YASKAWA GA700 Series

Troubleshooting
7
7.10 Troubleshooting Without Fault Display
YASKAWA SIEPC71061705H GA700 Series Technical Manual 373
7.10 Troubleshooting Without Fault Display
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 373
The Motor Does Not Rotate after You Enter a Run Command 374
The Motor Rotates in the Opposite Direction from the Run Command 375
The Motor Rotates in Only One Direction 375
The Motor Is Too Hot 375
The Correct Auto-Tuning Mode Is Not Available 376
The Motor Stalls during Acceleration or Accel/Decel Time Is Too Long 376
The Drive Frequency Reference Is Different than the Controller Frequency Reference Command 377
The Motor Is Not Stable When Using a PM Motor 377
There Is Too Much Motor Oscillation and the Rotation Is Irregular 377
Deceleration Takes Longer than Expected when You Enable Dynamic Braking 377
The Load Falls When a Brake Is Applied 378
There Is Audible Noise from the Drive or Motor Cables when You Energize the Drive 378
The Ground Fault Circuit Interrupter (RCM/ RCD) Trips During Run 378
Motor Rotation Causes Unexpected Audible Noise from Connected Machinery 378
Motor Rotation Causes Oscillation or Hunting 379
PID Output Fault 379
The Starting Torque Is Not Sufficient 379
The Motor Rotates after You Shut Off Drive Output 379
The Output Frequency Is Lower Than the Frequency Reference 379
The Motor Is Making an Audible Noise 380
The Motor Will Not Restart after Power Loss 380
◆ 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.