Code 177: ILLEGAL COMMD TIME CONST. CHANGE
Issue Description & Safety Warning
The Mazak Mazatrol Matrix CNC has triggered a critical ILLEGAL COMMD TIME CONST. CHANGE 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
Type of error: B — Registered data (the program or tool data includes an error) Stopped status: I — Reset stop Clearing procedure: P — Press reset key Display colour: Red On-screen parameters (shown in parentheses): System No., Cause: The inertia estimation has been attempted by G297 during movement of the axis whose inertia was to be estimated. The G298 parameter setup command has been set during movement of the parameter setup reference axis or of some axis assigned to the parameter data development system. The G298 parameter setup command has been set during cutting feed time constant changeover or control axis superposition. The G298 parameter setup command has been set during axis rotation. Action: Review and correct the program.
Source: Mazak Mazatrol Matrix — Parameter List, M-Codes, Alarm Manual (Section 3 Alarm)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Mazak Mazatrol Matrix CNC Alarms
Mazak controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 177 on the Mazatrol Matrix CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mazak's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 714 Mazak Mazatrol Matrix CNC codes.
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