Noise From Drive Or Motor Cables When The Drive Is Powered On; Earth Leakage Circuit Breaker (Elcb) Trips During Run; Unexpected Noise From Connected Machinery Occurs When Motor Rotates; Oscillation Or Hunting Occurs When Motor Rotates - YASKAWA GA700 Technical Manual

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Noise From Drive or Motor Cables When the Drive is Powered On

Cause
Relay switching in the drive generates excessive noise.
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Earth Leakage Circuit Breaker (ELCB) Trips During Run

Cause
There is excessive leakage current from the drive.
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Unexpected Noise from Connected Machinery Occurs When Motor Rotates

Cause
The carrier frequency is at the resonant frequency of the
connected machinery.
The drive output frequency is the same as the resonant
frequency of the connected machinery.
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Oscillation or Hunting Occurs When Motor Rotates

Cause
The frequency reference is assigned to an external source
and the signal is noisy.
The cable between the drive and motor is too long.
The PID parameters are not sufficiently adjusted.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
6.10 Troubleshooting without Fault Display
Possible Solution
• Lower the carrier frequency by changing the setting of C6-02 [Carrier
Frequency Selection].
• Connect a noise filter to the input side of the drive's power supply.
• Connect a noise filter to the output side of the drive.
• Separate the control circuit wiring from the main circuit wiring.
• Perform wiring using a metallic cable gland.
• Shield the periphery of the drive with metal.
• Reevaluate the grounding of the drive and motor.
• Check that ground faults have not occurred in the wiring or motor.
Possible Solution
• Increase the ELCB sensitivity or use ELCB with a higher threshold.
• Lower the carrier frequency by changing the setting of C6-02 [Carrier
Frequency Selection].
• Reduce the length of the cable used between the drive and the motor.
• Install a noise filter or AC reactor on the output side of the drive. Set C6-
02 = 1 [2.0 kHz] when connecting an AC reactor.
• Disable the internal EMC filter.
Possible Solution
• Adjust C6-02 to C6-05 [Carrier Frequency].
• Set C6-02 = 1 to 6 [Carrier Frequency Selection = Frequency other than
Swing PWM], and check whether the abnormal noise persists.
Note:
The drive may have trouble assessing whether white noise is being
generated from the drive or from the machine if C6-02 = 7 to A [Carrier
Frequency Selection = Swing PWM] has been set.
• Adjust d3-01 to d3-04 [Jump Frequency].
• Place the motor on a rubber pad to reduce vibration.
Possible Solution
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 value of H3-13 [Analog Input FilterTime Constant].
• Perform Auto-Tuning.
• Make the wiring as short as possible.
Readjust b5-xx [PID control].
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