What it means
F34899 is raised when the Voltage Sensing Module (VSM) reports a fault that the Control Unit (CU) firmware cannot interpret. The typical situation is a VSM whose firmware is more recent than the firmware on the Control Unit. The drive is not tripped by this code (no OFF1, OFF2 or OFF3 response); depending on the drive configuration, the same condition can also be signalled only as an alarm or as a message with no reaction at all. If required, the significance of this new fault can be read about in a more recent description of the Control Unit.
Why it appears
- The Voltage Sensing Module has reported a fault number that the Control Unit firmware does not know and therefore cannot interpret.
- This occurs when the firmware on the VSM is more recent than the firmware on the Control Unit.
What to check
- Read the fault value in r0949, interpreted as a decimal number; it contains the fault number that the VSM reported.
- Compare the firmware versions: r0158 shows the VSM firmware version, r0018 shows the Control Unit firmware version.
- If the VSM firmware is newer than the CU firmware, replace the firmware on the Voltage Sensing Module with an older firmware version.
- Alternatively, upgrade the firmware on the Control Unit so that it can interpret the reported fault.
- If you need the meaning of the new fault number, look it up in a more recent description of the Control Unit.
Reading the message value
- The message text appears as "New message" together with the reported value (placeholder %1).
- The fault value in r0949, interpreted as a decimal number, is the fault number itself.
- No bit decoding is printed — the value is simply the number of the fault the Control Unit cannot identify.
Parameters the manual names
- r0949 — read here, as a decimal value, the fault number that the VSM reported and the CU firmware cannot interpret.
- r0158 — shows the firmware version of the Voltage Sensing Module; use it to check for the version mismatch and to select an older VSM firmware to load.
- r0018 — shows the firmware version of the Control Unit; compare it against the VSM version and bring the CU to a newer level as the remedy.
Acknowledging and restarting
The fault must be acknowledged IMMEDIATELY; acknowledgement by POWER ON (switching the supply voltage off and on again) is also possible. Since the drive does not trip by itself on this code, no further restart is needed beyond the acknowledgement — the actual fix is the firmware measure described above.
What differs between the drive families
Straight from the manuals' own fields — F34899 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: NONE (OFF1, OFF2) Vector: NONE (OFF1, OFF2, OFF3) | IMMEDIATELY (POWER ON) | Infeed faulted (13) | Voltage Sensing Module (VSM) | SINAMICS S120, S150 List Manual · p. 3194 |
| G130, G150 | Vector: NONE (OFF1, OFF2, OFF3) Infeed: NONE (OFF1, OFF2) | IMMEDIATELY (POWER ON) | Infeed faulted (13) | Voltage Sensing Module (VSM) | SINAMICS G130, G150 List Manual · p. 1863 |
The drives this code lives on
F34899 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 F34899 VSM: Unknown fault mean?
The Voltage Sensing Module has reported a fault number that the Control Unit firmware cannot interpret. This normally happens when the firmware on the VSM is more recent than the firmware on the Control Unit.
How do I fix fault F34899?
Either replace the firmware on the Voltage Sensing Module with an older version (the current version is shown in r0158) or upgrade the firmware on the Control Unit (version in r0018). The meaning of the new fault number can be found in a more recent description of the Control Unit.
How is F34899 acknowledged and cleared?
It must be acknowledged immediately; acknowledgement by POWER ON (cycling the supply voltage) is also possible. The drive does not trip on this fault, so no restart beyond the acknowledgement is required.
Where can I read the unknown fault number of F34899?
In r0949, interpreted as a decimal value — it contains the fault number that the VSM reported. No further bit decoding is printed for this code.
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