7.10 Troubleshooting Without Fault Display
362 YASKAWA SIEPC71061737B GA800 Drive Technical Reference
7.10 Troubleshooting Without Fault Display
Note:
Make sure that you use a keypad with FLASH number 1004 or later. Keypads with FLASH numbers 1003 and 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 Reference
The Parameter Settings Will Not Change 362
The Motor Does Not Rotate After Entering Run Command 363
The Motor Rotates in the Opposite Direction from the Run Command 364
The Motor Rotates in Only One Direction 364
The Motor Is Too Hot 364
The Correct Auto-Tuning Mode Is Not Available 365
The Motor Stalls during Acceleration or Accel/Decel Time Is Too Long 365
The Drive Frequency Reference Is Different than the Controller Frequency Reference Command 366
The Motor Speed Is Not Stable When Using a PM Motor 366
There Is Too Much Motor Oscillation and the Rotation Is Irregular 366
Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled 366
There Is Audible Noise from the Drive or Motor Cables When the Drive Is Energized 367
The Ground Fault Circuit Interrupter (GFCI) Trips During Run 367
Motor Rotation Causes Unexpected Audible Noise from Connected Machinery 367
Motor Rotation Causes Oscillation or Hunting 367
PID Output Fault 368
The Starting Torque Is Not Sufficient 368
The Motor Rotates after the Drive Output Is Shut Off 368
The Output Frequency Is Lower Than the Frequency Reference 368
The Motor Is Making an Audible Noise 369
The Motor Will Not Restart after a Loss of Power 369
◆ 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]. Turn ON the terminals to which H1-xx = 1B is set, and then change the parameters.
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