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E.C fault error code in Mitsubishi FR-XC drive

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Cause : Overload trip (electronic thermal relay function) comes when the protection of transistor, electronic thermal relay activates in inverse-time characteristics against the converter input to stop the output of the converter.

• Check the motor for the use under overload.
• Check that the total capacity of the inverters used is not larger than the capacity of the converter.
• Check that the permissible voltage imbalance ratio is within 3%.

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