What it means
A33700 is the alarm Encoder 3: Effectivity test does not supply the expected value
. The drive raises it when the DRIVE-CLiQ encoder fault word for the encoder connected as Encoder 3 supplies fault bits that have been set — the effectivity test in the encoder did not supply the expected value. The alarm value stored in r2124, read in binary, shows which effectivity test is meant: bit x = 1 means effectivity test x was unsuccessful.
Why it appears
- The DRIVE-CLiQ encoder fault word for the encoder connected as Encoder 3 supplies fault bits that have been set — in the alarm value r2124, each bit set to 1 marks an effectivity test that was unsuccessful.
What to check
- Read the alarm value in r2124 and interpret it in binary: bit x = 1 means effectivity test x was unsuccessful, so the pattern shows which test or tests are flagged.
- Replace the encoder — the manual gives encoder replacement as the only remedy for this alarm.
Reading the message value
- The drive puts the alarm value r2124 into the message value and outputs it in binary; the manual prints the placeholder as
Fault cause: %1 bin
. - Decoding:
Bit x = 1: Effectivity test x unsuccessful.
Parameters the manual names
- r2124 (alarm value) — holds the value of this alarm; interpret it in binary, where bit x = 1 marks the effectivity test x that was unsuccessful.
Acknowledging and restarting
This alarm requires no acknowledgment — the drive neither trips nor needs a reset step for this message. The corrective action is to replace the encoder as described above.
The same on every family
Every manual that describes A33700 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) | Sensor Module Encoder 3 | SINAMICS S120, S150 List Manual · p. 3164 |
| G130, G150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Sensor Module Encoder 3 | SINAMICS G130, G150 List Manual · p. 1835 |
The drives this code lives on
A33700 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 alarm A33700 mean on a SINAMICS drive?
It is the alarm Encoder 3: Effectivity test does not supply the expected value — the DRIVE-CLiQ encoder fault word for the encoder connected as Encoder 3 contains fault bits that have been set. The alarm value r2124 shows in binary which effectivity test was unsuccessful.
How do I clear A33700?
Replace the encoder — that is the only remedy the manual gives. The alarm itself requires no acknowledgment, so there is no extra reset step.
Which effectivity test failed when A33700 appears?
Interpret the alarm value r2124 in binary: bit x = 1 means effectivity test x was unsuccessful, so the set bits show the tests that did not pass.
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