What it means
F01978 reports that the shutdown threshold for the overtemperature of the Communication Board Ethernet 41 (CBE41) was reached. As a consequence the component is shut down, so communication via CBE41 is no longer possible. Depending on the drive configuration, the same condition can also be signalled as an alarm (A) or as a message without any reaction (N); in those cases the drive takes no automatic action and no acknowledgement is needed.
Why it appears
- The CBE41 reached its overtemperature shutdown threshold.
What to check
- Switch the Control Unit off, wait a while and switch it on again.
- Check the air intake for the Control Unit.
- Check the Control Unit fan.
- Replace the component if the fault occurs again.
Parameters the manual names
- r8828 — CBE41 temperature: the parameter the manual points to for this fault; read it to see how hot the Communication Board Ethernet 41 currently is.
Acknowledging and restarting
To clear the fault the drive must be powered off and on again. This is also the first step of the remedy: switch off the Control Unit, wait, and switch it on again. If the fault occurs again after the air intake and the fan have been checked, the component must be replaced.
The same on every family
Every manual that describes F01978 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF2 (OFF1) Servo: OFF3 (IASC/DCBRK, NONE, OFF1, OFF2, STOP2) Vector: OFF3 (IASC/DCBRK, NONE, OFF1, OFF2, STOP2) Hla: OFF3 (NONE, OFF1, OFF2, STOP2) | POWER ON | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2722 |
The drives this code lives on
F01978 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F01978 mean on my SINAMICS?
It reports that the overtemperature shutdown threshold of the Communication Board Ethernet 41 (CBE41) was reached. The component then shuts down and communication via CBE41 is no longer possible.
How do I clear F01978?
Switch the Control Unit off, wait a while and switch it on again. If the fault occurs again after checking the Control Unit air intake and fan, the component must be replaced.
Can I see how hot the CBE41 is?
Yes, r8828 (CBE41 temperature) shows the current temperature of the board. The manual references this parameter directly for this fault.
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