Yaskawa Z1000U User Manual Page 225

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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.
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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.
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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.
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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
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