What it means
A01783 reports that the brake did not close in time during the Safe Brake Test (SBT): the test allows the brake a maximum of 11 s to close, and this time was exceeded before the brake reported the closed state. The alarm value in r2124 distinguishes the two cases the manual describes — an internal brake that was not able to be closed, or an external brake that was not able to be closed. The entries in the S120/S150 and the G130/G150 documentation match word for word, so the same reading and the same remedy hold across both platforms.
Why it appears
- The brake was not able to close within the maximum time of 11 s that the brake test permits.
What to check
- With an external brake, check that its feedback signal "brake closed" is interconnected correctly with the brake test control word at p10230.5 and p10235.5.
- With an internal brake that uses an external feedback signal, check whether the feedback signal is interconnected correctly with the extended brake control.
- Carry out a safe acknowledgment.
- Restart the brake test through the signals at p10230.1 and p10235.1.
Reading the message value
The drive stores the cause as a binary pattern in the alarm value r2124:
- Bit 0 = 1: the internal brake was not able to be closed.
- Bit 1 = 1: the external brake was not able to be closed.
Parameters the manual names
- r2124 — the alarm value of this message; interpreted in binary it names the brake that failed to close (bit 0 internal, bit 1 external).
- p10230 — BI input for the SBT control word (STW); for this code the brake test restart signal is interconnected here (p10230.1) together with the "brake closed" feedback of an external brake (p10230.5).
- p10235 — CI input for the control word of the safety control channel (SCC); it carries the same restart signal (p10235.1) and the same brake feedback interconnection (p10235.5).
Acknowledging and restarting
Once the feedback interconnection has been checked and, where necessary, corrected, carry out a safe acknowledgment and then restart the brake test via the signals at p10230.1 and p10235.1.
The same on every family
Every manual that describes A01783 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. 2702 |
| G130, G150 | NONE | NONE | Safety monitoring channel has identified an error (10) | None | SINAMICS G130, G150 List Manual · p. 1482 |
The drives this code lives on
A01783 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 A01783 mean on a SINAMICS drive?
The brake did not close within the maximum 11 s granted during the Safe Brake Test (SBT), so the drive raised this alarm.
How can I see whether the internal or the external brake failed?
Read the alarm value r2124 in binary: bit 0 = 1 means the internal brake was not able to be closed, bit 1 = 1 means the external brake was not able to be closed.
How is A01783 cleared?
Check the interconnection of the "brake closed" feedback — for an external brake with the brake test control word (p10230.5, p10235.5), for an internal brake with external feedback with the extended brake control — then carry out a safe acknowledgment and restart the brake test via p10230.1 and p10235.1.
What does SBT stand for in A01783?
Safe Brake Test, the drive function whose permitted brake closing time of at most 11 s was exceeded here.
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