What it means
F07968 is raised when a fault occurs during the Lq-Ld measurement. The drive stores a fault value in r0949, to be interpreted as a decimal number; that value tells you which condition ended the measurement and therefore which of the remedies below applies.
Why it appears
- A fault has occurred during the Lq-Ld measurement; the specific condition is given by the fault value in r0949 (see the fault value list).
What to check
- Read the fault value in r0949 and interpret it as a decimal number; the following checks depend on the value.
- Fault value 10 (Stage 1: ratio between the measured current and zero current too low): check whether the motor is connected correctly; replace the power unit involved; deactivate the technique via p1909.
- Fault value 12 (Stage 1: maximum current exceeded): check whether the motor data have been entered correctly; deactivate the technique via p1909.
- Fault value 15 (second harmonic too low): the manuals specify no remedy for this value.
- Fault value 16 (drive converter too small for the measuring technique): deactivate the technique via p1909.
- Fault value 17 (abort due to pulse inhibit): repeat the technique.
Reading the message value
- 10 — Stage 1: the ratio between the measured current and zero current is too low.
- 12 — Stage 1: the maximum current was exceeded.
- 15 — second harmonic too low.
- 16 — drive converter too small for the measuring technique.
- 17 — abort due to pulse inhibit.
Parameters the manual names
- r0949 (fault value) — read the stored value here and interpret it as a decimal number to see which condition ended the Lq-Ld measurement.
- p1909 (Data identification without enabling activation) — use it to deactivate the technique; this is the specified remedy for fault values 10, 12 and 16.
Acknowledging and restarting
The drive coasts down (OFF2 reaction) and must be acknowledged before it will restart; acknowledgement is specified as immediate. Eliminate the cause, acknowledge the fault and start the drive again.
What differs between the drive families
Straight from the manuals' own fields — F07968 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2894 |
| G130, G150 | OFF2 | IMMEDIATELY | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS G130, G150 List Manual · p. 1621 |
| G120 | OFF2 | IMMEDIATELY | Error in the parameterization / configuration / commissioning procedure (18) | — | SINAMICS G120 · p. 892 |
| G120XA | OFF2 | IMMEDIATELY | — | — | SINAMICS G120XA PN converter · p. 1141 |
The drives this code lives on
F07968 is described for G120, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does SINAMICS fault F07968 mean?
The drive has detected a fault during the Lq-Ld measurement. The fault value stored in r0949, read as a decimal number, shows which condition ended the measurement.
How do I fix fault F07968?
It depends on the fault value in r0949. For 10: check whether the motor is connected correctly, replace the power unit involved, and deactivate the technique via p1909. For 12: check that the motor data have been entered correctly and deactivate the technique via p1909; for 16: deactivate the technique via p1909; for 17: repeat the technique.
What is fault value 10 of F07968?
Stage 1 of the measurement ended because the ratio between the measured current and zero current was too low. The remedies given are to check whether the motor is connected correctly, to replace the power unit involved, and to deactivate the technique via p1909.
How is F07968 acknowledged?
The drive coasts down with an OFF2 reaction and the fault is acknowledged immediately. Once the cause has been eliminated and the fault acknowledged, the drive can be restarted.
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 F07xxx group · SINAMICS manuals · Siemens manuals