u
Unstable Motor Speed when Using PM
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 290 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.
Motor hunting occurs. Refer to Motor Performance Fine-Tuning on page 290 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.
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Motor Does Not Restart after Power Loss
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.
6.10 Troubleshooting without Fault Display
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
343
6
Troubleshooting
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