has laid a solid foundation in the low-end small machinery supporting industry with its high-performance price ratio. Relying on some special functions of the product, it has also won some industry praise.
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Precautions for powering on the inverter after the LS power production holiday
1. During the holiday, low temperature can easily cause the equipment to be damp, check whether the electrical equipment is dry, whether there is moisture and condensation;
2. Check whether the grounding wire is loose and whether the cable is damaged by rodents and insects;
3. Sort out the dust and oil stains, and inverter ...
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Faulty failure with soft starter - LS generates electricity
In the use of soft starters, some users often have some wrong concepts:
1. It is believed that whether the motor can be started successfully is related to the function of the soft starter, and a good brand or even a foreign brand should be selected under heavy load.
2. When the motor is not ...
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Analysis of the fault problem of LS power terminal block
From the point of view of application, the function of the terminal block should be achieved: it is necessary to conduct the local conduction of the touch part, and the touch is reliable. The insulating part should not be conducted, and it is necessary to insulate it firmly. There are three common forms of fatal problems in terminal blocks:
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How LS PLC works
Although many names such as relays, timers and counters are often used in the ladder diagram programs used by LS PLC, LS PLC does not have these hardware physically, but uses memory and program programming to do logic control and editing, and connects to external machines through output components.
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Inverter life extension method - LS power generation
1. The inverter should not be installed on the equipment with a sensation, because the main circuit connection screw in the inverter is easy to loosen, and many inverters are damaged due to this reason.
2. Wiring problem: the input terminal of the inverter should be connected to a ...
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The meaning of servo in LS power production
"Servo" - the word derives from the Greece word for "slave". People want to treat the "servo mechanism" as a handy tame thing, and act in accordance with the requirements of the control signal. The rotor stands still until the signal comes; As soon as the signal arrives, the rotor rolls; When the signal disappears, the rotor can instantly ...
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The difference between voltage type and current type inverter - LS generates electricity
The differences between voltage type and current type inverter are mainly manifested in:
(1) the load of the buffer inverter of reactive power is an asynchronous motor, which is an inductive load, and in addition to transmitting active power between the intermediate DC link and the motor, there is also the exchange of reactive power. Because power electronic switches ...
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LS produces common sense of electroplastic case circuit breaker
(1) Tripping
LS electric molded case circuit breaker basically involves the tripping unit in the process of practical application, and the tripping is generally a tripping method of thermomagnetic tripping or electronic tripping.
In the process of practical application, if it is a ...
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