There Is Audible Noise From The Drive Or Motor Cables When The Drive Is Energized; The Ground Fault Circuit Interrupter (Gfci) Trips During Run; Motor Rotation Causes Unexpected Audible Noise From Connected Machinery; Motor Rotation Causes Oscillation Or Hunting - YASKAWA GA80U4720ABM Manual

Causes
The drive and motor system reached the torque limit.
The load is more than the internal torque limit as specified by the drive rated
current.
◆
There Is Audible Noise from the Drive or Motor Cables When the Drive Is
Energized
Causes
The relay switching in the drive is making too much noise.
◆

The Ground Fault Circuit Interrupter (GFCI) Trips During Run

Causes
There is too much leakage current from the drive.
◆

Motor Rotation Causes Unexpected Audible Noise from Connected Machinery

Causes
The carrier frequency and the resonant frequency of the connected machinery
are the same.
The drive output frequency and the resonant frequency of the connected
machinery are the same.
◆

Motor Rotation Causes Oscillation or Hunting

Causes
The frequency reference is assigned to an external source, and there is electrical
interference in the signal.
The cable between the drive and motor is too long.
The PID parameters are not sufficiently adjusted.
YASKAWA SIEPC71061737B GA800 Drive Technical Reference
7.10 Troubleshooting Without Fault Display
Possible Solutions
• Examine the values set in L7-01 to L7-04 [Torque Limit] and increase them if necessary.
Note:
If the torque limit is enabled, deceleration time can increase because the drive cannot output
more torque than the limit.
• If H3-02, H3-10, H3-06 = 10, 11, 12, 15 [MFAI Function Select = Torque Limit] has been set,
examine the settings for the MFAIs.
• Examine the values set in H3-02, H3-10, and H3-06.
• Use U1-13 to U1-15 [Terminal A1, A2, A3 Input Voltage] to make sure that the analog input
values set to terminals A1, A2, and A3 are applicable.
Replace the drive with a larger capacity model.
Possible Solutions
• Use C6-02 [Carrier Frequency Selection] to decrease the carrier frequency.
• Connect a noise filter to the input side of the drive power supply.
• Connect a noise filter to the output side of the drive.
• Isolate the control circuit wiring from the main circuit wiring.
• Use a metal cable gland to wire the drive.
• Shield the periphery of the drive with metal.
• Make sure that the drive and motor are grounded correctly.
• Make sure that ground faults have not occurred in the wiring or motor.
Possible Solutions
• Increase the GFCI sensitivity or use GFCI with a higher threshold.
• Use C6-02 [Carrier Frequency Selection] to decrease the carrier frequency.
• Decrease 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.
Possible Solutions
• Adjust C6-02 to C6-05 [Carrier Frequency].
• Set C6-02 = 1 to 6 [Carrier Frequency Selection = Frequency other than Swing PWM].
Note:
If C6-02 = 7 to A [Carrier Frequency Selection = Swing PWM], the drive will not know if the
noise comes from the drive or the machine.
• Adjust d3-01 to d3-04 [Jump Frequency].
• Put the motor on a rubber pad to decrease vibration.
Possible Solutions
Make sure that electrical interference does not have an effect on the signal lines.
• Isolate control circuit wiring from main circuit wiring.
• Use twisted-pair cables or shielded wiring for the control circuit.
• Increase the value of H3-13 [Analog Input FilterTime Constant].
• Do Auto-Tuning.
• Make the wiring as short as possible.
Adjust b5-xx [PID control].
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