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 efficiency 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 applications, such as high ambient temperature, high switching frequency, high altitude, etc., it will cause the descaling of the inverter at this moment, 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, 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 inverter is used to drive the gear reducer motor, the application range is limited by the smooth way of the gear rotation part. Do not exceed the high speed tolerance.
10. When the inverter drives the winding 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 select 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. For compressors, vibrating machines and other loads with large torque fluctuations and oil pressure pumps and other peak loads, we should understand the power frequency operation status and select an inverter with an additional output current that is larger than its largest current.
13. When the inverter controls the roots fan, because its starting current is very large, we must pay attention to whether the capacity of the inverter is large enough when selecting the inverter.
14. When selecting the inverter, be sure 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 are not appropriate, the frequency conversion speed regulation system composed of it cannot achieve high reliability, or even cannot operate, so how to ensure the normal and efficient operation of the frequency conversion adjustment system? We need 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.
The general principle is what nature of the load characteristics with what characteristics of the inverter.
(1) Constant torque production equipment - within the speed regulation range, the load torque is basically constant. A frequency converter with constant torque performance should be selected. Its overload capacity is 150% and the extra current is maintained for 1 minute.
(2) Square torque production equipment - within the speed regulation range, the load torque is proportional to the square of the speed, that is, M∝n2, centrifugal fan, water pump is its typical representative. The inverter with M∝n2 characteristics has a small overload capacity, 110%-120% additional current overload for 1 minute.
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