What it means
A32903 reports that an error occurred while the internal I2C bus was being operated. The component concerned is the Sensor Module assigned to Encoder 2 on S120 and S150. Depending on how the drive is configured, the same condition can also be signalled as a fault or as a message without any reaction; as an alarm it does not cause the drive to perform an automatic stop.
Why it appears
- An error occurred when operating the internal I2C bus — this is the only cause the manual names for this code.
What to check
- Replace the Sensor Module.
- If required, upgrade the firmware in the Sensor Module.
- If the condition is still present afterwards, contact Technical Support.
Reading the message value
- The drive places the alarm value belonging to this alarm in the message value; it is stored in r2124 and is to be interpreted hexadecimal.
- No bit or value decoding is published: according to the manual, the alarm value serves only internal Siemens troubleshooting.
Parameters the manual names
- r2124 — holds the alarm value of this alarm (interpret hexadecimal); the manual designates this value for internal Siemens troubleshooting only, so there is no user-level evaluation for this code.
Acknowledging and restarting
The alarm requires no acknowledgement and triggers no automatic reaction, so no reset is needed to continue operation. If the drive is configured to signal the same condition as a fault instead, that fault must be acknowledged immediately.
The same on every family
Every manual that describes A32903 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Hardware/software error (1) | Sensor Module Encoder 2 | SINAMICS S120, S150 List Manual · p. 3127 |
The drives this code lives on
A32903 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A32903 on SINAMICS mean?
It reports an error while operating the internal I2C bus of the Sensor Module assigned to Encoder 2 on S120 or S150.
How do I clear A32903?
The manual gives three steps in order: replace the Sensor Module, upgrade its firmware if required, and contact Technical Support if the condition remains.
Does A32903 stop the drive or need to be acknowledged?
No — as an alarm it has no automatic reaction and needs no acknowledgement; only when the drive is configured to raise the same condition as a fault must it be acknowledged immediately.
What is r2124 for A32903?
It holds the alarm value, interpreted hexadecimal, but the manual reserves it for internal Siemens troubleshooting and publishes no decoding.
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 A32xxx group · SINAMICS manuals · Siemens manuals