a. Output frequency scale. The output frequency scale that can be controlled by the general inverter, the lowest starting frequency is generally 0.1Hz, and the highest frequency varies according to the functional indicators of the inverter, generally 400Hz, and some models are 650Hz. No matter how high the output frequency is, it depends on the scale of the high-frequency inverter.
b. Set the frequency resolution. Frequency resolution is the minimum frequency value that can be resolved. In the digital general-purpose inverter, if the frequency is set by the external analog signal 0-10V or 4-20mA, the resolution is determined by the internal A/D converter; If it is set with a digital signal, the resolution is determined by the number of digits of the input signal. The resolution can reach 1/3000 for imitation setting, and 0.01Hz for panel operation. Some inverters also have functions such as bias adjustment, gain adjustment, and upper and lower limit adjustment for external signals. For occasions that require high control accuracy, it can also be treated with optional parts. Some inverters can choose digital (BCD code, binary code) input and RS-232C/RS-485 serial communication signal input module.
c. Output frequency accuracy. Output frequency accuracy is the degree to which the output frequency varies depending on the operating conditions. Output Frequency Accuracy = Frequency Change Value / Maximum Frequency × 100%, generally this change is caused by temperature changes or drift. When the setting is imitated, the output frequency accuracy is less than ±0.2%; When the digital setting is set, the output frequency accuracy is ±0.01% or less.
(3) U/f characteristics of the inverter. The U/f characteristic is the ratio of the output voltage to the frequency of a general-purpose inverter within a frequency-variable scale. The general inverter can set the output voltage at the basic frequency and the highest frequency respectively, and generally give the voltage scale, such as 400V level input, 160-480V.
(4) The torque characteristics of the inverter. When the motor is driven by an inverter, the temperature rise is slightly higher than when using a power frequency power supply. In addition, when running at low speeds, the cooling effect of the motor decreases, and the promised output torque decreases accordingly. The torque characteristics of the inverter generally include the following.
a. Starting torque: corresponding to the maximum output torque at 0Hz, the percentage of the maximum output torque at 0.5Hz is generally given, such as 0.5Hz, 200%.
b. Torque increase. In order to start the motor smoothly, the under-excitation of the motor should be compensated, so that the reduced torque during low-frequency operation is enhanced, and the torque improvement function is generally settable or self-tuning.
c. Torque constraint. For example, when the torque of the motor reaches the set value, the torque restraint function will actively adjust the output frequency to avoid overcurrent tripping of the inverter. The torque restraint function is generally programmable and can be selected by the contact input signal.
(5) PID control of inverter. Generally, the type and setting value of the control signal and response signal of the PID control function are clarified in the product description, such as keyboard panel setting, voltage input DC 0-+10V, current input DC 4-20mA, multi-stage speed setting, serial communication interface link setting: RS-485, set frequency/maximum frequency × 100%, reaction signal 0-10V, 4-20 mA or 20-4mA, etc.
(6) The speed regulation ratio of the inverter. The speed ratio is the ratio of the upper frequency (e.g., 50 Hz) to the lowest operating frequency that can be reached (e.g., 0.5 Hz). The nominal value corresponding to the lowest frequency, such as torque function, temperature and speed accuracy, speed response, etc., should be able to meet the operation requirements. If the minimum frequency is 0.5Hz and the upper frequency is 50Hz, the speed regulation ratio is 100:1. The speed control ratio indirectly expresses the low-frequency function and speed control accuracy of the general-purpose inverter.
(7) The braking mode of the inverter. When the motor is operated with a universal inverter, electric braking is possible. The electrical braking of the general inverter is divided into internal braking and external braking, the internal braking generally has AC braking and DC braking, and the external braking has braking resistance braking and power feedback braking.
|
More on that
|
The difference between vector and general use of inverter - Schneider
1. The control accuracy of the vector type is higher than that of the general-purpose type.
2. The vector type has a large output torque at low speed, which can make the motor get a larger starting torque, which is suitable for application in the occasion of heavy load starting, such as: high-power long belt, hoist, etc. If used in some of the more common fields ...
|
|
Is there a restriction on the installation direction when Schneider installs the inverter?
It should be basically stored in the plate, the problem is that the plate with a fully enclosed structure is large, takes up a lot of space, and the cost is relatively high. This can be done by:
(1) The planning of the disc should be based on the heat dissipation required by the actual device;
(2) Profit ...
|
|
Schneider instrumentation winter insulation measures
The methods adopted usually are: selection, thermal insulation and heat tracing, protection (point inspection, sewage discharge) and so on.
Selection method
Choose the appearance of the type with insulation equipment. According to the category and use of the appearance and the geographical location of the proposed equipment, the insulation and antifreeze requirements of the appearance are proposed, and then submitted to the manufacturer for processing. ...
|
|
Schneider ATV32 inverter malfunction
1. The ATV32 inverter reports that the bLF is a brake control fault.
Possible causes: 1. The brake release current is not reached. 2. When the braking logic control is assigned, only the closing frequency threshold [brake closure frequency] (bEn) is adjusted.
