1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the actual motor current value should be used as the basis for the selection of the inverter, and the extra 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. 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.
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 applications, such as high ambient temperature, high switching frequency, high altitude, etc., it will cause the capacity reduction of the inverter, and the inverter needs to be enlarged 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, sufficient attention should be paid to selecting the capacity of the inverter, so that its 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 up outside the dangerous place.
9. When the frequency converter is used to drive the gear reducer motor, the scope of use is limited by the lubrication 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 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, vibrators and other loads with large torque fluctuations and hydraulic pumps and other peak loads, 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, because its starting current is very large, 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 work, 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. The general criterion is what the 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 fundamentally constant. A frequency converter with constant torque function should be selected. It can only be overloaded to maintain 150% additional current 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 can have a small overload, 110%-120% additional 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 high speed and small torque, i.e. M? NC (constant). Typical equipment such as machine tools and winding weaves.
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