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 fault ranks high in our Kawasaki E / F / C series (AS language) service records, and the first site inspection usually finds the source.

Most common causes

  • AVR (control power supply) voltage misadjusted
  • Failing AVR unit
  • Defective servo board
Field note: The first cause shows up most on real machines, so verify it before you go further.

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: For Kawasaki d1028, this alarm family involves the DC bus, which sits at several hundred volts and stays charged for minutes after power-off - touching terminals is a shock hazard. On site you may not carry out the first step yourself: Measure the 5 V test points on the power sequence board; adjust into the 5.05-5.15 V window. Beyond that it is the DC bus and power stage work - leave it to a professional. On Kawasaki d1028: checking incoming voltage at the disconnect and looking at breakers and fuses is fine to do yourself; opening the cabinet to touch bus terminals or pulling power modules needs a qualified electrician.

How we diagnose drive alarms on site

Kawasaki d1028 belongs to the drive & power stage family. On Kawasaki d1028 the failing stage is cabinet drive boards (1GA / 1FA class) and power-stage modules per axis on the E-Controller / D-Controller / F-Controller - the fault sits on the energy chain: mains input, rectification, DC bus, braking resistor, inverter power devices and the drive board. We start reading Kawasaki d1028 at the pendant ERROR HISTORY with AS error numbers (D / E / P prefixes).

The chain involved in Kawasaki d1028 runs: three-phase mains -> rectifier -> DC bus (bus capacitors) -> brake chopper / braking resistor -> inverter (IGBT) -> motor.

When Kawasaki d1028 fires, the site usually reports AVR (control power supply) voltage misadjusted first, but the real cause is often cooling: More than half of power-stage alarms are not a dead device but a device cooked by failed cooling. A stopped cabinet fan, a packed filter mat or a dusted air duct keeps IGBT junction temperature high: intermittent over-temperature first, hard fault days later. On these alarms we open the power module and look for cracked thermal paste and felted dust in the duct, then measure phase-to-phase output and insulation to frame. Swapping the module without cleaning the duct just buys the same failure again.

Field notes on this page cover Kawasaki d1028 (Servo Board DC Power Abnormal (Servo FPGA)); written by the Henghuan repair team, updated 2026-10-01.

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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
Same family: this code belongs to the Drive & power stage alarms family - the page collects all Drive & power stage-family codes we have handled, with the common inspection order and spares.
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. This fault ranks high in our Kawasaki E / F / C series (AS language) service records, and the first site inspection usually finds the source. Kawasaki d1028 sits in the drive & power stage family; on our work orders the highest-frequency trigger for this code is "AVR (control power supply) voltage misadjusted".

QCan I clear a Kawasaki d1028 alarm myself?

Whether Kawasaki d1028 clears on its own depends on the outcome of "Measure the 5 V test points on the power sequence board; adjust into the 5.05-5.15 V window". Finish the flow with "Record measured rail voltages in the maintenance log" to confirm Kawasaki d1028 - do not skip it. If that step is clean, the second most frequent cause on Kawasaki d1028 is "Failing AVR unit". If Kawasaki d1028 returns after two clears, or the checks point at AVR (control power supply) voltage misadjusted, stop the cell and call a professional robot repair engineer.

QFor drive/power alarms like Kawasaki d1028, what spares do you bring on site?

The commonest causes we see on Kawasaki d1028 are "AVR (control power supply) voltage misadjusted, Failing AVR unit, Defective servo board", so we stock the van against those. For Kawasaki d1028 specifically, we stock the van along the energy chain: braking resistors, bus capacitors, input fuses, drive-board supply parts and the common power modules for the brand. For Kawasaki d1028, drive alarms usually stop the whole line, so they sit at the front of our dispatch queue. Before we roll, tell us what Kawasaki d1028 shows on the pendant ERROR HISTORY with AS error numbers (D / E / P prefixes) and what the machine was doing - phone or video triage is free.

The content on Kawasaki d1028 was written by Henghuan Robotics service engineers from hands-on repair experience. Alarm descriptions are our own reference summary and may differ by controller or software version — defer to Kawasaki documentation, or contact us to confirm. Henghuan is an independent service provider with no affiliation or endorsement by Kawasaki.