What the SRVO-005 alarm means

An axis hit its overtravel limit switch - the hardware stop beyond the software limit. We fix this FANUC R-30iA / R-30iB / R-30iB Plus fault almost daily, and one round of on-site checks usually confirms what is going on.

Most common causes

  • Axis jogged or driven past software limits (often after mastering loss)
  • Overtravel switch or wiring fault
Field note: We have tallied real cases: the first cause tops the list, so start your diagnosis there.

Step-by-step field fix

  1. Use the overtravel release procedure to move the axis back inside limits
  2. Verify mastering afterwards - OT events often follow bad mastering
  3. Test the OT switch and wiring if it triggers without real overtravel
Safety first: For FANUC srvo-005, this alarm is the safety circuit itself: jumpering a door switch or forcing a contactor removes the protection entirely - no protective action when something happens, and no defensible account of responsibility. What you can check yourself first is Use the overtravel release procedure to move the axis back inside limits; the e-stop chain and safety circuit handling is not a DIY job.

How we diagnose safety-chain faults on site

FANUC srvo-005 belongs to the safety chain & e-stop family. On FANUC srvo-005 the failing stage is Dual Check Safety (e-stop board plus dual-channel safety circuit) on the R-30iB Plus / R-30iB Mate Plus / R-30iA - continuity of one series loop: e-stop buttons, door switches, light curtains, safety relays and the enabling device. We start reading FANUC srvo-005 at the iPendant ALARM screen (SRVO / MOTN / SYST / INTF prefixes) together with the amplifier's 7-segment status code.

The chain involved in FANUC srvo-005 runs: e-stop / door / curtain -> safety relay (dual channel) -> controller safety input -> motor-off and brake apply.

On FANUC srvo-005 (field clue usually Axis jogged or driven past software limits (often after mastering loss)) we have one hard rule: On this family we have a hard rule: no bypassing the safety loop, no forcing contactors closed, ever. Some sites jumper the door switch to keep running - that removes the entire protection function, and when something happens there is no protective action and no defensible account of responsibility. We have seen a crush injury caused by exactly that jumper, so we would rather wait for parts than do it. If a customer has already jumpered it, we restore the circuit first and then diagnose the real fault.

Field notes on this page cover FANUC srvo-005 (Robot Overtravel); written by the Henghuan repair team, updated 2026-10-01.

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

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Related Safety Chain & E-Stop alarms

SRVO-105 — Door Open or E.Stop SRVO-201 — Panel E-Stop SRVO-202 — TP E-Stop SRVO-204 — External E-Stop (SVEMG Abnormal) SRVO-230 — Chain 1 (+24V) Abnormal SRVO-231 — Chain 2 (0V) Abnormal
Same family: this code belongs to the Safety chain & e-stop alarms family - the page collects all Safety chain & e-stop-family codes we have handled, with the common inspection order and spares.
Other brands: see our KUKA, ABB, Yaskawa and Universal Robots field-fix libraries — or the full 10-brand hub.

Frequently asked questions

QWhat does the FANUC srvo-005 alarm mean?

An axis hit its overtravel limit switch - the hardware stop beyond the software limit. We fix this FANUC R-30iA / R-30iB / R-30iB Plus fault almost daily, and one round of on-site checks usually confirms what is going on. FANUC srvo-005 sits in the safety chain & e-stop family; on our work orders the highest-frequency trigger for this code is "Axis jogged or driven past software limits (often after mastering loss)".

QCan I clear a FANUC srvo-005 alarm myself?

Whether FANUC srvo-005 clears on its own depends on the outcome of "Use the overtravel release procedure to move the axis back inside limits". Finish the flow with "Test the OT switch and wiring if it triggers without real overtravel" to confirm FANUC srvo-005 - do not skip it. If that step is clean, the second most frequent cause on FANUC srvo-005 is "Overtravel switch or wiring fault". Two attempts and still there means stop: FANUC srvo-005 involves the e-stop chain and safety circuit, and running FANUC srvo-005 on can turn a repairable fault into a replacement.

QA safety-chain fault like FANUC srvo-005 stops the line - how fast can you be here?

The commonest causes we see on FANUC srvo-005 are "Axis jogged or driven past software limits (often after mastering loss), Overtravel switch or wiring fault", so we stock the van against those. For FANUC srvo-005 specifically, we stock along the loop: safety relays, common door switches, e-stop buttons, light-curtain pairs and terminal blocks. For FANUC srvo-005, a safety-chain fault stops the whole line, so we rank it top priority and pre-triage by phone: door switch, e-stop or relay. Before we roll, tell us what FANUC srvo-005 shows on the iPendant ALARM screen (SRVO / MOTN / SYST / INTF prefixes) together with the amplifier's 7-segment status code and what the machine was doing - phone or video triage is free.

The notes on FANUC srvo-005 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 FANUC documentation or contact us with questions. Henghuan is an independent service provider, not affiliated with or endorsed by FANUC.