What it means
The manuals call this message Braking Module: Fault (1 -> 0)
: the Braking Module reports a fault by dropping its binary fault signal from 1 to 0. The signal leaves the Braking Module at terminal X21.4 ("booksize" format) or X21.5 ("chassis" format), is wired to a system digital input and reaches the drive through binector input p3866[0...7]. Depending on how the drive is configured, the same condition can also be output as a fault instead of an alarm.
Why it appears
- The wiring of the fault signal is incorrect, or the BICO interconnection of the signal source is wrong.
- Overtemperature.
- The electronics power supply of the Braking Module is missing.
- A ground fault or short-circuit.
- An internal component fault in the Braking Module.
What to check
- Check binector input p3866[0...7] and the wiring from terminal X21.4 ("booksize" format) or X21.5 ("chassis" format).
- Reduce the number of braking operations (remedy for the overtemperature cause).
- Check the 24 V power supply of the component.
- Check for a ground fault or short circuit.
- If the Braking Module itself is defective (internal component fault), replace it.
Parameters the manual names
- p3866 (BI: Braking Module fault / BM fault) — the binector input through which the Braking Module's fault signal is interconnected; when A06900 appears, check the interconnection of p3866[0...7] together with the wiring of the signal.
Acknowledging and restarting
As an alarm, the message needs no acknowledgement and the drive takes no automatic reaction; it disappears by itself once the Braking Module stops reporting the fault. Rectify the cause first — the checks above follow the manual's remedies in order. If the drive is configured to output the same condition as a fault, that fault must be acknowledged immediately before the drive can be restarted.
The same on every family
Every manual that describes A06900 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Braking Module faulted (14) | None | SINAMICS S120, S150 List Manual · p. 2773 |
| G130, G150 | NONE | NONE | Braking Module faulted (14) | None | SINAMICS G130, G150 List Manual · p. 1530 |
The drives this code lives on
A06900 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 A06900 mean on a SINAMICS drive?
The Braking Module reports a fault: its fault signal at X21.4 (booksize format) or X21.5 (chassis format) drops from 1 to 0 and reaches the drive via binector input p3866[0...7].
Does A06900 stop the drive, and must it be acknowledged?
No. As an alarm it triggers no automatic reaction and needs no acknowledgement; it clears itself once the Braking Module stops reporting the fault. If the drive is configured to raise the same condition as a fault, that fault must be acknowledged immediately.
What causes A06900?
The manual lists incorrect wiring or BICO interconnection of the signal, overtemperature, a missing 24 V electronics power supply, a ground fault or short-circuit, and an internal component fault in the Braking Module.
How do I fix A06900?
Work through the manual's remedies: check p3866[0...7] and the wiring from X21.4/X21.5, reduce the number of braking operations, verify the 24 V supply, check for a ground fault or short circuit, and replace the component if necessary.
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 A06xxx group · SINAMICS manuals · Siemens manuals