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  • No : 21473
  • Release Date : 2018/08/22 16:27
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Imbalanced input and output side power supplies

When different loads are applied to the motor with two frequencies using the FR-A500 inverter, the resulting input and output side power supplies are as shown below.
The input and output side power supplies fundamentally differ from each other. Are there any ratio and regularity for this difference?
Also, let me know cause and mechanism of the difference.
Is the following data normal?
A Frequency: 29.46 Hz, input side power supply: 5.83 kW, output power supply: 11.65 kWB Frequency: 58.47 Hz, input side power supply: 6.27 kW, output power supply: 9.47 kW
Category : 

Answer

1. In general, the input power of the inverter is always larger than the output power because the inverter loss is added to the motor loss.

2. In both of cases A and B, it is strange that the input power is smaller. The output power should be smaller for the amount of the inverter loss.

It is considered that the instrument cannot measure the correct value due to the high-frequency components contained in the output voltage of the inverter and indicates a larger value. You need to insert a filter to remove high-frequency components. (If your instrument has a filtering function, use it.)
Product Name
Inverter, magnet motor drive
Product Category
Others
Series
FR-A500

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