368 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
6.10 Troubleshooting without Fault Display
6.10 Troubleshooting without Fault Display
This section describes troubleshooting problems that do not trip an alarm or fault.
The following symptoms indicate that the drive is not set correctly
for proper performance with the motor. Refer to
Motor Performance Fine-Tuning on page 326 for guidance on troubleshooting.
• Motor hunting and oscillation
• Poor motor torque
• Poor speed precision
• Poor motor torque and speed response
• Motor noise
Common Problems
Cannot Change Parameter Settings
Common Problems Page
Cannot Change Parameter Settings 368
Motor Does Not Rotate Properly after Pressing RUN Button or after Entering
External Run Command
Motor Does Not Rotate 369
Motor Rotates in the Opposite Direction from the Run Command 370
Motor Rotates in One Direction Only 370
Motor is Too Hot 370
Drive Does Not Allow Selection of Rotational Auto-Tuning 370
oPE02 Error Occurs When Lowering the Motor Rated Current Setting 370
Motor Stalls During Acceleration or With Large Loads 371
Drive Frequency Reference Differs from the Controller Frequency Reference Command 371
Excessive Motor Oscillation and Erratic Rotation 371
Deceleration Takes Longer Than Expected with Dynamic Braking Enabled 372
Load Falls When Brake is Applied (Hoist-Type Applications) 372
Noise From Drive or Motor Cables When the Drive is Powered On 372
Equipment for Residual Current Monitoring/Detection (RCM/RCD) Trips During
Run.
372
Connected Machinery Vibrates When Motor Rotates
Unexpected Noise from Connected Machinery 372
Oscillation or Hunting 372
PID Output Fault 373
Insufficient Starting Torque 373
Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection Braking) 373
Output Frequency is not as High as Frequency Reference 373
Buzzing Sound from Motor at 2 kHz 373
Unstable Motor Speed when Using PM or IPM 374
Motor Does Not Restart after Power Loss 374
Cause Possible Solutions
The drive is running the motor (i.e., the Run command is present).
• Stop the drive and switch over to the Programming Mode.
• Most parameters cannot be edited during run.
The Access Level is set to restrict access to parameter settings. • Set the Access Level to allow parameters to be edited (A1-01 = 2).
The operator is not in the Parameter Setup Mode (the screen will
display “PAr”).
• See what mode the operator is currently set for.
• Parameters cannot be edited when in the Setup Mode (“STUP”). Switch modes so that “PAr” appears on the screen.
Refer to The Drive and Programming Modes on page 103.
A multi-function contact input terminal is set to allow or restrict
parameter editing (H1-01 through H1-08 = 1B).
• When the terminal is open, parameters cannot be edited.
• Turn on the multi-function contact input set to 1B.
The wrong password was entered.
• If the password entered to A1-04 does not match the password saved to A1-05, then drive settings cannot be
changed.
• Reset the password.
If you cannot remember the password:
• Scroll to A1-04. Press the button and press at the same time. Parameter A1-05 will appear.
• Set a new password to parameter A1-05.
Undervoltage was detected.
• Check the drive input power voltage by looking at the DC bus voltage (U1-07).
• Check all main circuit wiring.
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