What it means
The drive was not able to carry out the automatic test stop after powering up and is now waiting for STO (Safe Torque Off) to be deselected via the SMM. Either STO is currently selected via Safety Extended Functions, or a safety message that resulted in a STO is present. Until the blocking condition is gone, the automatic test stop cannot be performed.
Why it appears
- STO is selected via Safety Extended Functions.
- A safety message is present that resulted in a STO.
What to check
- Deselect STO via Safety Extended Functions.
- Remove the cause of the safety messages and acknowledge the messages.
Acknowledging and restarting
This alarm does not itself have to be acknowledged. Deselect STO via Safety Extended Functions and, where a safety message is present, remove its cause and acknowledge those messages. The automatic test stop is performed after removing the cause.
What differs between the drive families
Straight from the manuals' own fields — A30788 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Motor | SINAMICS S120, S150 List Manual · p. 3012 |
| G130, G150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Motor | SINAMICS G130, G150 List Manual · p. 1703 |
| G120 | NONE | NONE | Safety monitoring channel has identified an error (10) | — | SINAMICS G120 · p. 930 |
The drives this code lives on
A30788 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A30788 mean on a SINAMICS drive?
The drive could not perform the automatic test stop after powering up because STO (Safe Torque Off) is still selected, so it is waiting for STO to be deselected via the SMM.
How do I clear alarm A30788?
Deselect STO via Safety Extended Functions and, where a safety message is present, remove its cause and acknowledge the messages. The automatic test stop is then performed after the cause has been removed.
Does A30788 have to be acknowledged?
No, the alarm itself requires no acknowledgment. Only the safety messages whose cause you removed have to be acknowledged.
Why does A30788 appear after powering up?
Because the automatic test stop could not be carried out at power-up: either STO is selected via Safety Extended Functions or a safety message that resulted in a STO is present. The drive keeps waiting until STO is deselected via the SMM.
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 A30xxx group · SINAMICS manuals · Siemens manuals