7.10 Troubleshooting Without Fault Display
300 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
◆ 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, C6-03, C6-04, and C6-05 [Carrier Frequency Selection, Carrier Upper
Frequency Limit, Carrier Lower Frequency Limit, and Carrier Freq Proportional Gain].
• 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 user 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, d3-02, d3-03, and d3-04 [Jump Frequency 1, Jump Frequency 2, Jump
Frequency 3, and Jump Frequency Width].
• 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 [An.In 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: PID CONTROL parameters.
◆ 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 = F [AI1 Function Selection, AI2 Function Selection, AI3
Function Selection = PID Fbk] 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: 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, and H3-07 [AI1 Gain Setting, AI2 Gain Setting, and AI3 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].
◆ 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.
◆ The Motor Rotates after the Drive Output Is Shut Off
Causes Possible Solutions
DC Injection Braking is too low and the drive cannot decelerate correctly. • Increase the value set in b2-02 [DCI Braking Current].
• Increase the value set in b2-04 [DCInj Time@Stop].
The stopping method makes the drive coast to stop. Set b1-03 = 0 or 2 [Stopping Method Selection = Ramp->Stop, DC Inj->Stop].
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