What it means
A33902 reports an error while operating the internal SPI bus of the Sensor Module assigned to Encoder 3. The manuals describe this condition identically for G130, G150, S120 and S150. Depending on how the drive is configured, the same condition can also be output as a fault or as a message without any reaction.
Why it appears
- An error occurred when operating the internal SPI bus of Sensor Module Encoder 3.
What to check
- Replace the Sensor Module.
- If required, upgrade the firmware in the Sensor Module.
- Contact Technical Support.
Reading the message value
- The drive writes the alarm value into the message value; read it in r2124 and interpret it hexadecimal.
- The manual prints no decoding of this value — it is designated
Only for internal Siemens troubleshooting
.
Parameters the manual names
- r2124 — alarm value: holds the value belonging to this alarm; interpret it hexadecimal. The manual designates it only for internal Siemens troubleshooting and gives no decoding.
Acknowledging and restarting
The alarm itself requires no acknowledgement, and the drive takes no automatic stop action on this condition — it does not trip or change its operating state by itself. If the drive's configuration raises the same condition as a fault instead, that fault must be acknowledged immediately. The manuals describe no further restart steps for this message.
What differs between the drive families
Straight from the manuals' own fields — A33902 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS S120, S150 List Manual · p. 3176 |
| G130, G150 | NONE | NONE | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS G130, G150 List Manual · p. 1847 |
The drives this code lives on
A33902 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 A33902 mean on a SINAMICS drive?
It reports an error while operating the internal SPI bus of Sensor Module Encoder 3. Depending on the drive's configuration, the same condition can also be output as a fault or as a message without any reaction.
How do I fix A33902?
Replace the Sensor Module, upgrade its firmware if required, and contact Technical Support. The alarm itself needs no acknowledgement.
Does A33902 stop the drive?
No. The drive takes no automatic stop action on this condition; only if it is raised as a fault must that fault be acknowledged immediately.
What is the alarm value of A33902 in r2124?
The drive stores the alarm value in r2124, to be interpreted hexadecimal. The manual prints no decoding, because the value is designated only for internal Siemens troubleshooting.
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 A33xxx group · SINAMICS manuals · Siemens manuals