Emergency Stop Shutdown To Sil 1 Or Pl C With A 3Sk1 Safety Relay - Siemens SIRIUS 3RW51 Equipment Manual

Q21
P1
M1
PE
A.3.3

EMERGENCY STOP shutdown to SIL 1 or PL c with a 3SK1 safety relay

The 3RW51 soft starter has no effect or influence on the safety function of the application. For
this reason, it is neither positively nor negatively considered in the safety application, and also
does not have to be included in the calculation for proof according to the standards.
If achievement of SILCL 1 according to IEC 62061:2005 / PL c according to EN ISO 13849‑1:2015
is required, the series connection of an additional contactor with the 3RW51 soft starter, in
conjunction with a suitable safety relay (e.g.: 3SK1111), is required, as well as monitoring of the
contactor's auxiliary contacts.
Basic configuration
①
②
③
④
⑤
⑥
SIRIUS 3RW51 Soft Starter
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
External bypass contactor
Indicator light, fault
Motor
Protective conductor
Emergency stop
3TS contactor
3RW51 soft starter
3TS contactor
Motor
3SK1 safety relay
Example circuits
A.3 Special applications
189