7.10 Troubleshooting Without Fault Display
264 SIEPCYEUOQ2V01A Q2V Technical Manual
◆ PID Output Fault
Causes Possible Solutions
There is no PID feedback input. • Examine the MFAI terminal settings.
• Make sure that H3-02, H3-10 = F [MFAI Function Select = PID Fbk].
• 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 [AI1 Gain Setting, AI2 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].
◆ The Output Frequency Is Lower Than the Frequency Reference
Causes Possible Solutions
The frequency reference is in the Jump frequency range. Adjust d3-01 to d3-03 [Jump Frequency 1 to Jump Frequency 3] and d3-04 [Jump Frequency
Width].
Note:
Enabling the Jump frequency prevents the drive from outputting the frequencies specified in
the Jump range.
The upper limit for the frequency reference has been exceeded. Set E1-04 [Max Output Frequency] and d2-01 [FRef Upper Limit] to the best values for the
application.
Note:
This calculation supplies the upper value for the output frequency:
E1-04 × d2-01 / 100
A large load triggered Stall Prevention function during acceleration. • Decrease the load.
• Adjust L3-02 [StallP Level@Accel].
L3-01 = 4 [StallP Mode@Accel = ILim Mode] has been set. 1. Check whether the V/f pattern and motor parameter settings are appropriate, and set them
correctly.
2. If this does not solve the problem, and it is not necessary to limit the current level of stall
during acceleration, adjust L3-02.
3. If this does not solve the problem, set L3-01 = 2 [General Purpose].
The motor is rotating at this speed:
b2-01 [ZSpd/DCI Threshold] ≤ Motor Speed < E1-09 [Min Output
Frequency]
Set E1-09 < b2-01.
◆ The Motor Is Making an Audible Noise
Causes Possible Solutions
100% of the rated output current of the drive was exceeded while operating
at low speeds.
If the sound is coming from the motor, set L8-38 = 0 [Carrier Reduction Mode = Disabled].
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