YASKAWA A1000

6.10 Troubleshooting without Fault Display
374 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
 Unstable Motor Speed when Using PM
 Motor Does Not Restart after Power Loss
Cause Possible Solutions
The motor code for the PM motor (E5-01 or T2-02) is set
incorrectly (YASKAWA motors only).
Refer to Motor Performance Fine-Tuning on page 326 for details.
Drive is attempting to operate the motor beyond the speed control
range listed in the specifications.
Check the speed control range and adjust the speed accordingly.
Drive is attempting to operate the motor at 5% or less of the speed
reference value.
Use alternative motor if the drive is attempting to operate the motor at 5% or less of the speed reference value.
Motor hunting occurs. Refer to Motor Performance Fine-Tuning on page 326 for details.
Hunting occurs at start. Increase the S-curve time at the start of acceleration (C2-01).
Too much current is flowing through the drive.
• Enter the correct motor code for the PM motor being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test report provided for the
motor.
Cause Possible Solutions
The Run command was not issued again when power was restored.
• Check the sequence and wiring that has been set up to enter the Run command.
• A relay should be set up to make sure the Run command remains enabled throughout any power loss.
The relay that is supposed to maintain the Run command has been
switched off.
Check wiring and circuitry for the relay intended to keep the Run command enabled.