What the E0025 alarm means

The controller detected a sudden jump in axis position feedback — typically an encoder or feedback glitch. This fault ranks high in our Nachi AW / FD series service records, and the first site inspection usually finds the source.

Most common causes

  • Encoder signal noise or intermittent connection
  • Failing encoder
  • Loose encoder connector
  • Electromagnetic interference
Field note: The first cause shows up most on real machines, so verify it before you go further.

Step-by-step field fix

  1. Check the encoder connector seating
  2. Inspect encoder cable shielding and routing
  3. Look for new sources of electrical noise
  4. Swap-test the encoder
  5. Replace the encoder if jumps recur
Safety first: For NACHI e0025, this alarm family points at arm motion control: after a reset the arm can move unexpectedly, and anyone inside the working envelope is at strike and pinch risk. What you can check yourself first is Check the encoder connector seating; the arm working envelope handling is not a DIY job.

How we diagnose motion alarms on site

NACHI e0025 belongs to the motion & path family. On NACHI e0025 the failing stage is servo amplifier modules in the cabinet, assigned per axis on the AX-series / FD-series controllers - the gap between command and execution: trajectory planning, joint limits, singularities, following error and mechanical resistance. We start reading NACHI e0025 at the pendant error-code screen (E-series codes) with amplifier panel indicators.

The chain involved in NACHI e0025 runs: program command -> trajectory planner -> joint targets -> servo execution -> actual position feedback -> deviation compare.

The clearest field clue for NACHI e0025 is Encoder signal noise or intermittent connection; the discriminator is this test: The most valuable judgement on motion alarms is separating software from mechanics. We take the fixture off and re-run the same path below 10% speed: if it is clean unloaded and slow, the problem is mechanical - over-heavy tooling, shifted centre of gravity, or a joint that already has drag; if it alarms even unloaded and slow, look at program points, frame calibration and whether the path crosses a singular region. No instruments needed, and it removes half the wrong turns.

Field notes on this page cover NACHI e0025 (Position Jump (Jump Position)); written by the Henghuan repair team, updated 2026-10-01.

If you can't fix it, reach our engineers directly

Tell us these three: alarm code, robot model, and the operating condition at the alarm. NACHI e0025 NACHI e0025 is a diagnosis our engineers do daily, and phone/video remote diagnosis is free.

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Related Motion & Path alarms

E0012 — Robot Cannot Reach Recorded Point E0021 — Servo Follow-Up Error (Following Error) E0022 — Deviation Error
Same family: this code belongs to the Motion & path alarms family - the page collects all Motion & path-family codes we have handled, with the common inspection order and spares.
Other brands: we also keep field-fix libraries for Omron · ESTUN · INOVANCE and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the NACHI e0025 alarm mean?

The controller detected a sudden jump in axis position feedback — typically an encoder or feedback glitch. This fault ranks high in our Nachi AW / FD series service records, and the first site inspection usually finds the source. NACHI e0025 sits in the motion & path family; on our work orders the highest-frequency trigger for this code is "Encoder signal noise or intermittent connection".

QCan I clear a NACHI e0025 alarm myself?

Whether NACHI e0025 clears on its own depends on the outcome of "Check the encoder connector seating". Finish the flow with "Replace the encoder if jumps recur" to confirm NACHI e0025 - do not skip it. If that step is clean, the second most frequent cause on NACHI e0025 is "Failing encoder". When NACHI e0025 keeps coming back it is not a one-off trigger - especially if Replace the encoder if jumps recur is where you get stuck. Do not keep producing through NACHI e0025.

QFor motion alarms like NACHI e0025, can you triage remotely first?

The commonest causes we see on NACHI e0025 are "Encoder signal noise or intermittent connection, Failing encoder, Loose encoder connector", so we stock the van against those. For NACHI e0025 specifically, we carry mechanical and configuration items: grease, limit switches, drag-chain segments, encoder cables and the parameter sheets for common reducers. For NACHI e0025, motion alarms can often be narrowed remotely first, so an on-site visit is not always immediate. Before we roll, tell us what NACHI e0025 shows on the pendant error-code screen (E-series codes) with amplifier panel indicators and what the machine was doing - phone or video triage is free.

The notes on NACHI e0025 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 Nachi documentation or contact us with questions. Henghuan is an independent service provider, not affiliated with or endorsed by Nachi.