What it means
F34851 is raised when the Voltage Sensing Module (VSM) involved fails to set its sign-of-life to the Control Unit. The drive treats this as a DRIVE-CLiQ communication error from the VSM to the Control Unit: in the receive telegram, the sign-of-life bit is not set, which the manual records as fault cause 10 (= 0A hex).
Why it appears
- A DRIVE-CLiQ communication error between the involved VSM and the Control Unit: the DRIVE-CLiQ component did not set its sign-of-life to the Control Unit.
- Fault cause 10 (= 0A hex) — the sign-of-life bit in the receive telegram was not set.
What to check
- Identify the component involved: the drive codes the component number in the message value (0000yyxx hex, readable in r0949 or r2124); the yy portion is the component number.
- Carry out the remedy the manual specifies: upgrade the firmware of the component involved.
Reading the message value
- The message value contains two items: the component number (%1) and the fault cause (%2).
- Coding in r0949 (fault value) and r2124 (alarm value): 0000yyxx hex — yy = component number, xx = error cause.
- Error cause 10 (= 0A hex): the sign-of-life bit in the receive telegram is not set.
Parameters the manual names
- r0949 (fault value): holds the coded message value 0000yyxx hex for this fault — read the component number (yy) of the affected VSM and the error cause (xx) from it.
- r2124 (alarm value): the manual names this parameter alongside r0949 as the place where the same coded message value of this message is stored.
Acknowledging and restarting
This fault is acknowledged IMMEDIATELY — acknowledge it directly as soon as it appears. The manual describes no further restart or reset procedure for this code; if the sign-of-life error occurs again after the acknowledgement, upgrade the firmware of the component involved.
What differs between the drive families
Straight from the manuals' own fields — F34851 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF2 (NONE, OFF1) Servo: NONE (OFF1, OFF2) Vector: NONE (OFF1, OFF2) Hla: NONE (OFF1, OFF2) | — | Internal (DRIVE-CLiQ) communication error (12) | Voltage Sensing Module (VSM) | SINAMICS S120, S150 List Manual · p. 3189 |
| G130, G150 | Vector: NONE (OFF1, OFF2) Infeed: OFF2 (NONE, OFF1) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Voltage Sensing Module (VSM) | SINAMICS G130, G150 List Manual · p. 1859 |
The drives this code lives on
F34851 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 F34851 mean on a SINAMICS drive?
A Voltage Sensing Module (VSM) did not set its sign-of-life to the Control Unit over DRIVE-CLiQ. Fault cause 10 (= 0A hex) means the sign-of-life bit in the receive telegram is not set.
How do I find out which VSM triggered F34851?
The drive codes the component number in the message value 0000yyxx hex, readable in r0949 (fault value) or r2124 (alarm value); the yy portion is the component number.
How is F34851 cleared?
Acknowledge the fault IMMEDIATELY; the only remedy the manual gives is to upgrade the firmware of the component involved.
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 F34xxx group · SINAMICS manuals · Siemens manuals