Troubleshooting
6
6.10 Troubleshooting Without Fault Display
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 395
◆ 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.
• See if H3-02, H3-10, H3-06 = B [MFAI Function Select = PID
Feedback] is set.
• Make sure that the MFAI terminal settings agree with the signal inputs.
• Examine the connection of the feedback signal.
• Make sure that b5-xx [PID Control] is set 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 agree. Use H3-03, H3-11, H3-07 [Terminal A1, A2, A3 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)].
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