The correct choice of Delixi inverter is very critical to the normal operation of the control system. When selecting a frequency converter, it is necessary to fully understand the load characteristics driven by the frequency converter. In practice, people often divide production machinery into three types: constant torque load, constant power load and fan and pump load.
Constant torque load
The load torque TL is independent of the speed n, and the TL always insists on stability or base stability at any speed. For example, conflict loads such as conveyor belts, mixers, extruders, and potential energy loads such as cranes and hoists are all constant torque loads. When the inverter drags a load of constant torque nature, the torque at low speed should be satisfactory and there is a satisfactory overload capacity. Assuming that it needs to work at a steady speed at low speed, the heat dissipation capacity of the standard asynchronous motor should be considered to prevent the temperature rise of the motor from being too high.
Constant power load
The torque required by the spindle of the machine tool and the coiler and uncoiler in the rolling mill, paper machine, plastic film production line, etc., is roughly inversely proportional to the speed, which is the so-called constant power load. The constant power nature of the load should be in terms of the magnitude of the velocity change that must be. When the speed is very low, due to the limitation of mechanical strength, TL may not increase indefinitely and change to constant torque properties at low speeds. The constant power zone and constant torque zone of the load have a great influence on the choice of transmission plan. When the motor is regulated by constant flux, the output torque remains unchanged, which belongs to constant torque regulation; In the case of weak magnetic speed regulation, the output torque is inversely proportional to the speed, which belongs to constant power speed regulation. Assuming that the scale of constant torque and constant power speed regulation of the motor is consistent with the constant torque and constant power scale of the load, that is, in the case of the so-called "matching", the capacity of the motor and the capacity of the inverter are small.
Square torque load
In various fans, water pumps, and oil pumps, the resistance generated by air or liquid within a certain speed scale is roughly proportional to the second power of velocity n as the impeller rolls. With the decrease of the speed, the torque decreases by the 2nd power of the speed. The power required for such a load is proportional to the 3rd power of speed. When the required air volume and flow rate are reduced, the inverter can be used to adjust the air volume and flow rate through speed regulation, which can greatly save electric energy. Because the required power increases too quickly with the speed at high speed, which is proportional to the cubic of the speed, it is generally not necessary to make the fan and pump load work beyond the power frequency.
When selecting the inverter, you should refer to the load characteristics, and the actual motor current value should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. In addition, it should be fully considered that the output of the inverter contains abundant high-order harmonics, which will make the power factor and efficiency of the motor deteriorate. Therefore, the power supply to the motor with the inverter is more than the power supply to the power grid with the industrial frequency, and the current of the motor will increase by 10% and the temperature rise will increase by about 20%. Therefore, when selecting motors and inverters, this situation should be taken into account and a margin should be left appropriately to prevent the temperature rise from being too high and affecting the service life of the motor.
|
More on that
|
Delixi launched a new 6 series CDW6i frame circuit breaker
At the end of July, Delixi Electric launched a new 6 series CDW6i structural circuit breaker and a number of industrial control accessories.
The new 6 series CDW6i structural circuit breaker has complete product specifications, which can provide professional customers with more choices, excellent functions, and ...
|
|
Characteristics and parameters of industrial molded case circuit breaker - Delixi
1. Extra limit short-circuit breaking can be used for Icu
There are two types of breaking capacity targets for circuit breakers: additional limit short-circuit breaking capacity of 4U and additional operating short-circuit breaking capacity Ics. As a characteristic parameter, ICS is not only a brief consideration of the breaking ability of the circuit breaker, but also a breaking purpose.
|
|
Delixi selects the advantages of the inverter
1. Significant energy-saving effect: up to 20%-45%
2. Optimize electrical equipment: when the motor starts, there is no large current impact, which reduces the load of the transformer
3. Convenient operation: the speed of the motor is directly given according to the size of the air volume, and the accuracy of the air volume is adjusted accurately
...
|
|
Delixi inverter analog output fault analysis
The analog output of Delixi inverter is abnormal, and the operating frequency of the inverter does not match the output of the controller?
Solution(s):
First, you should determine what hardware is going wrong. Make the controller enter the manual debugging situation, respectively...
|
|
The reason why the switch socket is hot - Delixi
1. The socket quality is low quality
First of all, we should check whether the socket is a miscellaneous and inferior product, the copper clamping force in the defective socket is not good, resulting in poor contact between the socket and the plug, and the socket and plug will heat up after a long time of electrical use. So be sure not to buy cheap miscellaneous ...
|
|
Transformer abnormal power-off treatment fault method - Delixi
First of all, when the transformer is faulty, we must cut off the power supply of the transformer through abnormal methods for the first time, and many major electrical fires and electric shocks are caused by the main gate is not closed. Now let's take a look at what to do.
