What it means
F34801 reports a DRIVE-CLiQ communications error from the Control Unit (CU) to the Voltage Sensing Module (VSM). The fault cause behind it is 10 (= 0A hex): The sign-of-life bit in the receive telegram is not set.
The CU therefore no longer sees the expected life sign in the telegram it receives back from the VSM. Depending on how the drive is configured, the same condition can also be issued as an alarm or with no reaction instead of a fault.
Why it appears
- A DRIVE-CLiQ communications error has occurred from the Control Unit to the Voltage Sensing Module (VSM).
- Fault cause 10 (= 0A hex): the sign-of-life bit in the receive telegram is not set, i.e. the telegram received from the VSM no longer carries the life sign the CU expects.
What to check
- Check the DRIVE-CLiQ connection.
- If the fault persists, replace the Voltage Sensing Module (VSM). For the vector drive objects (VECTOR) the manual formulates this second step as replacing the component involved.
Reading the message value
- The drive puts the component number and the fault cause into the message value (placeholders %1 and %2).
- The information is coded in r0949 (fault) / r2124 (alarm) as 0000yyxx hex: yy = component number, xx = error cause.
- For this code the error cause is always 10 (= 0A hex), the missing sign-of-life bit in the receive telegram; yy tells you which VSM component is affected.
Parameters the manual names
- r0949 (fault value): read the coded message value here when the drive raises F34801 as a fault — 0000yyxx hex with the component number in yy and fault cause 0A hex in xx.
- r2124 (alarm value): the same coding, to be read here when the drive outputs the condition as an alarm.
Acknowledging and restarting
Remove the cause first: check the DRIVE-CLiQ connection and, if the fault stays, replace the VSM (or, on the vector drive objects, the component involved). Afterwards the fault is acknowledged promptly, and the drive only becomes ready to restart once it has been acknowledged. Where the configuration outputs the condition as an alarm or with no reaction, the manual specifies no reaction and no acknowledgement step.
What differs between the drive families
Straight from the manuals' own fields — F34801 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 (NONE, OFF1) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 3184 |
| S120, S150 | NONE (OFF1, OFF2, OFF3) | — | Internal (DRIVE-CLiQ) communication error (12) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 3184 |
| G130, G150 | OFF2 (NONE, OFF1) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1855 |
| G130, G150 | NONE (OFF1, OFF2, OFF3) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1854 |
The drives this code lives on
F34801 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 F34801 mean on a SINAMICS drive?
It is a DRIVE-CLiQ communications error between the Control Unit and the Voltage Sensing Module (VSM): fault cause 10 (= 0A hex), the sign-of-life bit in the receive telegram is not set.
How do I clear F34801?
Check the DRIVE-CLiQ connection first. If the fault remains, the manual says to replace the Voltage Sensing Module (for the vector drive objects: the component involved), then acknowledge the fault.
Where do I read the F34801 fault value?
In r0949, or in r2124 when the condition is issued as an alarm. The value is coded 0000yyxx hex: yy is the component number and xx the fault cause, here 10 (= 0A hex).
Can F34801 also appear as an alarm?
Yes. Depending on the drive configuration, the same condition can also be issued as an alarm or with no reaction; the coded value is then found in r2124 instead of r0949.
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