What it means
A33470 is the drive's message when Encoder 3 signals an internal error — the manuals print the title as Encoder 3: Encoder signals an internal error (X521.7)
and, for the G130/G150, as Encoder 3: Soiling detected
. Both titles describe one and the same condition: the encoder itself reports that it is dirty. On the Sensor Module Cabinet 30 (SMC30), that soiling is signaled electrically by a 0 signal at terminal X521.7, and the drive turns this signal into the message for Encoder 3. Depending on the drive's configuration, the same condition can also be issued as a fault (F) or as a message with no reaction (N) instead of this alarm.
Why it appears
- The connected encoder reports that it is dirty. On the Sensor Module Cabinet 30 (SMC30), this soiling is signaled via a 0 signal at terminal X521.7, which the drive evaluates as an internal error of Encoder 3.
- The G130/G150 manual places the condition on the alternative encoder system interface on the SMC30, while the S120/S150 manual names the SMC30 in general; the signal path and the remedy are identical in both.
What to check
- Check the plug connections.
- Replace the encoder or the encoder cable.
Acknowledging and restarting
As an alarm, the message requires no acknowledgment; it goes away once the encoder no longer signals soiling at X521.7. The drive takes no automatic action on this code, so there is no restart sequence to perform. If the drive's configuration raises the same condition as a fault instead, the fault is acknowledged immediately, and the remedy is the same: check the plug connections, then replace the encoder or the encoder cable.
The same on every family
Every manual that describes A33470 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS S120, S150 List Manual · p. 3162 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS G130, G150 List Manual · p. 1834 |
The drives this code lives on
A33470 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 A33470 mean?
It means that Encoder 3 signals an internal error — in practice, that the encoder is dirty (soiling). On the Sensor Module Cabinet 30 (SMC30) the encoder reports this via a 0 signal at terminal X521.7.
Does A33470 stop the drive?
No. As an alarm the drive takes no automatic action. Depending on the configuration, the same condition can also appear as a fault (F) or as a message with no reaction (N).
How do I clear A33470?
Check the plug connections and, if the message stays, replace the encoder or the encoder cable. As an alarm it needs no acknowledgment; a fault variant is acknowledged immediately.
Which terminal and module does A33470 refer to?
It refers to terminal X521.7 on the Sensor Module Cabinet 30 (SMC30), evaluated for Encoder 3. For the G130/G150 the manual ties the message to the alternative encoder system interface on the SMC30.
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