What the 1040 alarm means

The drive lost valid encoder feedback for the axis; servo control is impossible and the axis is disabled. This fault ranks high in our EFORT EC2-S controller + TSINO drives service records, and the first site inspection usually finds the source.

Most common causes

  • Encoder cable broken in the cable chain
  • Loose or oxidized encoder connectors
  • Noise corrupting the encoder signal
  • Encoder or drive interface hardware failure
Field note: The first cause shows up most on real machines, so verify it before you go further.

Step-by-step field fix

  1. Reseat encoder connectors at both ends
  2. Continuity-test the cable through full cable-chain travel
  3. Check shielding and separation from power cables
  4. Swap-test with a known-good cable
  5. Replace encoder (motor) or drive based on the result
Safety first: For EFORT 1040, encoder alarms often mean position data cannot be trusted: actual pose may disagree with the system record, so releasing a brake or jogging carries unexpected-motion risk. What you can check yourself first is Reseat encoder connectors at both ends; position feedback and brake release handling is not a DIY job.

How we diagnose encoder alarms on site

EFORT 1040 belongs to the encoder & position family. On EFORT 1040 the failing stage is absolute encoders with battery on the EFORT robot controller - the feedback path: encoder body, encoder cable, battery, measuring board and the stored position memory. We start reading EFORT 1040 at the pendant alarm list (four-digit codes, 1xxx / 3xxx / 4xxx segments).

The chain involved in EFORT 1040 runs: motor-side encoder -> encoder cable -> drive / measuring board acquisition -> position count and zero data -> battery-held memory.

If EFORT 1040 shows Encoder cable broken in the cable chain and tracks arm pose, the hard case arrives: Encoder cables flexing in a drag chain fatigue their copper cores: open at one pose, conducting at another. This is the nastiest to reproduce because it is intermittent. We jog the suspect axis near the pose recorded at alarm time and measure continuity while moving, watching the feedback for jumps. If the cable in that chain is past its rated bend count, we recommend replacing the whole run rather than splicing, even when this repair holds.

Field notes on this page cover EFORT 1040 (Encoder Feedback Fault (TSINO)); written by the Henghuan repair team, updated 2026-10-01.

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

Send the alarm code, the robot model and a description of what was happening at the alarm. Our engineers handle EFORT 1040 every day, and remote diagnosis by phone/video is free.

Get a Free Remote Diagnosis See Repair Services

Hotline: +86-20-39029800 · WhatsApp: +86-188-1886-2860

Related Encoder & Position alarms

1001 — Drive Overcurrent (TSINO Servo) 1010 — Drive DC Bus Overvoltage (TSINO) 1011 — Drive DC Bus Undervoltage (TSINO) 1020 — Motor Overload (TSINO) 1030 — Drive Overtemperature (TSINO) 1801 — Safety Circuit Major Fault (EC2-S)
Same family: this code belongs to the Encoder & position alarms family - the page collects all Encoder & position-family codes we have handled, with the common inspection order and spares.
Other brands: we also keep field-fix libraries for JAKA · AUBO · ROKAE and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the EFORT 1040 alarm mean?

The drive lost valid encoder feedback for the axis; servo control is impossible and the axis is disabled. This fault ranks high in our EFORT EC2-S controller + TSINO drives service records, and the first site inspection usually finds the source. EFORT 1040 sits in the encoder & position family; on our work orders the highest-frequency trigger for this code is "Encoder cable broken in the cable chain".

QCan I clear a EFORT 1040 alarm myself?

Whether EFORT 1040 clears on its own depends on the outcome of "Reseat encoder connectors at both ends". Finish the flow with "Replace encoder (motor) or drive based on the result" to confirm EFORT 1040 - do not skip it. If that step is clean, the second most frequent cause on EFORT 1040 is "Loose or oxidized encoder connectors". Two attempts and still there means stop: EFORT 1040 involves position feedback and brake release, and running EFORT 1040 on can turn a repairable fault into a replacement.

QFor encoder alarms like EFORT 1040, can it be fixed in one visit?

The commonest causes we see on EFORT 1040 are "Encoder cable broken in the cable chain, Loose or oxidized encoder connectors, Noise corrupting the encoder signal", so we stock the van against those. For EFORT 1040 specifically, we carry feedback-path parts: encoder cables, battery packs, connector pins and the measuring-board type data for the brand. For EFORT 1040, encoder alarms are mostly broken cores and dead batteries, both of which ride in the van, so most clear in one visit. Before we roll, tell us what EFORT 1040 shows on the pendant alarm list (four-digit codes, 1xxx / 3xxx / 4xxx segments) and what the machine was doing - phone or video triage is free.

The notes on EFORT 1040 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 EFORT documentation or contact us with questions. Henghuan is an independent service provider, not affiliated with or endorsed by EFORT.