What it means
F33125 signals that the signal level of encoder 3 — the root from A^2 + B^2, i.e. the combined amplitude of incremental tracks A and B — exceeds the permissible limit. The nominal signal level of the encoder must lie in the range 375 mV to 600 mV (500 mV -25/+20 %); the drive responds above 750 mV. For Sensor Modules for resolvers (e.g. SMC10) the nominal signal level is 2900 mV (2.0 Vrms) and the response threshold is above 3582 mV. On the G130/G150 the same condition is titled "Encoder 3: Amplitude error track A or B overcontrolled", and there it also occurs when the analog/digital converter is overcontrolled. Depending on how the drive is configured, the condition can also be issued as an alarm (A) or with no reaction (N).
Why it appears
- The signal level (root from A^2 + B^2) of encoder 3 exceeds the permissible limit value — the amplitude of track A or B leaves the tolerance band of 375 mV to 600 mV.
- On the G130/G150 the manual adds that this fault also occurs if the analog/digital converter is overcontrolled.
What to check
- Check that the encoder cables and shielding are routed in compliance with EMC.
- Replace the encoder or the encoder cable.
Reading the message value
- The fault value in r0949 is to be interpreted in hexadecimal as yyyyxxxx hex: yyyy = signal level, track B (16 bits with sign); xxxx = signal level, track A (16 bits with sign).
- Reference values: a signal level of 500 mV peak value corresponds to the numerical value 5333 hex = 21299 dec; for resolver Sensor Modules (e.g. SMC10), a signal level of 2900 mV peak value corresponds to 6666 hex = 26214 dec.
- The message value shows both tracks directly: "A track: %1, B-track: %2".
- Note: the analog values of the amplitude error are not measured at the same time with the hardware fault output by the Sensor Module.
Parameters the manual names
- r0949 — fault value; for F33125 read it in hexadecimal and split it into the signed 16-bit signal levels of track B (yyyy) and track A (xxxx).
Acknowledging and restarting
Once the cause has been eliminated, acknowledge the fault by removing the pulse inhibit, after which the drive can be started again. If the drive is configured to issue this condition only as an alarm or with no reaction, no acknowledgement is required.
What differs between the drive families
Straight from the manuals' own fields — F33125 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Servo: OFF1 (IASC/DCBRK, NONE, OFF2, OFF3, STOP2) Vector: OFF1 (IASC/DCBRK, NONE, OFF2, OFF3, STOP2) Hla: OFF1 (NONE, OFF2, OFF3, STOP2) | PULSE INHIBIT | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS S120, S150 List Manual · p. 3141 |
| G130, G150 | OFF1 (IASC/DCBRK, NONE, OFF2, OFF3, STOP2) | PULSE INHIBIT | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS G130, G150 List Manual · p. 1816 |
The drives this code lives on
F33125 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 fault F33125 mean on a SINAMICS drive?
The signal level of encoder 3 — the root from A^2 + B^2 of the incremental tracks — exceeds the permissible limit. The nominal level is 375 mV to 600 mV and the drive responds above 750 mV; for resolver Sensor Modules such as the SMC10 the threshold is above 3582 mV.
How do I read fault value r0949 for F33125?
Interpret it in hexadecimal as yyyyxxxx: yyyy is the signed 16-bit signal level of track B and xxxx that of track A. A 500 mV peak level corresponds to 5333 hex = 21299 dec, and a 2900 mV resolver level to 6666 hex = 26214 dec.
How do I clear F33125?
Check that the encoder cables and shielding are routed in compliance with EMC, then replace the encoder or the encoder cable. After the repair, acknowledge the fault by removing the pulse inhibit.
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 F33xxx group · SINAMICS manuals · Siemens manuals