7.10 Troubleshooting Without Fault Display280 YASKAWA SIEPC71061753A GA500 Technical Manual7.10 Troubleshooting Without Fault DisplayIf the drive or motor operate incorrectly, but the keypad does not show a fault or error code, refer to the items thissection.• Motor hunting and oscillation• Unsatisfactory motor torque• Unsatisfactory speed precision• Unsatisfactory motor torque and speed response• Motor noise◆ Typical ProblemsSymptom ReferenceThe Parameter Settings Will Not Change 280The Motor Does Not Rotate After Entering Run Command 281The Motor Rotates in the Opposite Direction from the Run Command 282The Motor Rotates in Only One Direction 282The Motor Is Too Hot 282The Correct Auto-Tuning Mode Is Not Available 283The Motor Stalls during Acceleration or Accel/Decel Time Is Too Long 283The Drive Frequency Reference Is Different than the Controller Frequency Reference Command 284The Motor Speed Is Not Stable When Using a PM Motor 284There Is Too Much Motor Oscillation and the Rotation Is Irregular 284Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled 284The Load Falls When a Brake Is Applied 285There Is Audible Noise from the Drive or Motor Cables When the Drive Is Energized 285Residual Current Monitoring/Detection (RCM/RCD) Trips During Run 285Motor Rotation Causes Unexpected Audible Noise from Connected Machinery 285Motor Rotation Causes Oscillation or Hunting 285PID Output Fault 286The Starting Torque Is Not Sufficient 286The Motor Rotates after the Drive Output Is Shut Off 286The Output Frequency Is Lower Than the Frequency Reference 286The Motor Is Making an Audible Noise 286The Motor Will Not Restart after a Loss of Power 287◆ The Parameter Settings Will Not ChangeCauses Possible SolutionsThe 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.
