1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the current value of the practical 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, it should be fully considered that the output of the inverter contains higher harmonics, which will form the power factor and efficiency of the motor.
3. If the inverter wants to run with a long cable, the inverter should be expanded by one gear to select or install an output reactor at the output end of the inverter.
Fourth, 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 general motors.
7. When the inverter is used in a pole-changing motor, full attention should be paid to selecting 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 does not have an explosion-proof structure, and the inverter should be set outside the dangerous place.
9. When the inverter is used to drive the gear reducer motor, the application range is limited by the smooth method of the gear rolling part. 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 easy to overcurrent tripping due to ripple current, so it is necessary to choose an inverter with a slightly larger capacity than the general capacity.
11. When the inverter drives the synchronous motor, the output capacity is reduced by 10%-20% compared with the power frequency power supply.
12. In the case of loads with large torque fluctuations such as compressors and vibrating machines and peak loads such as hydraulic pumps, the power frequency operation should be understood, and the rated output current of the inverter with a larger maximum current 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 are 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 drives is matched. First of all, according to the nature of the load, the correct selection of the type of inverter. The general principle is what nature of the load characteristics with what characteristics of the inverter.
(1) Constant torque production equipment – within the speed control range, the load torque is basically constant. A frequency converter with constant torque function should be selected. It can only be maintained at 150% of the rated current for 1 minute at an overload.
(2) Square torque production equipment – within the speed control range, the load torque is proportional to the square of the speed, centrifugal fan, water pump is its typical representative. The overload of the inverter with characteristics can be small, 110%-120% of the rated current overload for 1 minute,
(3) Constant power load production equipment - within the speed regulation range, the speed is low and the torque is large; The rotational speed is high and the torque is small. Typical equipment such as machine tools and winding weaves.
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