|Question:||What are some potential causes of an A.84 Alarm?|
|Answer:||An A.84 (A84) alarm is an encoder data error alarm. This alarm is valid for both absolute and incremental encoders, and its meaning depends on the type of encoder. |
Most common application issues that cause an A.84 alarm are:
- Excessive Mechanical Vibration
- Excessive Electrical Noise
If efforts to reduce the above causes do not eliminate the A.84 Alarm, Contact Yaskawa Technical Support for further assistance at 1-800-927-5292, then press 3 for Servo Products.
12 bit Absolute Encoder
This indicates that the absolute encoder data is abnormal. If this alarm appears at power on, the absolute encoder is malfunctioning and replacement may be necessary. If this alarm appears during motor operation, it could be caused by external electrical noise. In this case, check and correct wiring around the encoder (grounding of servo motor, separation of encoder and power cables, insertion of toroidal cores on cables, etc.) - to reduce noise.
This indicates that data in the encoder is abnormal. If this alarm appears either during operation or at power on (intermittently or static), most commonly system vibration should be examined. Excessive vibration (exceeding motor specifications) can cause high vibration forces at the cantilevered encoder end (G-forces generated by vibration cause an A.84 alarm if they exceed the motors rated spec). Remedies include: Decrease acceleration values, implement S-Curve acceleration, check the mounting face accuracy and alignment, check the coupling alignment. If alarm persists, permanent damage to encoder may have occurred and motor replacement may be required.
|Product:||SGDH Sigma II |
|Link to related files:|
SAFETY PRECAUTIONS AND INSTRUCTIONS FOR USE OF FAQ INFORMATION!
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 superceed 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.