What the A.810 alarm means

Both the encoder supply and the battery supply failed, so absolute position data was lost; the axis must be re-referenced (zeroing) before use. This is one of the faults our repair team handles on Yaskawa DX100 / DX200 / YRC1000 systems — the cause is usually identifiable within the first on-site inspection.

Most common causes

  • Dead or missing encoder backup battery
  • Battery connector loose or corroded
  • Power removed while encoder supply was already down
  • Absolute encoder itself faulty
Field note: the first item on this list is what we find most often on real machines. Check it before you go deeper.

Step-by-step field fix

  1. Replace the encoder backup battery with a fresh one
  2. Inspect the battery holder and connector
  3. Run the absolute-encoder setup/zeroing procedure on the affected axis
  4. Move each axis to its mechanical scribe mark and verify the zero values
  5. Replace the encoder/motor if the alarm returns after setup
Safety first: never bypass safety circuits or force contactors closed. If the alarm involves E-stop chains, brakes or drive power, and you are not a trained robot technician, contact a professional — wrong moves here can cost you a robot or an injury.

Still stuck? Get an engineer on the phone — right now

Tell us the alarm code, the robot model and what was happening when the alarm came up. Our engineers run these diagnostics every day, and remote diagnosis by phone or video call is free.

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Hotline: +86-20-39029800 · WhatsApp: +86-188-1886-2860

Related Encoder & Position alarms

A.830 — Absolute Encoder Battery Error A.C90 — Encoder Communications Error
Other brands: we also keep field-fix libraries for Universal Robots · Kawasaki · Staubli and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the Yaskawa A.810 alarm mean?

Both the encoder supply and the battery supply failed, so absolute position data was lost; the axis must be re-referenced (zeroing) before use. In field practice it belongs to the encoder & position family of faults.

QCan I clear a Yaskawa A.810 alarm myself?

Sometimes. Work through the step-by-step checks on this page — the first listed cause is what we find most often in the field. If the alarm returns after two attempts, or the fault involves power, brakes or safety circuits, stop and call a qualified robot service engineer.

QHow fast can a Henghuan engineer help?

On-site response in the Pearl River Delta within 30 minutes to 3 hours, across mainland China in 1-3 business days, and worldwide within 2-5 business days. Remote diagnosis by phone/WhatsApp/video is available immediately.

Written by the Henghuan Robotics repair team from field service experience. Alarm descriptions are our own summary for troubleshooting reference and may vary by controller and software version — when in doubt, check your Yaskawa documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by Yaskawa.