What it means
Alarm A06901 is raised when a Braking Module in "Booksize" format reports its "Pre-alarm I2t shutdown" through terminal X21.3. The signal reaches the drive only because X21.3 is wired to a digital input of the system and this input is interconnected at binector input p3865[0...7]; the alarm comes out of that interconnection. The manuals state that the function is not supported for the "chassis" format, so the pre-alarm path via p3865[0...7] exists for Booksize units only.
Why it appears
- A Braking Module of "Booksize" format has output its pre-alarm of the I2t shutdown at terminal X21.3.
- The signal arrives in the drive because terminal X21.3 is wired to a digital input of the system and interconnected there using binector input p3865[0...7].
- Braking Modules of "chassis" format do not support this function, so the alarm concerns only the Booksize design.
What to check
- Reduce the number of braking operations.
- Check binector input p3865[0...7] and the wiring that runs from terminal X21.3 of the Braking Module concerned.
Parameters the manual names
- p3865 (BI: Braking Module pre-alarm I2t shutdown / BM pre-A I2t shutd) — the binector input at which the signal wired from terminal X21.3 must be interconnected; verify this interconnection when A06901 appears.
Acknowledging and restarting
No acknowledgement is needed for this alarm. It goes away once the cause is removed: fewer braking operations, and the interconnection at p3865[0...7] together with the wiring from terminal X21.3 found in order.
The same on every family
Every manual that describes A06901 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. 1531 |
The drives this code lives on
A06901 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 alarm A06901 mean on a SINAMICS S120 or G130?
A Booksize-format Braking Module is signalling its pre-alarm of the I2t shutdown at terminal X21.3, and that signal is interconnected at binector input p3865[0...7]. The function is not supported for the chassis format.
How do I clear A06901?
Reduce the number of braking operations and check binector input p3865[0...7] along with the wiring from terminal X21.3 of the Braking Module. No acknowledgement action is required.
Which parameter belongs to A06901?
p3865, the binector input for the Braking Module pre-alarm I2t shutdown; the signal from terminal X21.3 must be interconnected there.
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