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Uv
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DC Bus Undervoltage
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The drive input power voltage is changing too much.
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Use a better power supply voltage to align with the drive rated voltage.
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Make the drive input power stable.
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If there is not a fault with the input power supply, examine the magnetic contactor on the main circuit side for faults.
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A phase loss occurred in the drive input power.
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Correct errors with the wiring for main circuit drive input power.
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There is loose wiring in the drive input power terminals.
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Examine for loose screws and tighten them as specified by the tightening torque values in the manual.
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There was a loss of power.
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Use a better power supply.
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The main circuit capacitors have deteriorated.
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Examine the capacitor maintenance time in monitor U4-05 [CapacitorMaintenance]. If U4-05 is more than 90%, replace the control board or the drive. For information about replacing the control board, contact Yaskawa or your nearest sales representative.
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The drive input power transformer is too small and voltage drops when the power is switched on.
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Check for an alarm when a molded-case circuit breaker, Leakage Breaker (ELCB, GFCI, or RCM/RCD) (with overcurrent protective function), or magnetic contactor is ON.
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Check the capacity of the drive power supply transformer.
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Air inside the drive is too hot.
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Measure the ambient temperature of the drive.
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The Charge LED is broken.
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Replace the board or the drive. For information about replacing the control board, contact Yaskawa or your nearest sales representative.
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Note:
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The drive detects this error if one of these conditions is correct when the Run command has not been input (while the drive is stopped).
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The DC bus voltage < L2-05 [Undervoltage Detection Lvl (Uv1)].
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The Contactor that prevents inrush current in the drive was opened.
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There is low voltage in the control drive input power.
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If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
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