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 - YASKAWA CIPR-GA50C 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 = 3 [Stall Prevent Select duringAccel = ILim Mode] has been set.
The motor is rotating at this speed:
b2-01 [DC Injection/Zero SpeedThreshold] ≤ Motor Speed < E1-09
[Minimum 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.
286
Possible Solutions
• 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 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.
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.
Set b5-09 = 1 [PID Output Level Selection = Reverse output (reverse acting)].
Possible Solutions
Do Auto-Tuning.
Do Auto-Tuning again.
Do Rotational Auto-Tuning.
Possible Solutions
• Increase the value set in b2-02 [DC Injection Braking Current].
• Increase the value set in b2-04 [DC Inject Braking Time at Stop].
Set b1-03 = 0 or 2 [Stopping Method Selection = Ramp to Stop, DC Injection Braking to Stop].
Possible Solutions
Adjust d3-01 to d3-03 [Jump Frequency 1 to 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 [Maximum Output Frequency] and d2-01 [Frequency Reference 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 [Stall Prevent Level during 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 = 1 [Enabled].
Set E1-09 < b2-01.
Possible Solutions
If the sound is coming from the motor, set L8-38 = 0 [Carrier Frequency Reduction = Disabled].
YASKAWA SIEPC71061753A GA500 Technical Manual