Move the sampling of the frequency converter current to the output side, because the output current waveform is close to a sine wave, and the error can be compensated in an appropriate way. Choose an electromagnetic current meter, which can reflect the effective value of the current containing higher harmonics, but the error is large, especially when the current is small.
Change the installation location of the current transformer
Move the sampling of the frequency converter current to the output side, because the output current waveform is close to a sine wave, and the error can be compensated in an appropriate way.
Selection of current meter
The electromagnetic current meter is selected, which can reflect the effective value of the current containing high-order harmonics, but the error is large, especially when the current is small.
Ways to solve the current error on the field control box
Install current transformers in the on-site control box to reduce cable transmission errors.
Methods to solve the current error of the frequency-variable speed motor in the control room
Add current transformers and current transducers to reduce errors and ensure the safety of computer systems.