What it means
F37903 is signalled by the HF Damping Module when an I2C bus error occurs on it. What the module has actually detected is a communications error with an EEPROM or with an analog/digital converter. The fault value stored in r0949 distinguishes the two possible underlying problems, so it should be read in hexadecimal before any action is taken.
Why it appears
- A communications error with an EEPROM or an analog/digital converter on the HF Damping Module.
- Fault value 80000000 hex: an internal software error lies behind the I2C bus error.
- Fault value 00000001 hex ... 0000FFFF hex: a module fault lies behind the I2C bus error.
What to check
- Read the fault value in r0949 and note it in hexadecimal.
- If the value is 80000000 hex, upgrade the firmware to a later version.
- If the value lies in the range 00000001 hex ... 0000FFFF hex, replace the HF Damping Module.
Reading the message value
- The drive stores the fault value in r0949, and the manual specifies that the value is interpreted hexadecimal.
- 80000000 hex — internal software error.
- 00000001 hex ... 0000FFFF hex — module fault.
Parameters the manual names
- r0949 — fault value: read the value stored here in hexadecimal to decide between the firmware upgrade (80000000 hex) and replacing the HF Damping Module (00000001 hex ... 0000FFFF hex).
Acknowledging and restarting
Acknowledge the fault immediately once the cause has been remedied — after the firmware upgrade, or after the HF Damping Module has been replaced.
The same on every family
Every manual that describes F37903 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE (IASC/DCBRK, OFF1, OFF2, OFF3, STOP2) | IMMEDIATELY | Hardware/software error (1) | None | SINAMICS S120, S150 List Manual · p. 3277 |
The drives this code lives on
F37903 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37903 mean on a SINAMICS S120 or S150?
The HF Damping Module has detected an I2C bus error, which the manual describes as a communications error with an EEPROM or with an analog/digital converter.
How do I clear fault F37903?
Read the fault value in r0949 in hexadecimal. For 80000000 hex upgrade the firmware to a later version; for values from 00000001 hex to 0000FFFF hex replace the HF Damping Module.
Where can I see the fault value of F37903?
The drive stores it in r0949, and the manual says to interpret the value hexadecimal.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the F37xxx group · SINAMICS manuals · Siemens manuals