What it means
A34904 carries the manual title VSM: EEPROM. It is raised by the Voltage Sensing Module (VSM) when an access to its non-volatile memory — the EEPROM on the Terminal Module — fails. The manuals for the G130, G150, S120 and S150 describe the message identically. Depending on the drive's configuration, the same condition can also be issued as a fault (F) or as a message without any reaction (N) instead of this alarm.
Why it appears
- An error occurred while accessing the non-volatile memory on the Terminal Module. Both entries describe this single cause for the Voltage Sensing Module (VSM); no other causes are given.
What to check
- Replace the Voltage Sensing Module (VSM). The manuals name this as the only remedy — no parameter change, wiring check or other measure is described for this message.
Acknowledging and restarting
As an alarm, the message needs no acknowledgement action and does not stop the drive. When the converter raises the same condition as a fault instead, it must be acknowledged immediately, and this happens by powering up again (POWER ON). After the VSM has been replaced, the message should not return.
The same on every family
Every manual that describes A34904 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Hardware/software error (1) | Voltage Sensing Module (VSM) | SINAMICS S120, S150 List Manual · p. 3195 |
| G130, G150 | NONE | NONE | Hardware/software error (1) | Voltage Sensing Module (VSM) | SINAMICS G130, G150 List Manual · p. 1864 |
The drives this code lives on
A34904 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 A34904 VSM: EEPROM mean on a SINAMICS drive?
It reports that an access to the non-volatile memory (EEPROM) on the Terminal Module failed. The message comes from the Voltage Sensing Module (VSM) and is described for the G130, G150, S120 and S150.
How do I fix alarm A34904?
The manuals give exactly one remedy: replace the Voltage Sensing Module (VSM). No parameters are associated with this message and no other measures are described.
Does A34904 stop the drive, and how is it acknowledged?
As an alarm it does not stop the drive and needs no acknowledgement. If the configuration raises the same condition as a fault, it is acknowledged immediately by powering up again (POWER ON).
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 A34xxx group · SINAMICS manuals · Siemens manuals