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Code M01-1120: SP equivalent load factor over

Issue Description & Safety Warning

The Mitsubishi M800/M80 CNC has triggered a critical SP equivalent load factor over 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 equivalent load factor of the spindle motor has exc eeded the set threshold that causes the excess warning. Remedy  Change the operation pattern in a way that decreases the spindle motor load. Differential tap cmnd disabled 1131 Details  Differential speed tap command has been given alth ough any rotation command has not been input to the reference spindle that is under spindle superimposition control.  Synchronous tap command has been given to the refer ence spindle that is under spindle superimposition control. Remedy  Cancel the synchronous tapping cycle. Spd clamp in differential tap 1132 Details  A tap cycle or synchronous tap cycl e command given to the superimpo sed spindle has caused the spin- dle's actual rotation speed to exceed the spindle clamp speed. Remedy  Correct the spindle rotation speed in synchronous tap cycle. Constant surface spd disabled 1133 Details  A constant surface speed control command has been gi ven to the reference or superimposed spindle during differential speed tapping under spindle superimposition control.  A differential speed tapping command has been issued while constant surface sp eed control is executed on the reference or superimposed spindle that is under spindle superimposition control. Remedy  Cancel the synchronous tap cycle or constant surface speed control. Spindle sync cancel error 1135 Details  Spindle synchronization cancel command has been issued during rotation of C axis under spindle sync C axis control.  G113 (without the address H or D) has been issued during the spindle synchronization for two or more sync sets. Remedy  This operation error is cancelled when C axis st ops. Issue a spindle sync cancel command after C axis has stopped.  Use G113D or G113H to cancel the spindle synchronization. GB SP sync:Cancel sgnl illegal 1137 Details The guide bushing spindle synchronization temporary cancel signal was turned ON/OFF when the master spin- dle and the guide bushing spindle were in one of the following modes.  During rotation (when not stopped)  During tap cycle syn chronization mode  During spindle synchronization mode  During tool-spindle synchronization I (polygon machining) mode  During tool-spindle synchronization II (hobbing) mode  During spindle C axis control C axis mode  During orientation/indexing Remedy  Check the ladder program. GB SP sync runs independently 1138 Details  The reference spindle was commanded as a spindle related to tool spindle synchronization IC (polygon).  The guide bushing spindle was commanded as a synchronous tapping spindle.  The guide bushing spindle was commanded as a spindle related to spindle synchronization/tool spindle synchronization I (polygon)/tool spindle synchronizati on II (hobbing). 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 M01-1120 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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