During machine operation, if the motion exceeds the travel limits set in the FANUC system, an Over Travel Alarm will be triggered.
These alarms serve to protect the machine from mechanical damage due to excessive travel or axis interference.
This article summarizes the common Over Travel alarms (No. 500–515) and their troubleshooting methods.
Common Overtravel Alarm Classification
Below are the common FANUC Over Travel alarm codes and their meanings.
| Alarm No. | Content | Description |
|---|---|---|
| 500 | OVER TRAVEL : +n | Exceeded the n–th axis + side stored stroke check I. (Parameter No.1320 or 1326) |
| 501 | 1 OVER TRAVEL : –n | Exceeded the n–th axis – side stored stroke check I. (Parameter No.1321 or 1327 NOTE) |
| 502 | OVER TRAVEL : +n | Exceeded the n–th axis + side stored stroke check II. (Parameter No.1322 ) |
| 503 | OVER TRAVEL : –n | Exceeded the n–th axis – side stored stroke check II. (Parameter No.1323) |
| 504 | OVER TRAVEL : +n | Exceeded the n–th axis + side stored stroke check III. (Parameter No.1324 ) |
| 505 | OVER TRAVEL : –n | Exceeded the n–th axis – side stored stroke check III. (Parameter No.1325 ) |
| 506 | OVER TRAVEL : +n | Exceeded the n–th axis + side hardware OT. |
| 507 | OVER TRAVEL : –n | Exceeded the n–th axis – side hardware OT. |
| 508 | INTERFERENCE: +n (T series (two–path control)) |
A tool moving in the positive direction along the n axis has fouled another tool post. |
| 509 | INTERFERENCE: –n (T series (two–path control)) |
A tool moving in the negative direction along the n axis has fouled another tool post. |
| 510 | 0 OVER TRAVEL: +n | Alarm for stroke check prior to movement. The end point specified in a block falls within the forbidden area defined with the stroke check in the positive direction along the N axis. Correct the program. |
| 511 | OVER TRAVEL: –n | Alarm for stroke check prior to movement. The end point specified in a block falls within the forbidden area defined with the stroke check in the negative direction along the N axis. Correct the program. |
| 514 | INTERFERENCE : +n |
The rotation area interference check function found interference on the plus side of the n axis. |
| 515 | INTERFERENCE : –n | The rotation area interference check function found interference on the minus side of the n axis. |
NOTE:
- Alarms 506 and 507 are specific to T-series machines.
- Parameters 1326 and 1327 are effective when EXLM (stroke check switch signal) is ON.
References:
《FANUC Series 0 - MODEL C MAINTENANCE MANUAL》, Publication No. B-64115EN/03
Other Articles
Related Articles
Here are some related technical resources you may also find helpful:
- Common FANUC CNC Alarms Classification
- FANUC G/ M Code for a Machining Center
- FANUC G/ M Code for lathe
- How to backup SRAM file
- How to backup All data
- How to Solve FANUC alarm 5523/5524
Technical Categories
Browse our full set of technical resources:
-
Common FANUC Alarms
-
G & M Code Reference
-
Technical Guides (Backup, Parameters, Settings)
- Repair Cases & Troubleshooting Examples
Back to Previous Page
Click here to return to the previous category page.
Back to Technical Support Home
Return to the Technical Support main page to explore all resources.
