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Q : In EC160A VFD, the cooling fan runs continuously after power-on while the drive operates normally. Is this normal?
A: In this condition, check the driver board—specifically the Q3 transistor. A faulty Q3 transistor can cause the cooling fan to run continuously even without a RUN command.
After replacing the defective component, the drive operates normally and the fan behavior returns to standard logic.
Normal Condition: NDZ4
Faulty Condition: 6003XY1XN04
After replacing the defective component, the drive operates normally and the fan behavior returns to standard logic.
Normal Condition: NDZ4
Faulty Condition: 6003XY1XN04
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