Unstable Motor Speed When Using Pm; Motor Does Not Restart After Power Loss - YASKAWA E1000 Technical Manual

6.10 Troubleshooting without Fault Display

◆ Unstable Motor Speed when Using PM

Cause
The motor code for the PM motor (E5-01 or T2-02) is set
incorrectly (Yaskawa motors only).
Drive is attempting to operate the motor beyond the speed control
range listed in the specifications.
Motor hunting occurs.
Hunting occurs at start.
Too much current is flowing through the drive.

◆ Motor Does Not Restart after Power Loss

Cause
The Run command was not issued again when power was restored.
The relay that is supposed to maintain the Run command has been
switched off.
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Refer to Motor Performance Fine-Tuning on page 258
Check the speed control range and adjust the speed accordingly.
Refer to Motor Performance Fine-Tuning on page 258
Increase the S-curve time at the start of acceleration (C2-01).
• 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.
• 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.
Check wiring and circuitry for the relay intended to keep the Run command enabled.
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
Possible Solutions
for details.
for details.
Possible Solutions