Overtravel Alarm Codes

FANUC Overtravel (OT) Alarm Codes List

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Check out the list below for a list of OT alarm codes throwing errors in your CNC controls.

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Contact FANUC component experts at Tri Star CNC Services for further support with OT error alarm codes.

FANUC Overtravel (OT) Alarm Codes
Alarm Code	Message	Description
500	OVER TRAVEL : +n	Exceeded the n–th axis (axis 1–8) + side stored stroke check I. (Parameter No.1320 or 1326 NOTE)
501	OVER TRAVEL : –n	Exceeded the n–th axis (axis 1–8) – side stored stroke check I. (Parameter No.1321 or 1327 NOTE)
502	OVER TRAVEL : +n	Exceeded the n–th axis (axis 1–8) + side stored stroke check II. (Parameter No.1322 )
503	OVER TRAVEL : –n	Exceeded the n–th axis (axis 1–8) – side stored stroke check II. (Parameter No.1323)
504	OVER TRAVEL : +n	Exceeded the n–th axis (axis 1–8) + side stored stroke check III. (Parameter No.1324 )
505	OVER TRAVEL : –n	Exceeded the n–th axis (axis 1–8) – side stored stroke check III. (Parameter No.1325 )
506	OVER TRAVEL : +n	Exceeded the n–th axis (axis 1–8) + side hardware OT.
507	OVER TRAVEL : –n	Exceeded the n–th axis (axis 1–8) – 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	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.

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Overtravel Code Repair Use the description of the FANUC alarm code to guide your troubleshooting. If you’ve hit a dead end and need further support, please contact us and we’ll help you find the path to a solution.