What the A.510 alarm means

The servomotor speed exceeded the permitted maximum (about 1.1-1.2 x rated speed); the drive trips to prevent mechanical damage. 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

  • Motor power wiring U/V/W phase order swapped
  • Encoder wiring error or noise-corrupted encoder signal
  • Position/speed command input too large
  • Wrong command input gain setting
  • SERVOPACK board fault
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. Verify the U/V/W phase order at the motor connector — wrong phasing is the classic cause at first servo-on
  2. Inspect encoder cable routing; separate from power cables and check the shield grounding
  3. Review the motion command values and limits in the program
  4. Re-teach or re-limit the affected move and retest at low speed
  5. If the alarm returns at servo-on with correct wiring, replace the SERVOPACK
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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Related Motion & Path alarms

4733 — Singular Posture
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.510 alarm mean?

The servomotor speed exceeded the permitted maximum (about 1.1-1.2 x rated speed); the drive trips to prevent mechanical damage. In field practice it belongs to the motion & path family of faults.

QCan I clear a Yaskawa A.510 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.