What it means
F36950 is raised when the DRIVE-CLiQ Hub Module (component: Terminal Board, TB) detects an internal software error. The drive reacts with OFF2, i.e. the pulses are cancelled and the motor coasts down. The condition is confined to the hub itself; the manuals describe it identically for the hub on SERVO and VECTOR drive objects and on VECTOR_G.
Why it appears
- An internal software error has occurred in the hub.
What to check
- Read the fault value in r0949 and note it, interpreting the value as a decimal number — it holds the information about the fault source, which is intended for internal Siemens troubleshooting.
- If required, upgrade the firmware in the DRIVE-CLiQ Hub Module to a more recent version.
- If the fault remains or comes back, contact Technical Support.
Reading the message value
- The drive stores the message value in r0949, to be interpreted as a decimal number: it contains information about the fault source. The manual states that this information is only for internal Siemens troubleshooting; no bit decoding is published.
Parameters the manual names
- r0949 — the fault value of this message: read it as a decimal number to obtain the information about the fault source of the hub software error (used for internal Siemens troubleshooting).
Acknowledging and restarting
This fault is acknowledged with POWER ON: switch the power supply of the drive off and on again to clear it. If F36950 reappears after re-powering, follow the remedy — upgrade the hub firmware to a more recent version or contact Technical Support.
The same on every family
Every manual that describes F36950 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 (NONE) | POWER ON | Hardware/software error (1) | Terminal Board (TB) | SINAMICS S120, S150 List Manual · p. 3259 |
| G130, G150 | OFF2 (NONE) | POWER ON | Hardware/software error (1) | Terminal Board (TB) | SINAMICS G130, G150 List Manual · p. 1921 |
The drives this code lives on
F36950 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 F36950 Hub: Internal software error mean?
The DRIVE-CLiQ Hub Module has reported an internal software error. The drive stores information about the fault source in r0949 (interpreted as decimal), which is meant only for internal Siemens troubleshooting.
How do I clear fault F36950?
It is acknowledged with POWER ON — power the drive down and back up. It cannot be cleared with a simple acknowledge from the operator panel.
How can F36950 be fixed?
If required, upgrade the firmware in the DRIVE-CLiQ Hub Module to a more recent version. If the fault persists, contact Technical Support and quote the fault value from r0949.
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 F36xxx group · SINAMICS manuals · Siemens manuals