7.10 Troubleshooting Without Fault Display
416 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
7.10 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 416
The Motor Does Not Rotate after You Enter a Run Command 417
The Motor Rotates in the Opposite Direction from the Run Command 418
The Motor Rotates in Only One Direction 418
The Motor Is Too Hot 418
The Correct Auto-Tuning Mode Is Not Available 419
The Motor Stalls during Acceleration or Accel/Decel Time Is Too Long 419
The Drive Frequency Reference Is Different than the Controller Frequency Reference Command 420
The Motor Is Not Stable When Using a PM Motor 420
There Is Too Much Motor Oscillation and the Rotation Is Irregular 420
Deceleration Takes Longer than Expected when You Enable Dynamic Braking 420
There Is Audible Noise from the Drive or Motor Cables when You Energize the Drive 421
The Ground Fault Circuit Interrupter (GFCI) Trips During Run 421
Motor Rotation Causes Unexpected Audible Noise from Connected Machinery 421
Motor Rotation Causes Oscillation or Hunting 422
PID Output Fault 422
The Starting Torque Is Not Sufficient 422
The Motor Rotates after You Shut Off Drive Output 422
The Output Frequency Is Lower Than the Frequency Reference 422
The Motor Is Making an Audible Noise 423
The Motor Will Not Restart after Power Loss 423
◆ 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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