FAQ: What are some of the potential causes of an A.80 Alarm?
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An A.80 (A80) alarm is most often caused by external noise injection into the position feedback system (encoder or encoder cable). For a Sigma I system, this alarm occurs when there is more than 2 counts drift between the actual and expected pulse count at the positive rise of the U-Phase Hall Feedback (amplifier expects count to increase by encoder resolution per motor commutation cycle). For a Sigma II system, this alarm occurs when there is more than 2 counts drift between the actual and expected pulse count at the positive rise of the C-Phase Pulse Feedback (amplifier expects count to increase by encoder resolution per motor revolution).
If the alarm is generated at power supply on, either the encoder is wired incorrectly or the servo amplifier should be replaced.
If the alarm is generated at run time, noise is most likely the cause, and the following should be checked:
1) If encoder cable distance is long, check to insure that the proper wire gauge is used according to manual spec.
2) Verify the encoder cable construction according to manual spec.
3) Check to insure the encoder cable is not pinched.
4*) Check to verify that the Amplifier is properly grounded to the panel field ground according to the manual spec (mounted to metal panel, and proper field ground wire used).
5*) Noise entry into the system can also be reduced by using a Ferrite Core on the encoder cable - ZCAT1325-0530A, EMI/RFI clamp filter by TDK, try one or more loops of encoder wire.
6) Check that the system is not subject to excessive vibration impact
*Most common fixes
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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