What it means
N01620 appears while the SI basic function Safe Torque Off (STO) is selected at an input terminal of the Control Unit (CU) and is active. In the G120 manual the wording is that STO was selected on processor 1 — this is the P1 of the title. Two notes accompany the code in the list manuals: this message does not result in a safety stop response
, and it is suppressed whenever STO is selected through the Extended Functions. Whether the drive outputs the condition as this message, as a fault or as an alarm follows from the drive configuration.
Why it appears
- Safe Torque Off (STO), one of the basic functions, is currently selected at the Control Unit (CU) through its input terminal.
- The G120 manual expresses the same situation as STO selected on processor 1 via the input terminal.
What to check
- No action is prescribed: the manual states that a remedy is not necessary for this message.
Acknowledging and restarting
There is nothing to acknowledge in this form: the manual's stated remedy is Not necessary
, and the drive raises the message without any safety stop response. If the configuration instead outputs the condition as a fault, the manual defines the response: the drive coasts down (OFF2) and the fault is acknowledged immediately, e.g. by POWER ON. As an alarm, too, there is no reaction and nothing to acknowledge.
What differs between the drive families
Straight from the manuals' own fields — N01620 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 2625 |
| G130, G150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1431 |
| G120 | NONE | NONE | Safety monitoring channel has identified an error (10) | — | SINAMICS G120 · p. 839 |
The drives this code lives on
N01620 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does N01620 mean on a SINAMICS drive?
It reports that Safe Torque Off (STO), a Safety Integrated basic function, is selected at the CU through its input terminal and is active. The manual's remedy for the message is that none is necessary.
Does N01620 stop the drive or trigger a safety response?
No — the manuals note that the message triggers no safety stop response. Only when the drive is configured to output the condition as a fault does the OFF2 coast-down response apply.
How do I acknowledge or clear N01620?
Nothing has to be acknowledged and no action is required; the manuals state the remedy is not necessary. The code simply accompanies the active STO selection at the input terminal.
Why is N01620 not displayed although STO is active?
Because the message is suppressed when STO comes from the Extended Functions; the manuals for S120/S150 and G130/G150 note that it appears only where the STO selection runs over the input terminal.
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 N01xxx group · SINAMICS manuals · Siemens manuals