CNC cutting machine
1. Gradual reduction method
The so-called step-by-step reduction method is to narrow the scope of defects step by step by elaborating the defect phenomenon and judging the measurement parameters, and begin to implement the detailed electrical or component generated by the defect. It is essentially a process of discriminating that is certain, negated, re-certained, and negated, and begins to achieve certainty (judgment).
For example, after an inverter is energized, it is found that there is no display on the operating panel. The first judgment must be that there is no DC power supply (the DC power supply voltage can be measured with a multimeter), and further investigation found that the high-voltage lamp is on (further measurement of PN voltage), denying the shortcomings of the main return high-voltage electricity, and there must be a problem with a power supply supplying power to the operation panel in the switching power supply. Measuring the AC voltage of the power supply is general, there is no DC output, and there is no short phenomenon, it can be concluded that the rectifier tube of the power supply is damaged. For example, the typical step-by-step reduction method is used. Its whole process is to go through the analysis and parameter measurement, discriminate, certain, and negate several rounds, and begin to confirm that the rectifier tube is damaged.
2. Follow the vine to touch the melon
The so-called method of following the vine is a method that follows the defect site, along the signal pass, gradually deepens, transfers the defect generation point, and finally finds the defect generation part according to the operation principle of the inverter.
For example, the output voltage of a frequency converter is unbalanced in three phases. This disadvantage is significantly framed by 2 possibilities. One possibility is that at most 1 of the 6 units in the inverter bridge is damaged (open), and the other is that at most 1 of the 6 groups of drive signals is damaged. Assuming that one inverter unit has been confirmed to have no driving signal, and the defect in the driving electricity is further confirmed, the method can be used to find it. For example, you can check from the top down, that is, from the source of the drive signal, that is, the output of the CPU.
When there is a signal in the CPU output, check whether there is a signal at the input end of the optocoupler, if there is no signal, there is a disconnection phenomenon from the CPU to the input end of the optocoupler. If there is a signal, check the optocoupler output and check whether there is a signal at the optocoupler output. If there is no signal, it means that the optocoupler is damaged. If there is a signal at the input end and no signal at the output end, it means that the defect is generated in the expansion of the current, or the expansion tube or related components are damaged. Then it's easy to implement it further.
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The basic principle of vector control – Reynolds frequency converters
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Dust design considerations for frequency converters - Reynolds frequency converters
1) The air duct of the inverter cabinet should be planned reasonably, and the exhaust should be clear and smooth, so as to avoid the formation of vortex in the cabinet and the accumulation of dust in a fixed direction.
2) The top air outlet of the inverter cabinet should be equipped with a protective top cover to avoid debris from falling directly.
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How to determine the frequency of start-up – Reynolds
Generally, most motors start to speed up from 0Hz, but in some special cases, it is necessary to start directly from a certain frequency. At this time, the frequency output of the VFD at the moment of activation is the activation frequency. In general, you need to set the activation frequency in the following situations.
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The difference between inverter motor and ordinary motor - Reynolds
1. The heat dissipation system is different: Generally, the cooling fan in the fan is in the same line as the fan movement, while the two are separated in the inverter motor. Therefore, when the frequency conversion of the fan is too low, it may burn out due to overheating.
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Centrifugal fan inverter selection method - Renol
1. See if it is energy-saving.
When selecting equipment products, many business managers will take into account the energy-saving embodiment, which is due to the excellent energy-saving embodiment of the product, which can save a lot of money and resources.
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The Reynolds booth was presented at the Industrial Automation Exhibition Center in Parma, Italy
Shanghai Reynolds Technology Co., Ltd. is an enterprise specializing in the design and production of high and low voltage soft starters, high and low voltage variable frequency speed regulation, intelligent electrical, new energy electrical and high and low voltage power transmission and transformation equipment, which are widely used in electric power, metallurgy, petroleum and petrochemical, military, mining, chemical industry, ...
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The inverter prepares the braking resistance factor – Reynolds
The preparation of the braking resistor of the inverter is mainly to consume part of the energy on the DC bus capacitor through the braking resistor to avoid the capacitor voltage being too high. Theoretically, if the capacitor stores a large amount of energy, it can be used to release it to drive the motor and avoid energy waste. However, the capacitance of the capacitor is ...
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The difference between frequency converter and power saver - Reynolds
Many people don't have a clear idea of the detailed differences and uses of AC converters and power savers. Power savers are generally divided into lighting appliances and power savers. Using high-voltage filtering and energy absorption skills, it automatically absorbs the energy of the reverse potential of high-voltage power equipment, and continuously feeds back ...
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Protection feature of overcurrent trip - Renol
1. Maintenance objectives of overcurrent
In the frequency conversion speed regulation system, there are two devices: the frequency converter and the motor. The degree of tolerance to overcurrent is not the same. The planners of the production machinery decide on the capacity of the motor based on the principle of heat. That is, as long as the electricity ...
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Reynolds inverter power selection
The system power is equal to the product of the power of a general-purpose inverter and the power of the motor. As long as both work efficiently, the system power will be higher. From the perspective of power, when choosing VFD power, you should pay attention to the following points:
VFD ...
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Precautions for Wiring Reynolds Inverters
1. The inverter itself has a strong electromagnetic disturbance, which will disturb the work of some equipment, so we can add a cable sleeve to the output cable of the inverter.
2. The control line in the inverter or control cabinet is at least 100mm away from the power cable, etc.
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The difference between "braking" and "parking" of the inverter - Reynolds
There are two types of inverter parking.
One form is called "free parking". As the name suggests, it is to quickly "power off" the motor, so that the motor can slide and park by its own inertial force (OFF2 parking);
The other form is called "brake parking". So this "brake parking ...
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Reynolds inverter code function description
F09 second acceleration time 0.10 - 999.9sec; 5.0sec； △** The acceleration and deceleration parameters and the second acceleration and deceleration parameters are switched by terminal X3 (see F55);
F10 second deceleration time 0.10 - 999.9sec; 5.0sec； △**Acceleration and deceleration parameters and the second acceleration and deceleration parameters are switched ...
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The way to set the parameters of the inverter - Reynolds
There are many setting parameters of the inverter, and each parameter has a certain range of choice, and the inverter can not work normally due to the improper setting of a single parameter in use, therefore, the relevant parameters must be set correctly.
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Method for measuring the quality of frequency converter modules – Reynolds
1. Test rectifier circuit:
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The abnormal installation of the inverter in the power frequency motor leads to hazards
Installing a variable-frequency drive (VFD) on the power frequency motor can complete the precise control and speed regulation of the motor, and improve the power and accuracy of the progressive motor. However, if it is not properly used and used, the following damages may occur:
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The object of protection of frequency converters in overload protection - Reynolds
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The inverter cannot adjust the frequency solution - Reynolds
In the course of inverter repairs, if there is no significant damage to the hardware and the maximum torque of the VFD is usually less than the torque of the load increase. It means that the load capacity of the frequency conversion speed control equipment has decreased significantly. So how do you deal with this?
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Soft-start starting method – Reynolds
1) Ramp boost soft start. This starting method is simple, does not have current closed-loop control, and only adjusts the conduction angle of the thyristor to make it add a certain function with time. The disadvantage is that because there is no current limit, in the process of motor starting, sometimes a large impulse current is generated.
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Use the right power for the inverter – Reynolds
Low pressure issues
The VFD reports a low voltage glitch when the drive's DC link voltage drops below 62% of the nominal level at the high setting (480 Vac) and 50% of the nominal value at the low setting (400 Vac).
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