What it means
F01951 (CU SYNC: Synchronization application clock cycle missing) means that a synchronization routine between the Control Unit and the connected DRIVE-CLiQ components did not complete. The manual describes the situation in which this happens: if DRIVE-CLiQ components with different application clock cycles are operated on a DRIVE-CLiQ port, this requires synchronization with the Control Unit — and that synchronization routine was unsuccessful. The manual for the G120 states the same condition more compactly as an unsuccessful internal synchronization of the application cycles.
Why it appears
- DRIVE-CLiQ components with different application clock cycles are operated on a DRIVE-CLiQ port; operating such a combination requires synchronization with the Control Unit.
- This synchronization routine was unsuccessful.
What to check
- Carry out a POWER ON (switch-off/switch-on) for all components.
- If a Controller Extension is being used (for example CX32 or NX10): check whether the Controller Extension is issuing error messages and, if required, remove these.
- Upgrade the software of the DRIVE-CLiQ components.
- Upgrade the Control Unit software.
Reading the message value
- The drive stores the fault value in r0949; the value is to be interpreted as a decimal number.
- The manual publishes no decoding for this value: it is intended only for internal Siemens troubleshooting.
Parameters the manual names
- r0949 — fault value: the parameter in which this code's fault value is stored (read it as a decimal number); the manual publishes no decoding of it for this code.
Acknowledging and restarting
The fault is cleared by switching all components off and on again — the manual's remedy reads: carry out a POWER ON (switch-off/switch-on) for all components
. The remedy further names two software steps, upgrading the software of the DRIVE-CLiQ components and upgrading the Control Unit software. Where a Controller Extension (for example CX32 or NX10) is used, any error messages it issues are to be removed.
What differs between the drive families
Straight from the manuals' own fields — F01951 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | OFF2 (NONE) | IMMEDIATELY (POWER ON) | Internal (DRIVE-CLiQ) communication error (12) | None | SINAMICS G130, G150 List Manual · p. 1495 |
| S120, S150 | OFF2 (NONE) | IMMEDIATELY (POWER ON) | Internal (DRIVE-CLiQ) communication error (12) | None | SINAMICS S120, S150 List Manual · p. 2719 |
| G120 | OFF2 (NONE) | IMMEDIATELY (POWER ON) | Internal (DRIVE-CLiQ) communication error (12) | — | SINAMICS G120 · p. 862 |
The drives this code lives on
F01951 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F01951 mean on a SINAMICS drive?
It reports that the synchronization of the application clock cycle was unsuccessful. DRIVE-CLiQ components with different application clock cycles on a DRIVE-CLiQ port must be synchronized with the Control Unit, and that routine failed.
How do I clear F01951?
Carry out a POWER ON, i.e. switch all components off and on again. The manual also names software upgrades of the DRIVE-CLiQ components and of the Control Unit as remedy steps.
Does F01951 have anything to do with a Controller Extension such as CX32 or NX10?
If a Controller Extension is being used, the manual says to check whether it is issuing error messages and, if required, to remove these.
Where is the fault value of F01951 stored?
In r0949, to be interpreted as a decimal number. The manual publishes no decoding of the value because it is intended only for internal Siemens troubleshooting.
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 F01xxx group · SINAMICS manuals · Siemens manuals