Code 205053: <location>Parallel circuit: Inadmi ssible DC link vo ltage dissymmetry
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Parallel circuit: Inadmi ssible DC link vo ltage dissymmetry 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, VECTOR Reaction: NONE Acknowledge: NONE Cause: The deviation of the DC link voltage measured values exceeds the alarm threshold specified in p7011. Remedy: - inhibit the pulses of the faulted power unit (p7001). - check the DC link connecting cables. - the DC link voltage measurement is incorrect and must be calibrated or renewed. 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 205053 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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