Code 25070: Axis %1 drift value too large
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 drift value 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
Parameters: %1 = Axis name, spindle number Definitions: Only with analog drives! The permissible maximum value of drift (internal, integrated drift value of automatic drift compensation) was exceeded during the last compensation operation. The permissible maximum value is defined in the axis-specific MD36710 $MA_DRIFT_LIM IT. The drift value itself is not limited. Automatic drift compensation: MD36700 $MA_DRIFT_ENABLE=1 The difference between actual and set point position (drift) is checked cyclically in the IPO cycle when the axes are at zero speed. The difference is automa tically compensated to zero by slowly integrating an internal drift value. Drift compensation by hand: MD36700 $MA_DRIFT_ENABLE=0 A static offset can be added to the speed setpoint in the MD36720 $MA_DRIFT_VALUE. This is not included in the drift monitoring because it acts like a voltage zero offset. Reaction: Alarm display. Remedy: Please inform the authorized personnel/service departm ent. Adjust the drift compensation with the automatic drift compensation switched off at the driv e until the position lag is approximately zero. Then reactivate the automatic drift compensation in orde r to balance out the dynamic drift changes (effects of heating up). Program Continuation: Clear alarm with the Delete key or NC START.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 25070 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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