What it means
F06855 is raised by the infeed when the line filter monitor responds: a threshold value parameterized in p3678 has been exceeded or undershot in the line filter. The message value is the fault value, which the drive also holds in r0949; the manual says to interpret it as a decimal number. The decoding below identifies the threshold that responded and the power unit of the Active Interface Module involved.
Why it appears
- A threshold value parameterized in p3678, the filter monitoring threshold values, has been exceeded or undershot in the line filter.
- Which condition tripped the monitor is coded in the fault value: a voltage threshold of the alpha/beta voltage monitoring or of the phase voltage monitoring fallen below (p3678[0]), or the current threshold value exceeded (p3678[1]).
What to check
- Check the parameterization of the threshold values for filter monitoring (p3678).
- Check the filter.
- For fault value 0: check the parameterization of the voltage monitoring smoothing time (p3679[0]).
- For fault value 1: check the parameterization of the current monitoring minimum time (p3679[1]).
Reading the message value
- 0: voltage threshold, alpha/beta voltage monitoring fallen below (p3678[0]).
- 2: voltage threshold value of the phase voltage monitoring fallen below (p3678[0]).
- x1: current threshold value exceeded (p3678[1]).
The 10th position codes the power unit number of the Active Interface Module involved.
The manual gives the examples 01 for overcurrent in line filter 1 and 11 for overcurrent in line filter 2.
Parameters the manual names
- p3678 — Filter monitoring threshold values: the thresholds whose parameterization you check when F06855 occurs; the voltage thresholds sit in p3678[0] and the current threshold in p3678[1].
- p3679 — Transformer filter monitoring times: for fault value 0 check the voltage monitoring smoothing time p3679[0]; for fault value 1 check the current monitoring minimum time p3679[1].
- r0949 — Fault value: read the fault value here and interpret it as a decimal number to see which threshold responded and which power unit is involved.
Acknowledging and restarting
The drive switches off immediately and coasts down when this fault trips. Once the cause has been remedied, acknowledge the fault immediately — the drive will not start again before the acknowledgement.
The same on every family
Every manual that describes F06855 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Line filter faulted (15) | Power Module | SINAMICS S120, S150 List Manual · p. 2772 |
The drives this code lives on
F06855 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F06855 mean in SINAMICS?
It means the infeed's line filter monitor has responded: a threshold value parameterized in p3678 has been exceeded or undershot in the line filter. The fault value in r0949 shows which threshold and which power unit is involved.
How do I clear fault F06855?
Check the parameterization of the filter monitoring threshold values in p3678 and check the filter itself. For fault value 0 also check the voltage monitoring smoothing time p3679[0], for fault value 1 the current monitoring minimum time p3679[1], then acknowledge the fault immediately.
What does the F06855 fault value tell me?
Value 0 means the alpha/beta voltage monitoring fell below its threshold (p3678[0]), 2 means the phase voltage monitoring fell below (p3678[0]), and x1 means the current threshold was exceeded (p3678[1]). The 10th position codes the power unit number, for example 01 for overcurrent in line filter 1 and 11 for line filter 2.
Which parameters belong to F06855?
p3678 holds the filter monitoring threshold values and p3679 the transformer filter monitoring times. r0949 holds the fault value, which you interpret as a decimal number.
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 F06xxx group · SINAMICS manuals · Siemens manuals