Code F00051: Parameter EEPROM Fault
Issue Description & Safety Warning
The Siemens SINAMICS G120 CU240S Drive has triggered a critical Parameter EEPROM Fault 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
Reaction: OFF 2 Acknowledge: Quit fault eg. via DI2 Cause: Read or write failure while access to EEPROM. This can also be caused by the EEPROM being full, too many parameters have been changed. Remedy: - Must be Power Cycled to cancel this bug as some parameters may not be read correct. - Factory Reset and new parameterization, if power cycle does not remove fault - Change inverter control unit - Change some parameters back to default values if the EEPROM is full, then power cycle Note: - r0949 = 1: EEPROM Full - r0949 = 1000 + Block No: Reading data block failed - r0949 = 2000 + Block No: Reading data block timeout - r0949 = 3000 + Block No: Reading data block CRC failed - r0949 = 4000 + Block No: Wrinting data block failed - r0949 = 5000 + Block No: Writing data block timeout - r0949 = 6000 + Block No: writing data block verify failed - r0949 = 7000 + Block No: Reading data block at wrong time - r0949 = 8000 + Block No: writing data block at wrong time - r0949 = 9000 + Block No: Factory Reset did not work becuase restart or power failure
Source: SINAMICS G120 Control Units CU240S Faults and Alarms (Edition 05/2007)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINAMICS G120 CU240S Drive Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code F00051 on the SINAMICS G120 CU240S Drive 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: 108 Siemens SINAMICS G120 CU240S Drive codes.
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