FaultResolve
Back to Search Directory
Search this section

Search Siemens SINUMERIK 840D CNC

Search other Siemens SINUMERIK 840D CNC alarms without going back to the model list.

Search all database

Code 25050: Axis %1 contour monitoring

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 contour monitoring alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.

Official Troubleshooting Steps

Parameters: %1 = Axis name, spindle number Definitions: The NCK calculates for each interpolat ion point (setpoint) of an axis the actual value that should result based on an internal model. If this calculated actual value and the true machine actual value differ by a larger amount than given in the MD36400 $MA_CO NTOUR_TOL, then the program is aborted and the alarm message is issued. The alarm can be reprogrammed in the MD11412 $MN_ALARM_REACTION_CHAN_NOREADY (channel not ready). Reaction: Mode group not ready. The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready. Remedy: Please inform the authorized personnel/service department. - Check whether the tolerance value set in MD36400 $MA_CONTOUR_TOL is too small. - Check optimization of the posit ion controller (Kv factor in the MD32200 $MA_POSCTRL_GAIN) to establish whether the axis follows the given setpoint without overshooting. Otherwise, the speed controller optimization must be improved or the Kv servo gain factor must be reduced. - Improvement of speed controller optimization - Check the mechanics (smooth running, inertial masses). Program Continuation: Clear alarm with the RESET key in all channel s of this mode group. Restart part program. Diagnostics Manual (DAsl), 03/2009

Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)

Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.

About Siemens SINUMERIK 840D CNC Alarms

Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 25050 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.

Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.

Have a better solution?

Help the industrial community by sharing your repair experience for code 25050.

Manual conversion service

Need a searchable reference for more Siemens SINUMERIK 840D CNC manuals?

We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.

Convert PDF fault-code charts and manuals into clean data.
Build public SEO pages or private internal search tools.
Prioritize updates around codes and manuals people search for.
Request manual conversion Email PDFs to manuals.errordb@gmail.com
Advertisement

Space reserved for Google AdSense / Industrial Affiliate Links

Monetization target for 2026

Related Siemens SINUMERIK 840D CNC Codes