Code 230003: <location>Power unit: DC link voltage, undervoltage
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Power unit: DC link voltage, undervoltage 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: All objects Reaction: OFF2 Acknowledge: IMMEDIATELY Cause: The power unit has detected an undervoltage condition in the DC link. - line supply failure - line supply voltage below the permissible value. - line supply infeed failed or interrupted. Note: The monitoring threshold for the DC link undervo ltage is the minimum of the following values: - for a calculation, refer to p0210. Remedy: - check the line supply voltage - check the line supply infeed and if necessary observe the fault messages of the line supply infeed. Note: The "ready for operation" signal of the infeed r0863 must be connected to the associated inputs p0864 of the drives. See also: p0210 (Drive unit line supply voltage)
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 230003 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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