...
|
|
General parameter setting skills of inverter - Delixi
The setting menu of the inverter is divided into a first-level menu, a second-level menu, etc., and the menu is followed by parameters.
If the inverter starts in standby (ready to run) condition, set the FUn-PSS-SP2 parameter to 15Hz, and then return to the standby state operation.
In the practice setting ...
|
|
Delixi inverter CDI-E180 series of introduction
Product Introduction
With optimized open-loop vector control, V/F control, closed-loop vector control, stable function, rich functions, it is a high-performance vector inverter, which can be widely used in speed control accuracy, torque echoing speed, ...
|
|
Delixi voltage regulator fault phenomenon and analysis
Delixi regulator output voltmeter keeps swinging back and forth, and sparks occur at the carbon brush, and the problem phenomenon and cause analysis
1. The contact pressure between the carbon brush and the coil plane is too small
2. The carbon brush is severely worn
Delixi voltage regulator has ...
|
|
Delixi relay maintenance method
Relay is a kind of electrical appliance that turns on or off the control circuit according to the change of external input signals, such as electrical quantity (voltage, current) or non-electrical quantity (heat, time, speed, etc.), in order to complete the control or maintenance mission.
|
|
Delixi voltage regulator safety precautions
1. When the stabilized power supply is powered on, please do not disassemble the stabilized power supply or pull the input and output cables of the stabilized power supply at will to prevent electric shock or other electrical safety accidents.
2. The input and output connections of the regulated power supply must be reasonably arranged, ...
|
|
Delixi occasion to choose the inverter
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct selection of the type of inverter.
When selecting the inverter, the current value of the actual motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, the output of the inverter should be fully considered ...
|
|
Delixi inverter parameter setting method
P0.00: Set to G type (constant torque load type).
P0.01: Set to 1 fundamental efficacy model.
P0.02: Set to 1V/F control.
P0.03: Set to 0 keyboard control.
P0.04: Set to be given by the external terminal for multi-segment commands.
...
|
|
Delixi Electric plastic case leakage protector purchase precautions
There are many kinds of manufacturers and brands of electrical equipment and sales of electrical equipment on the market, we must choose the authentic brand of Delixi Electric when buying, and we must buy from regular dealers to avoid buying fakes. Everyone calls the electric tiger because electricity will form poles when it is not used properly.
|
|
Introduction to the closed-loop control system of stepper motor
1. The closed-loop control of the stepper motor was first in the form of encoder
For stepper motors with low split ratio, a slotted disc and photoelectric sensor are usually used as a reaction encoder assembly, and the number of notches is equal to the number of steps taken by the motor per revolution, · About high resolution ...
|
|
What are the advantages of Delixi inverter
(1) Optimize electrical equipment: when the motor is started, there is no large current impact, and the load of the transformer is reduced.
(2) The energy-saving effect is obvious: it can reach 20%-45%.
(3) Extend the life of the whole machine: it has the function of soft start, reducing the load ...
|
|
CDQ1F series PC-level excitation automatic transfer switch - Delixi
Delixi Electric's newly launched CDQ1F series PC-level excitation active transfer switch, with more complete specifications and stronger functions, the power-off time can be shortened to less than 0.1s, escorting the continuous use of electricity in important places!
CDQ1F Active ...
|
|
Delixi voltage regulator safety installation method
In people's lives, voltage regulators are not short, but some people do not install voltage regulators correctly, which leads to great safety hazards in the use of voltage regulators. Here's how to properly install the regulator:
...
|
|
Delixi low-voltage inverter selection method
The selection of inverter is indeed very important, because if the selection is not suitable, it will cause a waste of time and money, and at worst it will cause production incidents and personnel damage.
First of all, according to the classification and selection of the inverter
1. Inverters can be divided into general-purpose inverters and special inverters.
...
|
|
Advantages of Delixi parameter voltage regulator
1. Its overall induction skills are the best, its design does not use electronic devices, and the environmental adaptability and stability are the highest. When the capacity of most power grids is sufficient, the voltage is relatively stable, but with the improvement of electrification and informatization, the pollution of some power grids, ...
|
|
Contact
working hours
