Troubleshooting
2
2.10 Troubleshooting Without Fault Display
YASKAWA TOEPYAIGA8001B GA800 Drive Maintenance & Troubleshooting 139
2.10 Troubleshooting Without Fault Display
Note:
Make sure that you use a keypad that has a flash number of 1004 or later. Keypads that have a flash number of 1003 or earlier will not show
characters correctly.
If the drive or motor operate incorrectly, but the keypad does not show a fault or error code, refer to the items this
section.
• Motor hunting and oscillation
• Unsatisfactory motor torque
• Unsatisfactory speed precision
• Unsatisfactory motor torque and speed response
• Motor noise
◆ Typical Problems
Symptom Ref.
The Parameter Settings Will Not Change 139
The Motor Does Not Rotate after You Enter a Run Command 140
The Motor Rotates in the Opposite Direction from the Run Command 141
The Motor Rotates in Only One Direction 141
The Motor Is Too Hot 141
The Correct Auto-Tuning Mode Is Not Available 142
The Motor Stalls during Acceleration or Accel/Decel Time Is Too Long 142
The Drive Frequency Reference Is Different than the Controller Frequency Reference Command 143
The Motor Is Not Stable When Using a PM Motor 143
There Is Too Much Motor Oscillation and the Rotation Is Irregular 143
Deceleration Takes Longer than Expected when You Enable Dynamic Braking 143
There Is Audible Noise from the Drive or Motor Cables when You Energize the Drive 144
The Ground Fault Circuit Interrupter (GFCI) Trips During Run 144
Motor Rotation Causes Unexpected Audible Noise from Connected Machinery 144
Motor Rotation Causes Oscillation or Hunting 145
PID Output Fault 145
The Starting Torque Is Not Sufficient 145
The Motor Rotates after You Shut Off Drive Output 145
The Output Frequency Is Lower Than the Frequency Reference 145
The Motor Is Making an Audible Noise 146
The Motor Will Not Restart after Power Loss 146
◆ The Parameter Settings Will Not Change
Causes Possible Solutions
The drive is operating the motor (the drive is in Drive Mode). Stop the drive and change to Programming Mode.
Parameter A1-01 = 0 [Access Level Selection = Operation Only]. Set A1-01 = 2 [Access Level Selection = Advanced Level] or A1-01 = 3 [Expert Level].
Parameter H1-xx = 1B [MFDI Function Select = Programming Lockout]. Activate the terminals to which H1-xx = 1B is set, and then change the parameters.
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