1. Select the inverter according to the load characteristics, such as the load is constant torque load, you can choose Siemens MM440 inverter, ABB ACS800 series inverter, etc.; If the load is a fan or pump load, you can choose Siemens MM430 inverter, ABB ACS510 series inverter, etc.
2. When selecting the inverter, the actual motor current value should be used as the basis for the selection of the inverter, and the additional power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will cause the power factor and power of the motor to deteriorate.
3. When the inverter wants to run with a long cable, the inverter should be enlarged by one gear or the output reactor should be installed at the output end of the inverter.
4. When the inverter is used to control several motors connected in parallel, it must be considered that the sum of the length of the cable from the inverter to the motor is within the allowable range of the inverter.
5. For some special application occasions, such as high ambient temperature, high switching frequency, high altitude, etc., it will cause the reduction of the inverter, and the inverter needs to be expanded by one gear.
6. When selecting the inverter for high-speed motors, it should be slightly larger than the inverter of ordinary motors.
7. When the inverter is used in a pole changing motor, full attention should be paid to the capacity of the inverter, so that the maximum additional current is below the additional output current of the inverter.
8. When driving the explosion-proof motor, the inverter does not have an explosion-proof structure, and the inverter should be set outside the risk place.
9. When the frequency converter is used to drive the gear reducer motor, the application range is restricted by the smooth method of the gear rotation part. Do not exceed *** high speed tolerance.
10. When the inverter drives the wound rotor asynchronous motor, most of the existing motors are used. It is easy to overcurrent tripping due to ripple current, so it is necessary to choose an inverter with a slightly larger capacity than usual.
11. When the inverter drives the synchronous motor, the output capacity is reduced by 10%-20% compared with the power frequency power supply.
12. Regarding the load with large torque fluctuations such as compressors and vibrating machines and the peak load conditions of hydraulic pumps, the power frequency operation status should be understood, and the inverter with additional output current greater than its maximum current should be selected.
13. When the inverter controls the roots blower, due to its large starting current, it is necessary to pay attention to whether the capacity of the inverter is large enough when selecting the inverter.
14. When selecting the inverter, it is necessary to pay attention to whether its protection level matches the situation on site.
15. Single-phase motors are not suitable for inverter drive. If there is only the high reliability of the inverter body, and the inverter selection and capacity matching is not appropriate, the frequency conversion speed regulation system composed of it cannot achieve high reliability, or even unable to operate, so how to ensure the normal and efficient operation of the frequency conversion adjustment system? We want to make sure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct type of inverter is selected.
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Hope Sunland inverter application introduction
1. Motor control
The inverter is mainly used in the field of motor control, which can complete the speed control, torque control, and azimuth control of the motor. The inverter can adjust the speed and load of the motor according to the process requirements, which can improve the output power and quality.
2. Air conditioning refrigeration
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The servo motor is connected to the wrong wire and causes a problem - Senlan
If the three power cables of the servo motor (SM) are not connected correctly, there may be no alarm in the static state. But as soon as the motor is operated manually or actively, the motor jumps off or starts to flutter, such as jumping when the speed is added too high, the system will issue generalized faults, etc.
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Introduction to the speed regulation mode of inverter motor - Senlan
1. Mechanical speed regulation form
There are three methods of mechanical speed regulation: electromagnetic clutch, hydraulic coupling, and viscous clutch. Among them, the hydraulic coupling device is widely used, that is, a hydraulic coupling device is connected in series between the motor and the load, and the concave and convex liquid level is used to adjust the hydraulic coupling between the motor and the load.
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Hope Sunland grid-connected PV inverter
Grid-connected photovoltaic inverter is one of the core components of solar photovoltaic power generation system, the main types are: central inverter, modular inverter, micro inverter, DC ...
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Sunland inverter does not show fault repair
After inspection, the circuit board of the machine is composed of a fan switching power supply board, a control board with a switching power supply and a driving board, etc., the fan power supply and the control board operation power supply are independent of each other, the fan power supply output is normal, and the control board operation power supply is not output due to the problem.
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Inverter load type - Sunland inverter
(1). Constant torque load
Different speeds, load resistance and torque base are stable. The output power is directly proportional to the rotational speed. Such as belt conveyors.
(2). Constant power load
Different speeds, stable load power base ...
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The eight forbidden areas of inverter control loop wiring - Senlan
1. The wires of the inverter control circuit should be strictly distinguished from the main circuit cable (power line) and placed separately. This will help prevent the inverter's control circuit from being disturbed by harmonics in the inverter's main circuit.
