What it means
A33442 is reported by Encoder 3 on SINAMICS G130, G150, S120 and S150. While the drive is switched off, the encoder uses a battery to back up its multiturn information. The battery voltage has now reached the alarm threshold — the G130/G150 manual titles the same message as a pre-alarm — so the multiturn information can no longer be buffered if the voltage drops even further. Depending on how the drive is configured, the same condition can also be issued as a fault or with no reaction.
Why it appears
- While the drive is switched off, the encoder backs up its multiturn information from a battery.
- The battery voltage has dropped to the alarm threshold; if it falls even further, the multiturn information can no longer be buffered.
What to check
- Replace the battery.
Acknowledging and restarting
Replace the battery — that is the complete remedy the manuals give. The alarm variant does not switch the drive off and does not have to be acknowledged; if the drive outputs the same condition as a fault, the fault must be acknowledged immediately.
The same on every family
Every manual that describes A33442 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. 3160 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS G130, G150 List Manual · p. 1831 |
The drives this code lives on
A33442 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 A33442 mean on a SINAMICS drive?
A33442 comes from Encoder 3: the battery that backs up the encoder's multiturn information while the drive is switched off has reached its voltage alarm threshold (pre-alarm). If the voltage drops even further, the multiturn information can no longer be buffered.
How do I clear A33442?
Replace the encoder battery — the manuals give no other remedy. The alarm itself needs no acknowledgment; if the same condition is output as a fault, it must be acknowledged immediately.
Does A33442 stop the drive?
No, as an alarm it does not switch the drive off and does not have to be acknowledged. Depending on the drive configuration, the same condition can also appear as a fault.
Why does the encoder have a battery?
When the drive is switched off, the encoder uses the battery to back up the multiturn information. A33442 warns that this buffering will fail if the battery voltage keeps dropping.
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