Repair measures: 1. Check the inverter/electric ...
|
|
Schneider seizes the opportunity of e-commerce
Beijing, China, 24 August 2021 – Looking at the history of the logistics industry, the changes brought about by the development of e-commerce in recent years are rare. According to Digital Commerce 360, in 2020, United States customers spent $861.12 billion online, a year-on-year increase.
|
|
Schneider TRSS telemetry system solution
Schneider Electric provides safe, reliable, end-to-end telemetry solutions to help you meet the challenges of long-distance operations. With an outstanding reputation in the fields of appearance, manipulation and data collection, wireless communications, IT, and other industries and common sense, Schneider Electric telemetry system solutions can help ...
|
|
Advantages and disadvantages of closed busbars compared with open busbars - Schneider
The advantages of closed busbars over open busbars are:
1) Closing the bus duct can reduce the grounding fault, avoid the short circuit between phases, basically eliminate the grounding defect caused by external moisture, dust and foreign objects, and improve the continuity of generator operation.
2) Eliminate ...
|
|
How can industry be high-quality and sustainable? - Schneider
Sanya, China, October 21, 2021 – In the context of the ever-changing global development situation and the increasingly urgent response to carbon neutrality, Ruan is moving towards carbon neutrality together with cost reduction and efficiency increase, which has become the focus of attention of many industrial enterprises. As a global digital transformation specialist in power management and automation...
|
|
Where the inverter filter is suitable - Schneider
1. LC filter
LC filter is suitable for occasions with low requirements for harmonic content, and a good LC filter can control the distortion rate at 8-10%;
2. Harmonic filter
This filter is suitable for harmonic ...
|
|
Schneider ATV71 selection and letter meaning
The type of Schneider inverter generally reflects the rated voltage, rated power, and load requirements of the inverter (heavy or light load).
Here are two examples:
Example 1:
Schneider Inverter Type: ATV71HD11N ...
|
|
Schneider servo drive fault code
1. AL001: overcurrent, the current value of the main 2113 circuit exceeds the motor instantaneous 5261*** high current value 1.5 times when the action is 4102.
2. AL002: overvoltage, the voltage value of the main return 1653 channel is higher than the standard value.
3. AL003: low voltage, the voltage value of the main circuit is lower than the standard.
|
|
Schneider ATV71 inverter installation and modulation setting steps
1. Schneider inverter menu:
(1) Simple start:
Self-tuning: If the manifestation is "unfinished", then select "supplication self-tuning" until the manifestation is "finished", i.e., the completion of self-tuning;
Acceleration moment: a ...
|
|
Motor control mode of Schneider inverter
Fundamentals of magnetic flux vector manipulation
The control of a three-phase asynchronous motor is much more complicated than that of a DC motor because the current, voltage, induced potential, magnetic flux, etc., of the stator and rotor are all alternating.
However, the stator winding of the three-phase asynchronous motor is a symmetrical three-phase winding, which exerts a ...
|
|
Line leakage detection method - Schneider
Line leakage detection method, leakage check method summary, if a closing, leakage switch will trip, this kind of front leakage, check the method is as follows:
1. Disconnect all the separation gates, close the main gate, close the separation gates one by one, and close them to ...
|
|
Advantages of Schneider molded case circuit breaker
The contact orientation is 100% secure
As for the circuit breaker, the indication of the handle can also be said to be the fault indicator of the circuit breaker, if it is "blurred" for a while, it may cause irreparable damage. Therefore, according to the requirements of the national standard, in any case, the hand of the circuit breaker ...
|
|
Schneider servo motor advantages
Schneider servo motor is one of the brands of servo motor, the performance is relatively good, is a brand made in Germany, in China ** degree is relatively high. Servo motor refers to the servo system, (servomechanism) in which the mechanical components are controlled.
|
|
Common faults and judgments of Schneider inverters and controllers
Reducing power consumption is also a key point reflected, because Taiwan imports power proportion of 99%, improve power efficiency, comprehensive development of power transformation is the absolute direction, in the future Schneider each new product will also buckle the two major tones of energy saving and intelligence, in the words quite Schneider to from the power expert identity ...
|
|
Schneider instruments measure error factors
When measuring, because various elements will constitute a small number of errors, these elements need to be understood and effectively solved, so that the errors in the whole measurement process can be reduced to the smallest. When measuring, the main errors that constitute errors are system errors and random errors, and system errors have the following conditions: misreading, ...
|
|
Detailed explanation of the steps of Schneider inverter inverter setup
1. Macro equipment:
In view of the control requirements of different loads, Schneider inverters have talked about the macro equipment in advance and the initial function of the I/O terminals.
Changes to the macro rig can be corrected under the Abbreviated Boot Menu.
If required, it is also possible to re-equip the end separately ...
|
|
Schneider ATV series inverter used as inverter power supply?
Can Schneider ATV series inverter be used as a variable frequency power supply?
No, you can't. The inverter is a control device designed according to the characteristics of the communication asynchronous motor, and cannot be used as a variable frequency power supply.
The entire circuit of the variable frequency power supply is composed of a ditch ...
|
|
Contact
working hours
