Code 206810: <location>Infeed: DC link voltage alarm threshold
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Infeed: DC link voltage alarm threshold 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
Message value: Drive object: A_INF, B_INF, S_INF Reaction: NONE Acknowledge: NONE Cause: In operation, the DC link voltage has dropped to bel ow the alarm threshold. The alarm threshold is obtained from the sum of p0279 and r0296. Possible causes include: - line supply voltage dip or an other line supply fault. - overload of the infeed. - for ALM: Incorrect controller parameterization. See also: p0279 (DC link voltage offset alarm thres hold), r0296 (DC link voltage undervoltage threshold) Remedy: - check the line voltage and line supply quality. - reduce the power drawn, avoid step-like load changes - for ALM: Adapt the controller parameterization, e.g. using an automatic line supply identification (p3410 = 4, 5). SINAMICS-Alarms
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 206810 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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