7.10 Troubleshooting Without Fault Display
200 YASKAWA SIEPYEULA5001C LA500 Technical Manual
◆ Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled
Causes Possible Solutions
The stall prevention during deceleration setting is incorrect. • Examine the setting for L3-04 [Decel Stall Prevention Selection].
• When the drive has a dynamic braking option installed, set L3-04 = 0 [Disabled].
The deceleration time setting is too long. Set C1-02, C1-04, C1-06, or C1-08 [Deceleration Times] to applicable values.
The motor torque is not sufficient. Use a larger motor.
Note:
If these items are correct, the demand on the motor is more than the motor capacity:
• Parameter settings are correct.
• The drive does not detect ov [Overvoltage].
The drive and motor system reached the torque limit. 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.
The load is more than the internal torque limit as specified by the drive rated
current.
Replace the drive with a larger capacity model.
◆ There Is Audible Noise from the Drive or Motor Cables when You Energize the
Drive
Causes Possible Solutions
The relay switching in the drive is making too much noise. • 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.
◆ Residual Current Monitoring/Detection (RCM/RCD) Trips During Run
Causes Possible Solutions
There is too much leakage current from the drive. • Increase the RCM/RCD sensitivity or use RCM/RCD 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.
• Disable the internal EMC filter.
◆ Motor Rotation Causes Unexpected Audible Noise from Connected Machinery
Causes Possible Solutions
The carrier frequency and the resonant frequency of the connected
machinery are the same.
• 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.
◆ Motor Rotation Causes Oscillation or Hunting
Causes Possible Solutions
The frequency reference is assigned to an external source, and there is
electrical interference in the signal.
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.
The cable between the drive and motor is too long. • Do Auto-Tuning.
• Make the wiring as short as possible.
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