Siemens SINAMICS G120X - Function Description; Prerequisites for SIL 2;PL D; Prerequisites for SIL 3;PL E; SIRIUS 3 SK1 Safety Relay

Prerequisites for SIL 2/PL d
● Suitable higher-level controllers
– SIRIUS 3SK1: Single-channel static feedback circuit
– SIRIUS 3SK2: Two-channel dynamic feedback circuit
– MSS 3RK3: Two-channel dynamic feedback circuit
– SIMATIC: Feedback circuit monitoring in the safety program
● Forced checking procedure (test stop) once per year
Prerequisites for SIL 3/PL e
● Suitable higher-level controllers
– SIRIUS 3SK1: Single-channel static feedback circuit
Permissible for converters FSH and FSJ, not permissible for FSA … FSG
– SIRIUS 3SK2: Two-channel dynamic feedback circuit
– MSS 3RK3: Two-channel dynamic feedback circuit
– SIMATIC: Feedback circuit monitoring in the safety program
● Forced checking procedure (test stop) every 3 months
Function description
SIRIUS 3SK1 safety relay
9'&
6WDUW
0
6.$%
$







$,1
,1
)6
7
,1
7
7
,1
7
$XWRVWDUW
0RQLWRUHG6WDUW
/RJLF
672B$
672B%
9
9
9
9
'21&
'2&20
'21&
'2&20
Figure 4-27 Connection 3SK1 inside a control cabinet for FSA … FSG
You can achieve SIL 2/PL d with a SIRIUS 3SK1 safety relay and the converter FSA … FSG.
Wiring
4.2 Control interfaces
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 133