Pid Output Fault; The Starting Torque Is Not Sufficient; The Motor Rotates After The Drive Output Is Shut Off; The Output Frequency Is Lower Than The Frequency Reference - Omron Q2V Series Technical Manual

7.10 Troubleshooting Without Fault Display
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PID Output Fault

Causes
There is no PID feedback input.
The detection level and the target value do not agree.
Reverse drive output frequency and speed detection. When output frequency
increases, the sensor detects a speed decrease.
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The Starting Torque Is Not Sufficient

Causes
Auto-Tuning has not been done in vector control method.
The control method was changed after doing Auto-Tuning.
Stationary Auto-Tuning for Line-to-Line Resistance was done.
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The Motor Rotates after the Drive Output Is Shut Off

Causes
DC Injection Braking is too low and the drive cannot decelerate correctly.
The stopping method makes the drive coast to stop.
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The Output Frequency Is Lower Than the Frequency Reference

Causes
The frequency reference is in the Jump frequency range.
The upper limit for the frequency reference has been exceeded.
A large load triggered Stall Prevention function during acceleration.
L3-01 = 4 [StallP Mode@Accel = ILim Mode] has been set.
The motor is rotating at this speed:
b2-01 [ZSpd/DCI Threshold] ≤ Motor Speed < E1-09 [Min Output
Frequency]
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The Motor Is Making an Audible Noise

Causes
100% of the rated output current of the drive was exceeded while operating
at low speeds.
264
Possible Solutions
• 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.
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.
Set b5-09 = 1 [PID Output Level Selection = Reverse output].
Possible Solutions
Do Auto-Tuning.
Do Auto-Tuning again.
Do Rotational Auto-Tuning.
Possible Solutions
• Increase the value set in b2-02 [DCI Braking Current].
• Increase the value set in b2-04 [DCInj Time@Stop].
Set b1-03 = 0 or 2 [Stopping Method Selection = Ramp->Stop, DC Inj->Stop].
Possible Solutions
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.
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
• Decrease the load.
• Adjust L3-02 [StallP Level@Accel].
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].
Set E1-09 < b2-01.
Possible Solutions
If the sound is coming from the motor, set L8-38 = 0 [Carrier Reduction Mode = Disabled].
SIEPCYEUOQ2V01A Q2V Technical Manual