6.8 Diagnosing and Resetting FaultsWhen a fault occurs and the drive stops, follow the instructions below to remove whatever conditions triggered the fault, thenrestart the drive.Note: An oC/SC fault will be displayed in the event of an IGBT failure. It may not be possible to reset this fault until the IGBT problem is corrected.u Fault Occurs Simultaneously with Power LossWARNING! Electrical Shock Hazard. Ensure there are no short circuits between the main circuit terminals (R/L1, S/L2, and T/L3) or betweenthe ground and main circuit terminals before restarting the drive. Failure to comply may result in serious injury or death and will causedamage to equipment.1. Turn on the drive input power.2. Use monitor parameters U2-oo to display data on the operating status of the drive just before the fault occurred.3. Remove the cause of the fault and reset.Note: 1. To find out what faults were triggered, check the fault history in U2-02. Information on drive status when the fault occurredsuch as the frequency, current, and voltage can be found in U2-03 through U2-32. Refer to Viewing Fault Trace DataAfter Fault on page 256 for information on how to view fault data.2. When the fault continues to be displayed after cycling power, remove the cause of the fault and reset.u If the Drive Still has Power After a Fault Occurs1. Look at the HOA keypad for information on the fault that occurred.2. Refer to Fault Displays, Causes, and Possible Solutions on page 228.3. Reset the fault. Refer to Fault Reset Methods on page 257.u Viewing Fault Trace Data After FaultStep Display/Result1. Turn on the drive input power. The first screen displays.DRV-OFFU1-01= 0.00HzU1-02= 0.00HzU1-03= 0.00 AFreq Ref (AUTO)LSEQLREFRLY DRV/BYP2. Press or until the monitor screen is displayed.DRV-OFFU1-01= 60.00HzU1-02= 0.00HzU1-03= 0.00 AMonitor MenuLSEQLREFRLY DRV/BYP3. Press to display the parameter setting screen.DRV-OFFU1-01= 60.00HzU1-02= 0.00HzU1-03= 0.00 AMonitorLSEQLREFRLY DRV/BYP4. Press and to scroll to monitor U2-02. The fault code shown in U2-02is the fault that occurred most recently.DRV-OFFU2-02= oCU2-03= 0.00HzU2-04= 0.00HzLast FaultLSEQLREFRLY DRV/BYP5. Press to view drive status information when fault occurred.Parameters U2-03 through U2-32 help determine the cause of a fault.Parameters to be monitored differ depending on the control mode.DRV-OFFU2-03= 0.00HzU2-04= 0.00HzU2-05= 0.00AFrequency RefLSEQLREFDRV-OFFU2-20= XX°CU2-01=U2-02=Heatsink TempLSEQLREFRLY DRV/BYPRLY DRV/BYP6.8 Diagnosing and Resetting Faults256 YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
