In brief: A servo electric cylinder overtravel alarm means the controller or limit circuit detected travel beyond an allowed boundary. Record the code and machine state before resetting.
servo electric cylinder overtravel alarm: engineering checks
Use the application drawing, motion profile and exact component manuals. Record the operating baseline before changing settings so that a correction can be verified under the same load and cycle.
Confirm the commanded target
Compare target position with the configured soft limits and tooling envelope. A changed recipe or incorrect coordinate offset can request travel outside the safe range. Review the program change history.
Check homing and feedback
A missed home sensor, altered datum or encoder fault can make the displayed position differ from the real rod position. Verify the reference point and sensor state under the machine procedure. Do not jog toward a physical stop to prove a hypothesis.
Allow for stopping distance
Deceleration and load inertia determine where the axis actually stops after a command. A limit set too close to a hard stop may trip during normal braking. Change limits only after reviewing the machine envelope and safety design.
Inspect mechanics and retest
Binding, a loose coupling or a shifted sensor can also trigger a travel fault. Inspect with energy isolated. After correction, perform a reduced-speed full-stroke test, record position traces and confirm protective functions.
What to document
- Actuator, motor and drive models, payload, stroke, orientation and duty cycle.
- Alarm code, current, command and actual position at the first symptom.
- Mechanical alignment, external guidance, travel limits and safety response.
- One controlled change and a repeat test under the full production cycle.
Frequently asked question
Can I use one force or accuracy value for every model? No. Ratings depend on screw, motor, drive, mounting and duty. Ask for the datasheet and a review of the actual load case.
For adjacent topics, see the NEFEIT resource center, selection guide and failure diagnosis. Contact NEFEIT engineering with your drawing and trace data. For general guidance on linear motion components, consult THK technical resources alongside the actual component manuals.