What the 0x45 alarm means

Joint 3 reached its negative limit zone; the alarm clears automatically when the joint moves back out. Our engineers run into this alarm every week on Dobot Magician / MG400 / M1 / CR (DobotStudio) controllers, and a single on-site inspection usually identifies the problem.

Most common causes

  • Commanded move past the negative limit
  • Taught point at the limit
  • Offset pushing the axis to the end
  • Home reference error after service
Field note: In our repair stats the first cause has the highest hit rate, so confirm it first before digging further.

Step-by-step field fix

  1. Jog joint 3 back out of the zone to auto-clear
  2. Re-teach the offending points
  3. Check offset logic
  4. Verify the home reference
  5. Test at reduced speed
Safety first: For Dobot 0x45, 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 Jog joint 3 back out of the zone to auto-clear; the arm working envelope handling is not a DIY job.

How we diagnose motion alarms on site

Dobot 0x45 belongs to the motion & path family. On Dobot 0x45 the failing stage is joint-integrated drive modules (collaborative models dominate) on the Dobot controllers (CR / MG / Nova series companions) - the gap between command and execution: trajectory planning, joint limits, singularities, following error and mechanical resistance. We start reading Dobot 0x45 at DobotStudio / app alarm messages; error codes are hexadecimal with a 0x prefix.

The chain involved in Dobot 0x45 runs: program command -> trajectory planner -> joint targets -> servo execution -> actual position feedback -> deviation compare.

First check whether Dobot 0x45 only appears at one pose - A six-axis arm near wrist extension or near axis-5 zero has a Jacobian approaching singularity: tiny tool moves demand huge joint rates, and the controller either reports following error or the arm snaps through. When the report is alarms at one position and clean on another path, suspect the singular region first. The fix is not raising speed limits but routing around it: move the part, add an intermediate point, or pass the region in joint interpolation.

Field notes on this page cover Dobot 0x45 (Joint 3 Negative Limit Reached); written by the Henghuan repair team, updated 2026-10-01.

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Related Motion & Path alarms

0x20 — Inverse Kinematics Singularity 0x21 — Inverse Kinematics No Solution — Out of Workspace 0x22 — Inverse Kinematics Over Joint Limit 0x30 — Joint 1 Overspeed 0x31 — Joint 2 Overspeed 0x32 — Joint 3 Overspeed
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 FANUC · KUKA · ABB and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the Dobot 0x45 alarm mean?

Joint 3 reached its negative limit zone; the alarm clears automatically when the joint moves back out. Our engineers run into this alarm every week on Dobot Magician / MG400 / M1 / CR (DobotStudio) controllers, and a single on-site inspection usually identifies the problem. Dobot 0x45 sits in the motion & path family; on our work orders the highest-frequency trigger for this code is "Commanded move past the negative limit".

QCan I clear a Dobot 0x45 alarm myself?

Whether Dobot 0x45 clears on its own depends on the outcome of "Jog joint 3 back out of the zone to auto-clear". Finish the flow with "Test at reduced speed" to confirm Dobot 0x45 - do not skip it. If that step is clean, the second most frequent cause on Dobot 0x45 is "Taught point at the limit". After clearing Dobot 0x45, watch it for one shift. A second trip means stop and let an engineer arrive with the right test gear for the arm working envelope.

QFor motion alarms like Dobot 0x45, can you triage remotely first?

The commonest causes we see on Dobot 0x45 are "Commanded move past the negative limit, Taught point at the limit, Offset pushing the axis to the end", so we stock the van against those. For Dobot 0x45 specifically, we carry mechanical and configuration items: grease, limit switches, drag-chain segments, encoder cables and the parameter sheets for common reducers. For Dobot 0x45, motion alarms can often be narrowed remotely first, so an on-site visit is not always immediate. Before we roll, tell us what Dobot 0x45 shows on DobotStudio / app alarm messages; error codes are hexadecimal with a 0x prefix and what the machine was doing - phone or video triage is free.

This page on Dobot 0x45 was compiled from actual repair records of the Henghuan Robotics repair team. Alarm notes are our own summary for troubleshooting reference only and may vary with controller and software version — please consult Dobot documentation or contact us if in doubt. Henghuan is an independent service provider, not affiliated with or endorsed by Dobot.