What it means
F01950 reports an unsuccessful synchronization in PB/PN clock cycle synchronous operation: the drive could not synchronize its internal clock cycle to the global control telegram, and the internal clock cycle shows an unexpected shift. Depending on how the drive is configured, the same condition can also be output as an alarm (A) or as a message without a reaction (N).
Why it appears
- The drive could not synchronize its internal clock cycle to the global control telegram.
- The internal clock cycle shows an unexpected shift.
What to check
- There are no on-site checks for this message: the manual's remedy is
Only for internal Siemens troubleshooting
, and no parameters are listed for it.
Acknowledging and restarting
As a fault, this message stops the drive with an OFF1; acknowledge it immediately so that the drive can be started again. If the acknowledgment does not remove the message, switch the drive's power supply off and on again (POWER ON). When the condition is output as an alarm (A) or as a message without a reaction (N), it causes no reaction and requires no acknowledgment.
The same on every family
Every manual that describes F01950 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | OFF1 (NONE) | IMMEDIATELY (POWER ON) | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1495 |
| S120, S150 | OFF1 (NONE) | IMMEDIATELY (POWER ON) | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2719 |
The drives this code lives on
F01950 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 F01950 mean on a SINAMICS drive?
The drive could not synchronize its internal clock cycle to the global control telegram during PB/PN clock cycle synchronous operation; the internal clock cycle shows an unexpected shift.
How do I clear fault F01950?
Acknowledge the message immediately — the drive only restarts once the message has been acknowledged. If the acknowledgment does not clear it, switch the drive's power supply off and on again (POWER ON).
Is there an on-site remedy for F01950?
No. The manual's remedy is <q>Only for internal Siemens troubleshooting</q>, so no checks or parameters are published for this message.
Can F01950 also appear as an alarm?
Yes. Depending on the drive's configuration, the same condition can also be output as an alarm (A) or as a message without a reaction (N); in those variants it causes no reaction and needs no acknowledgment.
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