Yaskawa Z1000U - Manual (Page 225)

u Noise From Drive or Motor Cables When the Drive is Powered On
Cause Possible Solutions
Relay 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 Run
Cause Possible Solutions
Excessive 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.
• Install a noise filter or reactor on the output side of the drive. Set the carrier frequency to 2 kHz
when connecting a reactor.
• Disable the internal EMC filter.
u Connected Machinery Vibrates When Motor Rotates
n Unexpected Noise from Connected Machinery
Cause Possible Solutions
The carrier frequency is at the resonant frequency of
the connected machinery.
Adjust the carrier frequency using parameters C6-02 through C6-05.
The drive output frequency is the same as the resonant
frequency of the connected machinery.
• Adjust the parameters used for the Jump frequency function (d3-01 through d3-04) to skip the
problem-causing bandwidth.
• Place the motor on a rubber pad to reduce vibration.
n Oscillation or Hunting
Cause Possible Solutions
Insufficient tuning.
Perform Auto-Tuning.
Refer to Motor Performance Fine-Tuning on page 186 .
Gain is too low when using PID control. Refer to the Programming Manual for details.
The frequency reference is assigned to an external
source 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.
5.10 Troubleshooting without Fault Display
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 225
5
Troubleshooting