Troubleshooting66.10 Troubleshooting without Fault DisplayYASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual 325◆ Motor Rotates in the Opposite Direction from the Run CommandCause Possible SolutionPhase wiring between the drive and motor is incorrect. • Check the wiring between the drive and motor.• Connect drive output terminals U/T1, V/T2, and W/T3 in the right orderto match motor terminals U, V, and W.• Switch two motor cables (U, V, and W) to reverse motor direction.The forward direction for the motor is set up incorrectly. • Connect drive output terminals U/T1, V/T2, and W/T3 in the right orderto match motor terminals U, V, and W.• Switch two motor cables (U, V, and W) to reverse motor direction.A - ForwardRotationDirectionB - LoadShaftFigure 6.1 Forward Rotating MotorNote:• For Yaskawa motors, forward is designated as being counterclockwisewhen looking from the motor shaft.• Refer to the specifications of the motor being used, and confirm theforward rotation direction. The forward rotation direction of motorsmay differ depending on manufacturer and type.The forward run and reverse run signal connections of thedrive’s control circuit terminals and control panel side areincorrect.Wire the control circuit correctly.The motor is running at almost 0 Hz and the Speed Searchestimated the speed to be in the opposite direction.Disable bi-directional search by setting b3-14 = 0 [Bi-Direction SpeedSearch Select = Disabled] so that speed search is performed only in thespecified direction.◆ Motor Rotates in One Direction OnlyCause Possible SolutionThe drive prohibits reverse rotation. Set b1-04 = 0 [Reverse Operation Selection = Reverse enabled].A Reverse run signal has not been entered, although 3-Wiresequence is selected. Enable the reverse operation by setting H1-xx = 0 [3-Wire Sequence] ON.◆ Motor is Too HotCause Possible SolutionThe load is too heavy. • Reduce the load.• Increase the acceleration and deceleration times.• Check the values set in L1-01 [Motor Overload Protection Select], L1-02[Motor Overload Protection Time], and E2-01 [Motor Rated Current(FLA)].• Use a larger motor.Note:Keep in mind that the motor also has a short-term overload rating. Checkthis carefully before drive settings.The motor is running continuously at an extremely lowspeed.• Change the run speed.• Switch to a drive dedicated motor.The drive is operating in a vector control mode but Auto-Tuning has not yet been performed.• Perform Auto-Tuning.• Calculate motor data and reset motor parameters.• Switch to A1-02 = 0 [Control Method Selection = V/f Control].BA
