1. Speed regulation of general motor: By changing the input voltage and frequency of the three-phase asynchronous motor, its speed can be controlled. Generally, when the motor is at low speed, the temperature rise becomes larger due to the decrease in the power of the cooling fan, and the motor load should be reduced according to the frequency.
2. High-speed operation: the frequency of the general power frequency power supply is 50Hz, which is fixed. The output frequency of the inverter can reach up to 650Hz. It is not possible to achieve high speed in general-purpose motors only by improving the frequency, and the mechanical strength must also be considered. When the carrier frequency of the inverter is high at high speed, the inverter must be degraded.
3. Soft start and soft stop: the acceleration and deceleration time of the inverter can be set arbitrarily between 0.1-6500.0 seconds. When running, the inverter needs to set the appropriate acceleration and deceleration time.
4. Fast and accurate start and stop: the starting current is small, and the motor heats up small. The capacity determines the acceleration and deceleration time, and the capacity level of the motor and inverter should be improved, and the proportional relationship between the acceleration and deceleration time and the load should be adjusted.
5. Forward and reverse rotation can be easily realized: the steering switch is carried out by IGBT, so the loss of the original contactor disappears, and reliable interlocking operation can be carried out. When used for lifts, a motor with a brake should be used, and there should be a mechanical insistence organization when changing the steering.
6. Electric braking: because the mechanical energy can be converted into electrical energy in the inverter when decelerating, the motor will automatically brake. DC braking is applied to the motor at zero speed, and the motor can be stopped quickly. The inverter only needs 20% of the braking force. When braking force needs to be added, an external braking unit and braking resistor are required. Inverters with built-in braking units only need an external braking resistor.
7. Motor speed regulation in harsh environments: because three-phase asynchronous motors can be used, explosion-proof motors, submersible motors or special shapes can be easily adopted. The explosion-proof motor should be matched with the inverter for explosion-proof test identification. The general-purpose inverters produced by our company are not explosion-proof.
8. One inverter can regulate the speed of multiple motors: The inverter can regulate the speed of multiple motors together. The additional current of the inverter should be greater than 1.1 times of the total current of the motor. At the same frequency, the speed will be different due to the different characteristics and loads of the asynchronous motor. Together, each motor should be heated with an overload relay to protect the motor.
9. The power supply capacity of the motor when it is started is not too large: unlike the power frequency power supply, which has a large starting current (an additional 5-6 times of the motor), the maximum maximum motor current does not exceed 100-150% when the frequency conversion is started.
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Introduction of high-power fan inverter - Delta
High power means increased cost
The use of high-power fan inverter can indeed meet the various production needs of enterprises, but high-power also means an increase in production costs. Because the more power, the more power will be consumed. Assuming that a 20KW fan inverter can ...
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Selection of braking resistors for Delta inverters
1. The necessity of braking resistance
If the regenerative energy that occurs during deceleration and descent in the application is too large, there is a possibility that the voltage of the main circuit inside the inverter will rise, causing damage.
Because usually the inverter has a built-in overvoltage maintenance function, the main circuit overvoltage (O...
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How Delta's touch screen works
Delta's touch screen consists of a contact detection component and a touch screen controller.
The contact detection component is installed in front of the display screen to detect the user's contact orientation and is sent back to the touch screen controller; And Delta's touch screen controller's ...
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DC governor overhaul method - Delta
DC governor is a kind of motor speed regulation equipment, including motor DC governor, pulse width DC governor, thyristor DC governor, etc. Generally, it is a modular DC motor governor, which integrates power supply, control and drive circuits, selects three-dimensional structure layout, and selects micro-power consumption elements for control circuits.
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The gateway is connected to the Delta inverter
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1、Mo ...
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The inverter reported the cause of the grounding fault - Delta
Regarding the grounding problem, it can generally be swept away after the following steps (because most of the inverters are not easy to detect the current measurement of Hall components, it is very important to sweep the grounding caused by external conditions, and alternative methods can be selected if there are conditions, and it is still an external problem to change a normal load to see whether it is a problem of frequency conversion or an external problem ...
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Rated current design of inverter leakage circuit breaker - Delta
1. Install AC reactor and DC reactor. When the capacity of the inverter is greater than 500kva in the distribution transformer, and the transformer capacity is more than 10 times the capacity of the inverter, an AC reactor is installed on the input side of the inverter. And when the output voltage of the distribution transformer is unbalanced and uneven in three phases ...
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Delta's inverter energy-saving method
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Power Factor Supplement ...
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Delta's touch screen downloads programs and communication settings
1. Touch screen download program
(1) Device software DOPSoft;
(2) The communication line uses a square port data line;
(3) device drive;
(4) Configuration screen;
(5) In the Stuff, select Download All Materials.
2. Communication settings
(1) Touch screen settings
...
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Consider the timing of increasing the capacity of the inverter - Delta inverter
1. The rated current of the inverter is low
As mentioned above, when the rated current of some inverters is less than the rated current of the motor of the same capacity, the inverter with a larger gear should be considered according to the load condition of the motor.
2. The motor may be overloaded for a short time
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Precautions for inverter selection - Delta
The selection of the inverter is mainly determined by the load characteristics of the drive and the actual working current of the motor, in addition to the following precautions:
1. The environment is suitable for some high temperature (higher than 50 degrees) and high altitude (higher than 1000 meters).
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The inverter has a built-in PLC function - Delta
PLC progressive scanning standard work preparation.
Abundant programming language: instruction statements; ladder diagram; SFC。
Abundant instruction statements: 45 instruction varieties, including 28 root instructions and 17 usage instructions.
350 step law capacity.
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Delta's inverter is powered on and commissioned
After the installation of the Delta inverter is completed, disconnect the output of the inverter, use the diode file of the digital meter to measure the input and output of the inverter before the power is not turned on to ensure that there is no short circuit, and then turn on the operating power supply of the inverter.
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The basic control loop of Delta's inverter
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