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Uv1
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DC Bus Undervoltage
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There is a phase loss 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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Tighten the terminal screws to the correct tightening torque.
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The drive input power voltage is changing too much.
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Examine the input power for problems.
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Make the drive input power stable.
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If the input power supply is good, examine the magnetic contactor on the main circuit side for problems.
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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 become unserviceable.
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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 relay or contactor on the soft-charge bypass relay is damaged.
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U4-06 [PreChargeRelayMainte] shows the performance life of the soft-charge bypass relay. If U4-06 is more than 90%, replace the board or the drive. For information about replacing the board, contact Yaskawa or your nearest sales representative.
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Note:
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The drive detects this error if the DC bus voltage decreases below the level set in L2-05 [Undervoltage Detection Lvl (Uv1)] while the drive is running.
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The Uv1 detection level is approximately 190 V for a 200 V class drives. The detection level is approximately 380 V for 400 V class drives. The detection level is approximately 350 V when E1-01 [Input AC Supply Voltage] < 400.
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Do a Fault Reset to clear the fault.
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Fault trace is not available for this fault.
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L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
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