What it means
F40801 reports a DRIVE-CLiQ communications error from the Control Unit (CU) to the controller extension involved — the CX32. The cause logged with the fault is fault cause 10 (= 0A hex): the sign-of-life bit in the receive telegram is not set. The manuals describe the fault identically for the G130/G150 and the S120/S150, and it affects the Control Unit as the component concerned. The drive coasts down when the fault is raised and will not run again until it has been acknowledged.
Why it appears
- A DRIVE-CLiQ communications error has occurred from the Control Unit (CU) to the CX32 controller extension involved.
- Fault cause 10 (= 0A hex): the sign-of-life bit in the receive telegram is not set.
What to check
- Carry out a POWER ON (switch-off/switch-on).
- If the fault comes back, read the message value in r0949 or r2124 to identify which component reported the error (see the decoding below).
- If the fault persists after the power cycle, replace the component involved — the CX32 controller extension.
Reading the message value
- The drive codes the message value in r0949/r2124 as 0000yyxx hex.
- yy = component number (printed as %1, the component number).
- xx = error cause (printed as %2, the fault cause). For this fault the cause is 10 (= 0A hex): the sign-of-life bit in the receive telegram is not set.
Parameters the manual names
- r0949 (fault value): read the coded message value 0000yyxx hex here to see which CX32 component number and which error cause raised F40801.
- r2124 (alarm value): named by the manual alongside r0949 as the register in which the message value for this fault is coded.
- p9916 (DRIVE-CLiQ data transfer error shutdown threshold slave, DQ fault slave): the remedy entry for this DRIVE-CLiQ fault cross-references this shutdown threshold.
Acknowledging and restarting
The drive coasts down when this fault trips and must be acknowledged immediately before it will restart. The remedy itself clears the fault in most cases: a POWER ON (switch-off/switch-on). If F40801 returns after the power cycle, replace the CX32 component involved and acknowledge the fault again.
The same on every family
Every manual that describes F40801 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | OFF2 | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1925 |
| S120, S150 | OFF2 | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 3281 |
The drives this code lives on
F40801 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 F40801 mean on a SINAMICS drive?
It signals a DRIVE-CLiQ communications error from the Control Unit (CU) to the CX32 controller extension: fault cause 10 (= 0A hex), the sign-of-life bit in the receive telegram is not set.
How do I clear fault F40801?
Carry out a POWER ON (switch-off/switch-on). If the fault returns, replace the component involved — the CX32 controller extension.
How can I tell which component raised F40801?
Read the message value in r0949 or r2124. It is coded 0000yyxx hex: yy gives the component number and xx the error cause.
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