What it means
F33813 means that the logic unit (ALU) inside the DRIVE-CLiQ encoder wired as encoder 3 has failed. The drive learns of this over DRIVE-CLiQ: the encoder reports via its fault word that internal fault bits are set. Both entries for this code say the same thing in slightly different words — the logic unit of the DRIVE-CLiQ encoder has failed — and both refer to the encoder connected as encoder 3.
Why it appears
- The logic unit (ALU) of the DRIVE-CLiQ encoder connected as encoder 3 has failed.
- The encoder itself signals the failure: its DRIVE-CLiQ fault word delivers fault bits that have been set.
- Which condition is actually present is recorded in the fault value: the ALU watchdog has responded (bit 0), or the ALU has detected a sign-of-life error (bit 1).
What to check
- Read the fault value in r0949 and interpret it in binary to see which condition the encoder reported: bit 0 = ALU watchdog responded, bit 1 = ALU sign-of-life error.
- The remedy given in the manual is simply to replace the encoder; the wording qualifies this with
when the error reoccurs
.
Reading the message value
- The drive puts the fault cause into r0949 as a binary pattern (%1 bin) — the manual says to interpret the value in binary.
- Bit 0: ALU watchdog has responded.
- Bit 1: ALU has detected a sign-of-life error.
Parameters the manual names
- r0949 — fault value: holds the fault cause of F33813 in binary; bit 0 set means the ALU watchdog responded, bit 1 set means the ALU detected a sign-of-life error.
Acknowledging and restarting
The fault is acknowledged with the pulse inhibit set: once the encoder has been dealt with, acknowledge the fault (at the operator panel or in the commissioning tool) while the drive is inhibited, then start the drive again as usual. No further reset steps are described for this code.
What differs between the drive families
Straight from the manuals' own fields — F33813 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) | PULSE INHIBIT | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS S120, S150 List Manual · p. 3168 |
| G130, G150 | OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) | PULSE INHIBIT | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS G130, G150 List Manual · p. 1839 |
The drives this code lives on
F33813 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 SINAMICS fault F33813 mean?
The logic unit (ALU) of the DRIVE-CLiQ encoder connected as encoder 3 has failed; the encoder reports the condition itself via set fault bits in its DRIVE-CLiQ fault word.
What do the bits in r0949 mean for F33813?
Interpret r0949 in binary: bit 0 set means the ALU watchdog has responded, bit 1 set means the ALU has detected a sign-of-life error.
How do I fix F33813 and restart the drive?
The manual's remedy is to replace the encoder (when the error reoccurs). Acknowledge the fault with pulse inhibit once the encoder has been dealt with, then start the drive again.
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