What it means
The manuals title this alarm SBT When selected, the brake is closed
. It belongs to the Safe Brake Test (SBT): at the moment the brake test is selected or started, the drive expects every brake to be open, and the alarm reports that at least one brake was still closed. The message value identifies which brake the drive found closed. The alarm causes no automatic drive reaction and does not have to be acknowledged; the condition that raised it must be removed and the brake test reselected. The S120/S150 and the G130/G150 manuals describe the alarm identically.
Why it appears
- When the brake test was selected or started, not all of the brakes were open — the Safe Brake Test requires every brake to be open at that moment.
- The alarm is also issued if a brake has not been configured in p10202 (SI Motion SBT brake selection).
What to check
- Read the alarm value in r2124 as a binary value to identify which brake is still closed: bit 0 = internal brake, bit 1 = external brake.
- Open all brakes.
- Check that the brake has been configured in p10202 — the alarm is also issued when a brake is missing there.
- Reselect the brake test (p10230.0, p10235.0).
Reading the message value
- The drive fills the message value
Following brakes are closed: %1 bin
with a binary pattern of the closed brakes; the alarm value is held in r2124 and must be interpreted binary. - Bit 0 = 1: The internal brake is closed.
- Bit 1 = 1: The external brake is closed (p10230.5, p10235.5, p10202).
Parameters the manual names
- r2124 — alarm value: read it as a binary number to see which brake this alarm found closed.
- p10202 — SI Motion SBT brake selection: check here that the brake for the Safe Brake Test is configured, because a missing configuration also triggers this alarm.
- p10230 — BI: SI Motion SBT control word (SBT STW): use bit 0 to reselect the brake test once all brakes are open.
- p10235 — CI: SI Safety Control Channel control word S_STW3B (SCC S_STW3B): use bit 0 to reselect the brake test once all brakes are open.
Acknowledging and restarting
The alarm does not have to be acknowledged. Open all brakes and reselect the brake test (p10230.0, p10235.0). Where the cause was a missing brake configuration in p10202, complete that configuration as well.
The same on every family
Every manual that describes A01780 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Safety monitoring channel has identified an error (10) | None | SINAMICS S120, S150 List Manual · p. 2701 |
| G130, G150 | NONE | NONE | Safety monitoring channel has identified an error (10) | None | SINAMICS G130, G150 List Manual · p. 1480 |
The drives this code lives on
A01780 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 SINAMICS alarm A01780 mean?
It is a Safe Brake Test (SBT) alarm: when the brake test was selected or started, not all of the brakes were open, so at least one brake was still closed. The alarm value in r2124 shows which brake.
How do I clear alarm A01780?
Open all brakes and reselect the brake test (p10230.0, p10235.0). The alarm does not have to be acknowledged.
Where can I see which brake A01780 refers to?
In the alarm value r2124, interpreted binary: bit 0 set means the internal brake is closed, bit 1 set means the external brake is closed.
Why does A01780 appear when no brake has been configured?
The alarm is also issued if a brake has not been configured in p10202 (SI Motion SBT brake selection), so the brake configuration must be checked as well.
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 A01xxx group · SINAMICS manuals · Siemens manuals