The quality of a thing is relative, the inverter as a power supply used to drive the motor to run, its function is to regulate the speed, under the premise of normal wiring, reasonable parameters, and no fault with the load, if the speed of the motor can be controlled according to the requirements, the shaking error is less than the equipment requirements, the inverter is a good inverter.
It is normal for an inverter to meet the speed requirements
General general inverter, the frequency is often accurate to one decimal place, for example, 0.01HZ, about the additional frequency of 50HZ, 0.01+50=0.01%, but this is only the resolution on the display, in fact, it is often unattainable, the general V/F open-loop control of the inverter, the accuracy can be controlled within +0.5%, and many loads, the general speed fluctuation range within 1-5% can meet the process requirements, especially the fan pump, The accuracy requirements are relatively rough, because as long as the inverter controls the motor with load, the speed fluctuation is less than 5%, which is a normal inverter.
If the speed of the inverter control motor fluctuates by more than 5%, it does not necessarily mean that the inverter is broken, it may only be caused by some parameters that are not adjusted, such as the V/F ratio is not set reasonably, and the acceleration and deceleration time is too short, which may lead to the acceleration and deceleration shaking fiercely, and then adjusting the parameters from the beginning can solve the problem.
Regarding the vector control of the inverter, due to the encoder response, the highest precision can be 0.01%, and the inverter shows the same resolution, this is of course the accuracy under the steady state, in fact, the acceleration and deceleration will also be greatly shaken, and the general equipment, will not be so high, generally around 0.05% has been able to meet the control needs of most equipment.
Vector control, depends on the accuracy of the parameters of the motor model, and at the same time has a lot to do with the adjustment of some gain and integration parameters in the inverter.
The inverter is broken, and basically the motor cannot be dragged to run
Due to the fact that the speed of the bow is shaken by the hardware problem, the inverter is very few, because the inverter planning has many protection functions, such as overcurrent, overvoltage, undervoltage, overheating, overload, lack of flat alarm, when these alarms occur, and can not be reset when the situation occurs, it can be considered that the inverter has a hardware problem, of course, the premise is that the peripheral circuit is normal, and there is no problem with the motor and load.
If the power is not displayed, it is often the switching power supply that burns, forming that the motherboard has no power supply operation, and the display screen does not appear.
There are also some cases that the no-load operation is normal, and the overcurrent and overload alarm with the load are generally caused by the problem of the driving circuit, or the lack of withstand voltage of the module.
If it is acceleration and deceleration and overcurrent, it is often the bus capacitor that is aging, and of course the capacitor should be repaired and replaced.
As for the occurrence of short circuit tripping, smoke or peculiar smell during operation, of course, it can be assumed that there are components burned inside, and it cannot be used continuously.
Some of them are broken and appear normal, but they can't withstand the control logic and start running, and in the case of restoring the factory value and setting the parameters from scratch to exclude the parameter adjustment, it can also be considered that the inverter is broken.
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