What the 4498 alarm means

The requested operation refers to a control group (robot/station/base) that is not defined or not selected, so teaching or motion cannot proceed. In our Yaskawa service archive this alarm on DX100 / DX200 / YRC1000 systems shows up constantly, and the first on-site inspection almost always locates it.

Most common causes

  • Control group parameter (e.g. AxP group settings) misconfigured
  • Job references a group that does not exist on this controller
  • CMOS data corrupted after a power event
  • Wrong controller software version loaded for the hardware
Field note: The first cause is the most common in the field — check it first, then work through the rest.

Step-by-step field fix

  1. Check and reselect the control group on the pendant
  2. Verify the group definition in the setup parameters
  3. Compare with a known-good job from backup
  4. Save CMOS.BIN, then restore from the last good backup if data is corrupted
  5. Contact a qualified engineer if the group table itself is damaged
Safety first: For YASKAWA 4498, the risk on this family is not injury but data: lose the program, parameters and calibration data and weeks of teaching work start over. On site you may carry out the first step yourself: Check and reselect the control group on the pendant. Beyond that it is program and calibration data work - leave it to a professional.

How we diagnose system alarms on site

YASKAWA 4498 belongs to the system & program family. On YASKAWA 4498 the failing stage is INFORM language environment (DX100 / DX200 / YRC1000 / YRC1000micro) on the DX100 / DX200 / YRC1000 / YRC1000micro - the software layer: corrupted program or parameter files, boot failures, version mismatch, memory and storage media. We start reading YASKAWA 4498 at the pendant alarm list (A / E / 4xxx segments) together with the servo drive's digit display.

The chain involved in YASKAWA 4498 runs: storage media (CF / flash / disk) -> system software and firmware -> parameters and calibration data -> user programs -> runtime.

YASKAWA 4498 is a system-family alarm, and our iron rule is: On system alarms we have an iron rule: however urgent the customer is, we take a complete backup first - programs, parameters, calibration data, tool and work-object frames, all of it. The reason is arithmetic: losing the live state here usually means weeks of teaching done again, which costs far more than a few hours of downtime. Only after the backup do we decide restart, restore or reinstall. If the storage media is already throwing errors we pull the data read-only first.

Field notes on this page cover YASKAWA 4498 (No Control Group); written by the Henghuan repair team, updated 2026-10-01.

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Related System & Program alarms

A.100 — Overcurrent or Heat Sink Overheated (SERVOPACK) A.320 — Regenerative Overload A.400 — Overvoltage — Main Circuit DC Voltage Too High A.410 — Undervoltage — Main Circuit DC Voltage Too Low A.510 — Overspeed A.710 — Overload — High Load (Stall-level Torque)
Same family: this code belongs to the System & program alarms family - the page collects all System & program-family codes we have handled, with the common inspection order and spares.
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 4498 alarm mean?

The requested operation refers to a control group (robot/station/base) that is not defined or not selected, so teaching or motion cannot proceed. In our Yaskawa service archive this alarm on DX100 / DX200 / YRC1000 systems shows up constantly, and the first on-site inspection almost always locates it. YASKAWA 4498 sits in the system & program family; on our work orders the highest-frequency trigger for this code is "Control group parameter (e.g. AxP group settings) misconfigured".

QCan I clear a YASKAWA 4498 alarm myself?

Whether YASKAWA 4498 clears on its own depends on the outcome of "Check and reselect the control group on the pendant". Finish the flow with "Contact a qualified engineer if the group table itself is damaged" to confirm YASKAWA 4498 - do not skip it. If that step is clean, the second most frequent cause on YASKAWA 4498 is "Job references a group that does not exist on this controller". Do not chase takt through a repeating YASKAWA 4498. Left alone, system & program faults tend to graduate from repairable to must-replace.

QWhen you handle YASKAWA 4498, will my programs and frames get lost?

The commonest causes we see on YASKAWA 4498 are "Control group parameter (e.g. AxP group settings) misconfigured, Job references a group that does not exist on this controller, CMOS data corrupted after a power event", so we stock the van against those. For YASKAWA 4498 specifically, we carry recovery media and common storage media, but on this family the backup matters more than the spare. For YASKAWA 4498, on system alarms the first move is backup; we can walk the customer through preserving data remotely before anything else. Before we roll, tell us what YASKAWA 4498 shows on the pendant alarm list (A / E / 4xxx segments) together with the servo drive's digit display and what the machine was doing - phone or video triage is free.

The notes on YASKAWA 4498 were summarized by the Henghuan Robotics repair team from on-site service. The alarm interpretation is our empirical summary for troubleshooting reference and may vary by controller and software version — please check Yaskawa documentation or contact us with questions. Henghuan is an independent service provider, not affiliated with or endorsed by Yaskawa.