What the D1028 alarm means

A DC supply rail on the servo board drifted out of rated range. When this appears together with D1562/E1294/E1300, fix D1028 first — the others usually clear with it. This is one of the faults our repair team handles on Kawasaki E / F / C series (AS language) systems — the cause is usually identifiable within the first on-site inspection.

Most common causes

  • AVR (control power supply) voltage misadjusted
  • Failing AVR unit
  • Defective servo board
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. Measure the 5 V test points on the power sequence board; adjust into the 5.05-5.15 V window
  2. If adjustment does not hold, replace the AVR
  3. If the rail is still wrong with a good AVR, replace the servo board
  4. Power-cycle and re-check all related DC alarms
  5. Record measured rail voltages in the maintenance log
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 Drive & Power Stage alarms

E1028 — Motor Overload (Axis XX) D1562 — Power Sequence Board — AC External Voltage Too High E1294 — Servo Board IO 24V Dropped
Other brands: we also keep field-fix libraries for Staubli · Epson · Nachi and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the Kawasaki D1028 alarm mean?

A DC supply rail on the servo board drifted out of rated range. When this appears together with D1562/E1294/E1300, fix D1028 first — the others usually clear with it. In field practice it belongs to the drive & power stage family of faults.

QCan I clear a Kawasaki D1028 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 Kawasaki documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by Kawasaki.