Code 75653: [Channel %1: ] PROT: Collision protection stops axis %2
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] PROT: Collision protection stops axis %2 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 = Channel number %2 = Axis number Definitions: The axis collision protection func tion PROT has detected a risk of collision, and stopped the critical axes. Reaction: Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Retract axis in JOG. Modify part program if necessary. Program Continuation: Clear alarm with the RESET key. Restart part program HMI-Alarms Diagnostics Manual (DAsl), 03/2009 Parameters: %1 = -Definitions: -Remedy: --
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 75653 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.
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