Motor Rotation Causes Oscillation Or Hunting; Pid Output Fault; The Starting Torque Is Not Sufficient; The Motor Rotates After The Drive Output Is Shut Off - YASKAWA GA800 Maintenance & Troubleshooting

◆

Motor Rotation Causes Oscillation or Hunting

Causes
The frequency reference is assigned to an external source, and there is electrical
interference in the signal.
The cable between the drive and motor is too long.
The PID parameters are not sufficiently adjusted.
◆

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.
◆

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.
◆

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.
◆

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.
YASKAWA TOEPYAIGA8001B GA800 Drive Maintenance & Troubleshooting
2.10 Troubleshooting Without Fault Display
Possible Solutions
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].
• Do Auto-Tuning.
• Make the wiring as short as possible.
Adjust b5-xx [PID control].
Possible Solutions
• 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.
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.
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].
2
145