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Code M01-1105: Spindle speed fluctuation

Issue Description & Safety Warning

The Mitsubishi M800/M80 CNC has triggered a critical Spindle speed fluctuation 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

Details The actual spindle speed has fluctuated exceeding the allowable range, while spindle speed fluctuation detec- tion (G162) is active. The number following "S", which is output together withthis alarm, indicates the spindle where speed fluctua- tions were detected. Remedy Unnecessarily large load may be applied to the spindle during automatic operation. Reduce the spindle load. To prevent this alarm from being output during spindle speed fluctuation detection (G162), set the param- eter #1242 set14 BIT2 to ON. Sp synchro phase calc illegal 1106 Details Spindle synchronization phase alignment command was issued while the "phase shift calculation request" sig- nal was ON. Remedy Correct the program. Correct the sequence program. Illegal cmd in SP oscillation 1108 Details A function that cannot be used with spindle oscillation was commanded during spindle oscillation. Remedy Command the function after finishing spindle oscillation. SP oscillation cmd illegal 1109 Details Spindle oscillation was commanded during executing a function that cannot be usedwith spindle oscillation. Remedy Command spindle oscillation after finishing the function that cannot used with spindle oscillation. SP oscillation set val illegal 1110 Details Spindle oscillation was commanded while a value out of range is set as spindle oscillation amplitude or spindle oscillation frequency. Remedy Check the setting values of the amplitude and frequency. Sub part system I call error 1111 Details Sub part system control I command(G122) has been given to a partsystem where the sub part system I operation mode is deactivated. Sub part system control I command (G122) has been given to a part systemwhich is not reserved as the sub part system in M80. Remedy Activate the sub part system I operation modefor the sub part system before issuing G122. Part systems marked "SUB" on the monitor screenare under the sub partsystem I operation mode. Command the sub part system startto the sub part system which isreserved with "#1483 SBS1_sys num" for M80. Sub part system II start error 1112 Details When the sub part system control II has been commanded, nopart system is left capable of being activated as a sub part system. Remedy Do not exceed the maximum number of simultaneously activatable sub part systems when commanding G144. Set the parameter #1437 SBS2_Spec BIT0 to 0 if you wish to wait until the sub part system becomes ca- pable of being activated. Constant surface speed rdndnt 1113 Details Constant surface speed is commanded from other part system to the spindle thatis in the thread/ thread cycle or the tapping cycle/ synchronous tapping cycle. To the spindle in constantsurface speed control, the thread/ thread cycle or the tapping cycle/ synchro- nous tapping cycle are commanded from other part system. Remedy Check the program.

Source: Mitsubishi M800/M80/E80 Series Alarm/Parameter Manual (IB-1501279)

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

About Mitsubishi M800/M80 CNC Alarms

Mitsubishi controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code M01-1105 on the M800/M80 CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mitsubishi's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.

Complete Alarm List: 722 Mitsubishi M800/M80 CNC codes.

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