What it means
F40851 is raised when a DRIVE-CLiQ communications error occurs on the path from the CX32 controller extension involved to the Control Unit: the DRIVE-CLiQ component — the DRIVE-CLiQ Hub Module (Hub) — did not set the sign-of-life to the Control Unit. While the fault is active, the drive coasts down and will not restart until the fault has been acknowledged. The G130/G150 and S120/S150 manuals describe this fault identically.
Why it appears
- A DRIVE-CLiQ communications error has occurred on the connection from the CX32 controller extension involved to the Control Unit.
- The DRIVE-CLiQ component did not set the sign-of-life to the Control Unit.
- The manuals give one fault cause: 10 — the sign-of-life bit in the receive telegram is not set.
What to check
- Identify the component involved from the component number in the message value (see the fault value below).
- Upgrade the firmware of the component involved — the manuals name no other remedy for this fault.
Reading the message value
- The manuals print the message value as:
Component number: %1, fault cause: %2
— the drive enters the number of the component involved and the fault cause. - Coding in r0949/r2124:
0000yyxx hex
— yy is the component number, xx is the error cause. - For F40851 the fault cause is 10: the sign-of-life bit in the receive telegram is not set.
Parameters the manual names
- r0949 (fault value) — read the coded message value here: 0000yyxx hex gives the component number (yy) and the fault cause (xx) for F40851.
- r2124 (alarm value) — the manuals name this register alongside r0949 for the same coding of the message value.
Acknowledging and restarting
The drive coasts down. Acknowledge the fault immediately; the drive will only restart once the fault has been acknowledged. The manuals describe no further restart steps for this code.
The same on every family
Every manual that describes F40851 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | DRIVE-CLiQ Hub Module (Hub) | SINAMICS S120, S150 List Manual · p. 3284 |
| G130, G150 | OFF2 | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | DRIVE-CLiQ Hub Module (Hub) | SINAMICS G130, G150 List Manual · p. 1928 |
The drives this code lives on
F40851 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 F40851 mean on a SINAMICS drive?
A DRIVE-CLiQ communications error occurred from the CX32 controller extension involved to the Control Unit: the component did not set the sign-of-life to the Control Unit, i.e. the sign-of-life bit in the receive telegram is not set (fault cause 10).
How do I fix F40851?
The remedy the manuals give is to upgrade the firmware of the component involved; the component number in the message value (r0949) identifies it. Acknowledge the fault immediately.
What is stored in the F40851 fault value?
The value in r0949 (or r2124) is coded 0000yyxx hex: yy is the component number and xx the error cause — here 10, the unset sign-of-life bit in the receive telegram.
Why does the drive coast down with F40851?
The fault triggers an OFF2 coast-down, and the drive only restarts after the fault has been acknowledged.
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 F40xxx group · SINAMICS manuals · Siemens manuals