Code 206250: <location>Infeed: Defective capacitor(s) in at least one phase of line filter
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Infeed: Defective capacitor(s) in at least one phase of line filter 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: %1 Drive object: A_INF, S_INF Reaction: NONE Acknowledge: NONE Cause: A change in the line filter capacitanc e was detected in at least line phase. The voltages and phase currents of the line filter, measured using a Voltage Sensing Module (VSM), indicated a deviation of the filter capacit ances from the value parameterized in p0221. A change or a defect of the line filter capacitors results in a shift of the resonant frequencies and can result in severe damage to the drive system. Alarm value (r2124, floating point): The calculated present capacitance in µF (rounded-off to an integer number). The 1st decimal point specifies the number of the phase (1, 2, 3) where the capacitance deviates from the specified value. Remedy: - check the parameterized value of the filter capacitance (p0221). - check the correct wiring of the Voltage Sensing Module (VSM): Differential voltages u12 and u23 must be present at the 100 V/690 V inputs of the VSM; the phase currents of the line filter must be connected to the 10 V inputs through a current - voltage converter. - check the alarm limits for the permissib le filter capacitance deviation (p3676). - check the normalization of the line supply voltage measurement using the VSM (p3660). - check the normalization of the filter current measurement using the VSM (p3670). - check the line filter capacitors and if required, replace the line filter. See also: p0221, p3660, p3670, p3676 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 206250 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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