u Noise From Drive or Motor Cables When the Drive is Powered OnCause Possible SolutionsRelay switching in the drive generates excessive noise.• Lower the carrier frequency (C6-02).• Install a noise filter on the input side of drive input power.• Install a noise filter on the output side of the drive.• Place the wiring inside a metal conduit to shield it from switching noise.• Ground the drive and motor properly.• Separate the main circuit wiring and the control lines.• Make sure wires and the motor have been properly grounded.u Ground Fault Circuit Interrupter (GFCI) Trips During RunCause Possible SolutionsExcessive leakage current trips GFCI.• Check the wiring and rating of peripheral devices.• Increase the GFCI sensitivity or use GFCI with a higher threshold.• Lower the carrier frequency (C6-02).• Reduce the length of the cable used between the drive and the motor.• Disable the internal EMC filter.u Connected Machinery Vibrates When Motor Rotatesn Unexpected Noise from Connected MachineryCause Possible SolutionsThe carrier frequency is at the resonant frequency ofthe connected machinery. Adjust the carrier frequency using parameters C6-02 through C6-05.The drive output frequency is the same as the resonantfrequency of the connected machinery.• Adjust the parameters used for the Jump frequency function (d3-01 through d3-04) to skip theproblem-causing bandwidth.• Place the motor on a rubber pad to reduce vibration.Note: The drive may have trouble assessing the status of the load due to white noise generated from using Swing PWM (C6-02 = 7 to A).n Oscillation or HuntingCause Possible SolutionsInsufficient tuning. Perform Auto-Tuning.Refer to Motor Performance Fine-Tuning on page 290.Gain is too low when using PID control. Refer to b5: PID Control on page 160 for details.The frequency reference is assigned to an externalsource and the signal is noisy.• Ensure that noise is not affecting the signal lines.• Separate main circuit wiring and control circuit wiring.• Use twisted-pair cables or shielded wiring for the control circuit.• Increase the analog input time filter constant (H3-13).The cable between the drive and motor is too long. • Perform Auto-Tuning.• Reduce the length of the cable.6.10 Troubleshooting without Fault Display334 YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