2. To separate the connection of the inverter from the terminals or contacts of other control circuits, ...
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Misunderstandings and solutions to the disadvantages of inverter application - Sunland inverter
Myth: The inverter selection only needs to consider the load power
When purchasing a frequency converter, many users usually only match the capacity of the frequency converter based on the power of the drive motor. In fact, the load driven by the motor is different, and the requirements for the inverter are also different.
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Hope Sunland inverter introduction and common models
It is hoped that Sunland inverter is mainly used in three-phase asynchronous AC motor to control and adjust the motor speed. Sunland inverter is mainly composed of microprocessor, including rectification, filtering, inverter, brake, drive, detection, etc. In order to achieve the purpose of changing the power supply voltage, according to the actual needs of the motor...
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At the physical level, the stable operation of the inverter is guaranteed-Senlan inverter
For the most popular electrical control equipment inverter (Variable-frequency Drive, VFD), as a precision electronic industrial control equipment, in order to run smoothly for a long time, we, as professional and technical personnel, need to be on the VFD device or before the operation.
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Misunderstandings and countermeasures of industrial control inverter - Senlan
Today, with the rapid development of science and technology, with the continuous improvement of industrial automation, inverters have also been widely used. Choosing a suitable inverter is very important to ensure the normal and efficient work of the inverter, but in practice, it is necessary to pay attention to some ...
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Senlan frequency conversion cabinet wiring steps
The wiring of the inverter cabinet refers to the correct connection between the inverter and the motor, power supply and other equipment. The wiring requirements of the cabinet are carried out in accordance with the electrical principles and equipment specifications to ensure the normal operation and safety of the system.
The following is the cabinet ...
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Advantages of choosing a frequency converter
Advantage 1: Energy saving
The motor adopts frequency converter speed regulation, and its power can be improved by 5%-10%.
The inverter accounts for 20%-30% of the total capacity of the communication motor in the drag of load equipment such as fans, pumps, extruders, mixers, etc., which has a significant energy-saving effect, because the consumption of the fan and water pump is significant.
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Inverter water inlet maintenance method - Sunland inverter
The first step is not to turn on electricity! First open the inverter panel, wipe the inverter dry, and then use a hair dryer to dry the display, PC board, push board, power components, fans, etc., with 95% alcohol, scrub the components with 95% alcohol, and dry the hair dryer with cold air.
Step 2: After an hour, use alcohol ...
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Advantages of Senlan vector control system
Dynamic "fast response" DC motors are rectified constrained and excessively high di/dt is not allowed. The asynchronous motor is only constrained by the capacity of the inverter, and the multiple of the forced current can be very high, so the speed echoes quickly, generally reaching the millisecond level, which has surpassed the DC motor in terms of speed.
At low frequencies ...
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Inverter line control mode - Senlan inverter
Each inverter (Variable-frequency Drive, VFD) is subject to different line control, and the methods of voltage control and current control can be divided into two categories, one is voltage type and the other is current type. The control mode can also be divided into voltage control and current type. The main circuit method and ...
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How far apart is the motor from the inverter - Senlan inverter
The supplier of the supporting equipment of the inverter reminds you that the voltage waveform output by the inverter is similar to a sine wave, but not a real sine wave. Its waveform contains a large number of harmonic components, especially the higher harmonics will increase the output current of the inverter, causing the motor winding to heat up, and produce oscillation.
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Damage and repair of internal electronic components of the inverter - Hope Sunland
1. Repair the damage of the inverter rectifier block
The damage of the inverter rectifier bridge is also one of the common faults of the inverter, the inverter rectifier block in the early production is mainly diode rectifier, and now some rectifier blocks choose the rectifier mode of thyristor (voltage regulation and frequency modulation inverter).
Middle...
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Sunland attended the 2015 Industrial Automation Exhibition in Nuremberg, Germany
November 24, 2015 - November 26, 2015, "Germany Nuremberg Industrial Automation Exhibition" was successfully carried out at the Nuremberg International Exhibition Center in Germany, and it is expected that Sunland as a domestic professional inverter manufacturer also participated in the exhibition, in this exhibition, in addition to the usual SB70, ...
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Senlan inverter motor failure analysis
1. The motor slows down too slowly
1) If the deceleration time is set too long, reduce the deceleration time
2) Install a braking resistor
3) Add DC braking
2. The motor is overheated
1) The load is too large, and the practical moment has exceeded the ...
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