YASKAWA A1000 Series Quick Start Manual

Also see for A1000 Series: Installation manual Technical manual Quick start guide Technical manual Manual

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5 TroubleshootingYASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide 109Troubleshooting5Uv1DC Bus UndervoltageOne of the following conditions occurred while the drive was stopped:• Voltage in the DC bus fell below the undervoltage detection level (L2-05)• For 200 V class: approximately 190 V• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400) The fault is outputonly if L2-01 = 0 or L2-01 = 1 and the DC bus voltage has fallen below the level set to L2-05 forlonger than the time set to L2-02.Cause Possible SolutionInput power phase loss. • The main circuit drive input power is wired incorrectly.• Correct the wiring.One of the drive input power wiringterminals is loose.• Ensure there are no loose terminals.• Apply the tightening torque specified in this manual to fasten the terminals. Refer to Wire Gaugesand Tightening Torque on page 35There is a problem with the voltage fromthe drive input power.• Check the voltage.• Correct the voltage to be within the range listed in drive input power specifications.• If there is no problem with the power supply to the main circuit, check for problems with the maincircuit magnetic contactor.The power has been interrupted. Correct the drive input power.The main circuit capacitors are worn.• Check the maintenance time for the capacitors (U4-05).• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions onreplacing the control board, contact Yaskawa or your nearest sales representative.The relay or contactor on the soft-chargebypass circuit is damaged.• Cycle power to the drive and see if the fault reoccurs.• If the problem continues, replace either the control board or the entire drive. For instructions onreplacing the control board, contact Yaskawa or your nearest sales representative.• Check monitor U4-06 for the performance life of the soft-charge bypass.• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions onreplacing the control board, contact Yaskawa or your nearest sales representative.Digital Operator Display Fault NameUv2 Control Power Supply Voltage FaultVoltage is too low for the control drive input power.Cause Possible SolutionFor models CIMR-A2A0004 through2A0056 and CIMR-A4A0002 through4A0031: L2-02 was changed from itsdefault value without installing aMomentary Power Loss Ride-Thru unit.Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit.Control power supply wiring is damaged. • Cycle power to the drive. Check if the fault reoccurs.• If the problem continues, replace the control board, the entire drive, or the control power supply.Internal circuitry is damaged.• Cycle power to the drive. Check if the fault reoccurs.• If the problem continues, replace either the control board or the entire drive. For instructions onreplacing the control board, contact Yaskawa or your nearest sales representative.Digital Operator Display Fault NameUv3 Undervoltage 3 (Soft-Charge Bypass Circuit Fault)The soft-charge bypass circuit has failed.voF Output Voltage Detection FaultProblem detected with the voltage on the output side of the drive.