Code Z59-000: Acc/dec time cnst too large
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Acc/dec time cnst too large 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 Acceleration and deceleration ti me constants are too large. (This alarm occurs with the stop code (T02 0206).) Remedy Set the larger value for "#1206 G1bF(Maximum speed)". Set the smaller value for "#1207 G1btL(Time constant)". Set the lower feedrate.
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 Z59-000 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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