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Factory Automation

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  • No : 22052
  • Release Date : 2018/08/22 16:30
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Output phase loss alarm

The output phase loss alarm occurs frequently. (Especially during acceleration/deceleration)
No problem was found with wiring between the inverter and motor.
No problem was found with the motor coil resistance as well.
Are there any other causes of the output phase loss alarm?
Category : 


If the output current is close to 25% of the rated current, output phase loss may occur when one or two phases of three phases go below 25%.
Therefore, when a motor with too small capacity compared with the inverter capacity is driven, the output phase loss alarm can occur.
When the output phase loss alarm occurs too often, set Pr.251 to "0" to disable the output phase loss alarm. (Note that some of the previous versions of the inverter do not have Pr.251.)
Product Name
Inverter, magnet motor drive
Product Category
FR-E500, FR-A500

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