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  • No : 22069
  • Release Date : 2018/08/22 16:30
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Speed change due to power supply voltage fluctuation

I am considering to use the inverter under an environment where the power supply voltage fluctuates.
How does the speed change in response to fluctuation of the inverter's power supply voltage?

1. Can I assume that if the fluctuation is within the "Power supply/AC permissible voltage fluctuation" indicated on the catalog, the "control specification/frequency precision" is guaranteed (that is, speed does not change due to power supply voltage fluctuation)?
(Assume that the frequency stays within the fluctuation tolerance.)
Example: For the A500, when the power supply voltage stays within 323 to 528 V, the frequency output fluctuates within ±0.2% of the maximum output frequency.
Please answer for V/F control and Advanced magnetic flux vector control cases individually, if possible.
2. What happens if the power supply voltage rises over the tolerance above?
Also, what is the range where the undervoltage protection does not work when the power supply voltage goes below the lower limit? What happens if the upper limit above is exceeded?
Category : 

Answer

1. The output frequency satisfies the "control specification/frequency precision" even when the power supply voltage changes, but the output voltage cannot rise over the input power supply voltage.
Therefore, when the input voltage goes low, the output voltage decreases, the output torque decreases, and then the actual rotation speed may decrease.
Under advanced flux vector control, the actual rotation speed fluctuates less than V/F control due to slip compensation.
When the input power supply voltage is high, sufficient torque is generated and the actual rotation speed does not decrease while it does when the power supply voltage drops.

2. When the power supply voltage goes out of the tolerance range, it is considered that the operation mentioned in 1. becomes conspicuous.
Note that when the power supply voltage goes out of the tolerance range, the undervoltage or overvoltage error may occur. Therefore, always use the inverter within the allowable range.
Product Name
Inverter, magnet motor drive
Product Category
Inverter
Series
FR-E500, FR-A500

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