YASKAWA Sigma-7 Series Product Manual

Also see for SGD7W Series: Selection Manual

Contents

YASKAWA Sigma-7 Series Product Manual Manual pdf 127 page image

6.2 Warning Displays6.2.2 Troubleshooting Warnings6 Maintenance6-396.2.2 Troubleshooting WarningsThe causes of and corrections for the warnings are given in the following table. Contact yourYaskawa representative if you cannot solve a problem with the correction given in the table.Warning Number:Warning Name Possible Cause Confirmation Correction ReferenceA.900:Position DeviationOverflowThe ServomotorU, V, and W wiringis not correct.Check the wiring of theServomotor’s Main Cir-cuit Cables.Make sure that there are nofaulty connections in thewiring for the Servomotorand encoder.–A SERVOPACKgain is too low.Check the SERVO-PACK gains.Increase the servo gain,e.g., by using autotuningwithout a host reference.*The accelerationof the position ref-erence is too high.Reduce the referenceacceleration and tryoperating the SERVO-PACK.Reduce the acceleration ofthe position reference usinga MECHATROLINK com-mand. Or, smooth the posi-tion reference accelerationby selecting the positionreference filter (ACCFIL)using a MECHATROLINKcommand.–The excessiveposition deviationalarm level (Pn520× Pn51E/100) istoo low for theoperating condi-tions.Check excessive posi-tion deviation alarmlevel (Pn520 × Pn51E/100) to see if it is set toan appropriate value.Optimize the settings ofPn520 and Pn51E. *A failure occurredin the SERVO-PACK.–Turn the power supply tothe SERVOPACK OFF andON again. If the alarm stilloccurs, the SERVOPACKmay be faulty. Replace theSERVOPACK.–A.901:Position DeviationOverflow Alarm atServo ONThe position devi-ation when theservo was turnedON exceeded thepercentage setwith the followingformula:(Pn526 × Pn528/100)–Optimize the setting ofPn528 (Position DeviationOverflow Warning Level atServo ON).–A.90D:Position DeviationBetween Axes Over-flow WarningTwisting ofmechanical partshas occurredbetween axes Aand B.Check the positiondeviation between theaxes.Resolve the twisting ofmechanical parts betweenthe axes.–Set the Position CorrectionTable to appropriate values. page 3-7Axis A and axis Bare not synchro-nized with the ref-erence.Check the referenceposition for Axis A andAxis B.The host controller shouldcommand the system tosynchronize operation ofaxis A and axis B.–The value of(Pn66A × Pn669/100) is low for theoperating condi-tions.Check if the value of(Pn66A × Pn669/100) isappropriate.Set Pn66A and Pn669 toappropriate values. page 5-3Continued on next page.