YASKAWA SGD7S-*A20**F62 Series Product Manual

Contents

5.6 Troubleshooting Warnings5-415 Maintenance5.6 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 Refer-enceA.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 SERVOPACKgains.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 positiondeviation alarm level(Pn520 × Pn51E/100) tosee if it is set to anappropriate value.Optimize the settings ofPn520 and Pn51E. *A failure occurredin the SERVO-PACK.–Turn the power supply tothe SERVOPACK OFF andON again. If an alarm stilloccurs, the SERVOPACKmay be faulty. Replace theSERVOPACK.–A.901:Position DeviationOverflow Alarm atServo ONThe position devi-ation exceededthe parameter set-tings (Pn526 ×Pn528/100) whenthe servo wasturned ON.–Optimize the setting ofPn528 (Position DeviationOverflow Warning Level atServo ON).–Continued on next page.