Code Z71-0001: AbsEncoder:Backup voltage drop
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical AbsEncoder:Backup voltage drop 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 Backup voltage in the absolute encoder dropped. Remedy Replace the battery, check the cable connections, and ch eck the encoder. Turn the power ON again and per- form zero point initialization. Zero point initialization: Required Alarm reset when power is turned OFF: -(Z70-0101 is displayed after the power is turned ON again.) Servo alarm No.: 25
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 Z71-0001 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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