7.10 Troubleshooting Without Fault Display
298 YASKAWA SIEPC71061753C GA500 Technical Manual
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 Reference
The Parameter Settings Will Not Change 298
The Motor Does Not Rotate after You Enter a Run Command 299
The Motor Rotates in the Opposite Direction from the Run Command 299
The Motor Rotates in Only One Direction 300
The Motor Is Too Hot 300
The Correct Auto-Tuning Mode Is Not Available 300
The Motor Stalls during Acceleration or Accel/Decel Time Is Too Long 300
The Drive Frequency Reference Is Different than the Controller Frequency Reference Command 301
PM Motor Speed Is Not Stable 301
There Is Too Much Motor Oscillation and the Rotation Is Irregular 302
Deceleration Takes Longer than Expected when You Enable Dynamic Braking 302
The Load Falls When a Brake Is Applied 302
There Is Audible Noise from the Drive or Motor Cables when You Energize the Drive 302
Residual Current Monitoring/Detection (RCM/RCD) Trips During Run 303
Motor Rotation Causes Unexpected Audible Noise from Connected Machinery 303
Motor Rotation Causes Oscillation or Hunting 303
PID Output Fault 303
The Starting Torque Is Not Sufficient 303
The Motor Rotates after You Shut Off Drive Output 304
The Output Frequency Is Lower Than the Frequency Reference 304
The Motor Will Not Restart after Power Loss 304
◆ 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.
You entered an incorrect password in A1-04 [Password]. • Enter the correct password to A1-04 again.
• If you forgot the password, set the password again with A1-04 and A1-05 [Password Setting].
Note:
If you set the password, you cannot change these parameters until the password aligns:
• A1-01 [Access Level Selection]
• A1-02 [Control Method Selection]
• A1-03 [Initialize Parameters]
• A1-06 [Application Preset]
• A1-07 [DriveWorksEZ Function Selection]
• A2-01 to A2-32 [User Parameter 1 to User Parameter 32]
The drive detected Uv [Undervoltage]. • View U1-07 [DC Bus Voltage] to see the power supply voltage.
• Examine the main circuit wiring.
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