What it means
F33850 reports that an internal software error has occurred in the Sensor Module that evaluates encoder 3. The component named by the fault is Sensor Module Encoder 3, and the G130, G150, S120 and S150 manuals describe it identically. The drive stores a fault value in r0949 that identifies which internal error occurred. Depending on the drive configuration, the same condition can also be output as an alarm (A) or without a reaction (N) instead of a fault; in those variants there is no reaction and nothing to acknowledge.
Why it appears
- An internal software error has occurred inside the Sensor Module of encoder 3. The fault value in r0949 (interpret decimal) shows the precise condition — for example a blocked background time slice, an incorrect checksum over the code memory, unusable OEM or EEPROM data, a faulted communication with the analog/digital converter, or a faulted DRIVE-CLiQ encoder initialization.
What to check
- Read the fault value in r0949 as a decimal number to determine which internal error the Sensor Module reported (see the list below).
- Replace the Sensor Module.
- If required, upgrade the firmware in the Sensor Module.
- Contact Technical Support.
Reading the message value
The drive stores the fault value in r0949, to be interpreted as a decimal number. The manual decodes it as follows:
- 1: Background time slice is blocked.
- 2: Checksum over the code memory is not OK.
- 10000: OEM memory of the EnDat encoder contains data that cannot be interpreted.
- 11000 ... 11499: Descriptive data from EEPROM incorrect.
- 11500 ... 11899: Calibration data from EEPROM incorrect.
- 11900 ... 11999: Configuration data from EEPROM incorrect.
- 12000 ... 12008: Communication with analog/digital converter faulted.
- 16000: DRIVE-CLiQ encoder initialization application error.
- 16001: DRIVE-CLiQ encoder initialization ALU error.
- 16002: DRIVE-CLiQ encoder HISI / SISI initialization error.
- 16003: DRIVE-CLiQ encoder safety initialization error.
- 16004: DRIVE-CLiQ encoder internal system error.
Parameters the manual names
- r0949 — fault value: read it after the trip and interpret it as a decimal number to identify which internal software error the Sensor Module of encoder 3 reported.
Acknowledging and restarting
F33850 is acknowledged with POWER ON: the fault only clears when the drive's power supply is switched off and back on, and only then can the drive be restarted. If the drive is configured to output this condition as an alarm (A) or without a reaction (N), the manual specifies neither a reaction nor an acknowledgement for those variants.
What differs between the drive families
Straight from the manuals' own fields — F33850 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Servo: OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) Vector: OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) Hla: OFF1 (NONE, OFF2, OFF3) | POWER ON | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS S120, S150 List Manual · p. 3171 |
| G130, G150 | OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) | POWER ON | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS G130, G150 List Manual · p. 1842 |
The drives this code lives on
F33850 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F33850 mean on a SINAMICS drive?
It reports an internal software error in the Sensor Module that evaluates encoder 3. The value stored in r0949, read as a decimal number, identifies which internal error occurred.
How do I clear fault F33850?
Acknowledge it with POWER ON — switch the drive power supply off and on again. The manual's remedy is to replace the Sensor Module and, if required, upgrade its firmware; otherwise contact Technical Support.
What does fault value 10000 in r0949 mean for F33850?
It means the OEM memory of the connected EnDat encoder contains data that cannot be interpreted. Ranges 11000 to 11999 similarly indicate incorrect descriptive, calibration or configuration data from the EEPROM.
Which component raises F33850?
The fault is raised locally by Sensor Module Encoder 3. The G130, G150, S120 and S150 manuals describe the same component and the same remedy.
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 F33xxx group · SINAMICS manuals · Siemens manuals