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11.3.8. Alarm A7: Resolver Amplifier Alarm
This alarm occurs when an excessive current is applied to the position sensor (Absolute position
sensor or incremental position sensor) or an abnormal increase in heat is occurring to the drive
element.
Table 11-15: Cause and remedy for the alarm A7
Cause Remedy
(1) Defective resolver cable.
(2) Defective resolver winding.
• Visually check the cable coating for damage.
• Follow “Appendix 2: How to Check Motor Condition” and replace
the cable or the Motor if necessary.
(3)
Defective Driver Unit.
• If above procedure does not work, the Driver Unit may be
defective. Replace it referring to “Appendix 4: Procedure for
Replacing the EDC Driver Unit”.
(1) Refer to “11.3.2. Alarm A0: Disconnected Sensor Cable” for precautions for the wiring of
resolver cables.
11.3.9. Alarm A9: Commutation Error
The Driver Unit checks if the Motor operates normally at the moment of the first servo activation
after the power is turned on.
This alarm occurs when the Motor moves exceeding ± 15° (angle degree) at this moment.
Table 11-16: Cause and Remedy for the Alarm A9
Cause Remedy
(1)
Unmatched combination of Motor
and Driver Unit.
• Check for proper combination
(2)
The Motor moves when the servo is
turned on because of external force.
• Remove the cause of external force.
• Refer to “5. Tuning” if the Motor is affected by the gravity because
its axis is horizontal.
(3) Defective cable, Motor or Driver Unit.
• Follow “Appendix 2: How to Check Motor Condition” for
checking their conditions. Replace the cable or the Motor if
necessary.
• If above procedures do not work, the Driver Unit nay be defective.
Replace it referring to “Appendix 4: Procedure for Replacing the
EDC Driver Unit.”
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