Code T01-0165: Cycle st. prohibit(safe speed)
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Cycle st. prohibit(safe speed) 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 An automatic operation was started in one of the following machining modes during the safe speed clamp: thread cutting, synchro nous tapping, cross machining, superimposition control, tool center point control or SSS control. Remedy Turn ON the safely-limited speed monitoring request signal and press the cycle start button. Close the door and press the cycle start button. Cycle start prohibit (AL Z83) 0172 Details Cycle start is disabled while the system alarm Z83 (NC started during SP rotation) is occurring. Remedy Turn OFF the power and make sure that the spindle is at a standstill. And then turn the power ON again. In interference check alarm 0173 Details Cycle start cannot be operated because interference check alarm is in progress. Remedy Release the interference check alarm before operating the cycle start. Cycle st forbid (measuring err) 0176 Details Cycle start cannot be exec uted for other part systems duri ng measurement of rotation center error or workpiece installation error. Remedy Execute cycle start for one part system that is ready for measurement. Cancel measurement when error measurement is not executed. Cycle start prohibit (OP error) 0177 Details Cycle start was executed during operation e rror where cycle start cannot be executed. Remedy After canceling o peration error, ex ecute cycle start. Cycle start prohibit(SBT warn) 0185 Details Cycle start is disabled be cause the axis in SBT warning exists in the system. Remedy After cancelling the SBT warn ing, execute the cycle start. Cycle start prohibit 0190 Details Automatic start is not possible because the setting of setup parameters is enabled. Remedy Refer to the manual issued by the machine tool builder. Cycle start prohibit 0191 Details Automatic start was attempted while a file was being deleted/written. Remedy Wait for the file to be deleted/writt en and then execute the automatic start. Cycle st. prohibit (Term exp'd) 0193 Details Automatic start is not possible because the valid term has been expired. Remedy Obtain a decryption code from the machine tool builder and input it in the NC, then turn the power ON again.
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 T01-0165 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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