7.10 Troubleshooting Without Fault Display282 YASKAWA SIEPC71061753A GA500 Technical Manual◆ The Motor Rotates in the Opposite Direction from the Run CommandCauses Possible SolutionsThe phase wiring between the drive and motor is incorrect. • Examine the wiring between the drive and motor.• Connect drive output terminals U/T1, V/T2, and W/T3 in the correct sequence to agree withmotor 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 incorrectly. • Connect drive output terminals U/T1, V/T2, and W/T3 in the correct sequence to agree withmotor terminals U, V, and W.• Switch two motor cables U, V, and W to reverse motor direction.A - ForwardRotationDirectionB - LoadShaftFigure 7.1 Forward Rotating MotorNote:• For Yaskawa motors, the forward direction is counterclockwise when looking from themotor shaft side.• Refer to the motor specifications, and make sure that the forward rotation direction iscorrect for the application. The forward rotation direction of motors can be different fordifferent motor manufacturers and types.The signal connections for forward run and reverse run on the drive controlcircuit terminals and control panel side are incorrect. Correctly wire the control circuit.The motor is running at almost 0 Hz and the Speed Search estimated thespeed to be in the opposite direction. Set b3-14 = 0 [Bi-directional Speed Search = Disabled], then the drive will only do speed searchin the specified direction.◆ The Motor Rotates in Only One DirectionCauses Possible SolutionsThe drive will not let the motor rotate in reverse. Set b1-04 = 0 [Reverse Operation Selection = Reverse Enabled].The drive did not receive a Reverse run signal and 3-Wire sequence isselected. Turn ON the terminals to which H1-xx = 0 [3-Wire Sequence] is set, and then enable reverseoperation.◆ The Motor Is Too HotCauses Possible SolutionsThe load is too heavy. • Decrease the load.• Increase the acceleration and deceleration times.• Examine the values set in L1-01 [Motor Overload (oL1) Protection], L1-02 [Motor OverloadProtection Time], and E2-01 [Motor Rated Current (FLA)].• Use a larger motor.Note:The motor also has a short-term overload rating. Examine this rating carefully before settingdrive parameters.The motor is running continuously at a very low speed. • Change the run speed.• Use a drive-dedicated motor.The drive is operating in a vector control mode, but Auto-Tuning has notbeen done. • Do Auto-Tuning.• Calculate motor parameter and set motor parameters.• Set A1-02 = 0 [Control Method Selection = V/f Control].The voltage insulation between motor phases is not sufficient. • Use a motor with a voltage tolerance that is higher than the maximum voltage surge.• Use a drive-dedicated motor that is rated for use with AC drives for applications that use amotor on drives rated higher than 400 V class.• Install an AC reactor on the output side of the drive and set C6-02 = 1 [Carrier FrequencySelection = 2.0 kHz].Note:When the motor is connected to the drive output terminals U/T1, V/T2, and W/T3, surgesoccur between the drive switching and the motor coils. These surges can be three times thedrive input power supply voltage (600 V for a 200 V class drive, 1200 V for a 400 V classdrive).BA
