When selecting the inverter, consider the influence of many factors, such as speed regulation mode, load rate, length of time, etc. In addition, it is necessary to consider whether the capacity matching of the motor is appropriate. It is also unscientific if the selection of the inverter does not consider whether the capacity matching is suitable. The selection of the frequency converter is a difficult problem for the technicians. If it is not done well, it will have an impact on the production application. If there is high reliability of the inverter body, and the inverter selection and capacity matching are not appropriate, the variable frequency speed control system can not achieve high reliability or even run, so how to ensure the normal frequency conversion adjustment system Run efficiently?
1, select the inverter according to the load characteristics
2. When selecting the inverter, the actual motor current value should be used as the basis for the inverter selection. The rated 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 efficiency of the motor to deteriorate.
3. If the inverter is to run with a long cable, the inverter should be amplified by one gear or installed with an output reactor at the output of the inverter.
4. When the inverter is used to control several motors in parallel, it is necessary to consider the total length of the cable from the inverter to the motor within the allowable range of the inverter.
5, for some special applications, such as high ambient temperature, high switching frequency, high altitude, etc., this will cause the derating of the inverter, the inverter needs to enlarge a file selection.
6. When selecting a frequency converter for a high-speed motor, it should be slightly larger than the inverter of a normal motor.
7. When the inverter is used for a pole-changing motor, pay full attention to the capacity of the inverter so that its maximum rated current is below the rated output current of the inverter.
8. When driving the explosion-proof motor, the inverter has no explosion-proof structure, and the inverter should be set outside the dangerous place.
9. When the inverter is used to drive the gear reduction motor, the scope of use is restricted by the lubrication method of the rotating part of the gear. Do not exceed the maximum speed tolerance.
10. When the inverter drives the wound rotor asynchronous motor, most of the existing motors are used. It is prone to overcurrent tripping due to ripple current, so choose a converter that is slightly larger than the normal capacity.
11. When the inverter drives the synchronous motor, it reduces the output capacity by 10% to 20% compared with the commercial frequency power supply.
12. For peak load situations such as compressors and vibration machines with large torque fluctuations and hydraulic pumps, it is necessary to understand the power frequency operation and select a frequency converter with a rated output current greater than its maximum current.
13. When the inverter controls the Roots blower, it must pay attention to whether the capacity of the inverter is large enough because the starting current is very large.
14. When selecting the inverter, be sure to check whether the protection level matches the situation on site.
15. Single-phase motors are not suitable for inverter drive.
1, select the inverter according to the load characteristics
2. When selecting the inverter, the actual motor current value should be used as the basis for the inverter selection. The rated 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 efficiency of the motor to deteriorate.
3. If the inverter is to run with a long cable, the inverter should be amplified by one gear or installed with an output reactor at the output of the inverter.
4. When the inverter is used to control several motors in parallel, it is necessary to consider the total length of the cable from the inverter to the motor within the allowable range of the inverter.
5, for some special applications, such as high ambient temperature, high switching frequency, high altitude, etc., this will cause the derating of the inverter, the inverter needs to enlarge a file selection.
6. When selecting a frequency converter for a high-speed motor, it should be slightly larger than the inverter of a normal motor.
7. When the inverter is used for a pole-changing motor, pay full attention to the capacity of the inverter so that its maximum rated current is below the rated output current of the inverter.
8. When driving the explosion-proof motor, the inverter has no explosion-proof structure, and the inverter should be set outside the dangerous place.
9. When the inverter is used to drive the gear reduction motor, the scope of use is restricted by the lubrication method of the rotating part of the gear. Do not exceed the maximum speed tolerance.
10. When the inverter drives the wound rotor asynchronous motor, most of the existing motors are used. It is prone to overcurrent tripping due to ripple current, so choose a converter that is slightly larger than the normal capacity.
11. When the inverter drives the synchronous motor, it reduces the output capacity by 10% to 20% compared with the commercial frequency power supply.
12. For peak load situations such as compressors and vibration machines with large torque fluctuations and hydraulic pumps, it is necessary to understand the power frequency operation and select a frequency converter with a rated output current greater than its maximum current.
13. When the inverter controls the Roots blower, it must pay attention to whether the capacity of the inverter is large enough because the starting current is very large.
14. When selecting the inverter, be sure to check whether the protection level matches the situation on site.
15. Single-phase motors are not suitable for inverter drive.
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