Troubleshooting
7
7.10 Troubleshooting Without Fault Display
YASKAWA SIEPC71061753C GA500 Technical Manual 303
◆ 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.
The drive output frequency and the resonant frequency of the connected
machinery are the same.
• Adjust d3-01 to d3-04 [Jump Frequency].
• Put the motor on a rubber pad to decrease vibration.
◆ 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.
• Increase the value of H3-13 [Analog Input FilterTime Constant].
The cable between the drive and motor is too long. • Do Auto-Tuning.
• Make the wiring as short as possible.
The PID parameters are not sufficiently adjusted. Adjust b5-xx [PID control].
◆ PID Output Fault
Causes Possible Solutions
There is no PID feedback input. • Examine the MFAI terminal settings.
• Make sure that H3-02, H3-10 = B [MFAI Function Select = PID Feedback].
• Make sure that the MFAI terminal settings agree with the signal inputs.
• Examine the connection of the feedback signal.
• Make sure that you set b5-xx [PID Control] correctly.
Note:
If there is no PID feedback input to the terminal, the detected value is 0, which causes a PID
fault and also causes the drive to operate at maximum frequency.
The detection level and the target value do not align. Use H3-03, H3-11 [Terminal A1 and A2 Gain Setting] to adjust PID target and feedback signal
scaling.
Note:
PID control keeps the difference between the target value and detection value at 0. Set the
input level for the values relative to each other.
Reverse drive output frequency and speed detection. When output frequency
increases, the sensor detects a speed decrease.
Set b5-09 = 1 [PID Output Level Selection = Reverse output (reverse acting)].
◆ The Starting Torque Is Not Sufficient
Causes Possible Solutions
Auto-Tuning has not been done in vector control method. Do Auto-Tuning.
The control method was changed after doing Auto-Tuning. Do Auto-Tuning again.
Stationary Auto-Tuning for Line-to-Line Resistance was done. Do Rotational Auto-Tuning.
To Next Page
Loading...
Need help?
General
