Wiring of the 3SK1 safety relay SIL 1 without line contactor
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F2
Fuse
Q21
Contactor
S3
Start button
S4
EMERGENCY STOP
K1
3SK1111 safety relay
A.3.14
EMERGENCY STOP shutdown up to SIL 3 or PL e with a 3SK1 safety relay
without the 3RW55 Failsafe soft starter
The 3RW55 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.
Requirements
• 3RW55 soft starter
For the 3RW55 Failsafe soft starter, refer to chapter 3RW55 Failsafe soft starter (Page 343).
• If the soft stop function is set (stopping time setting element set to > 0 s) and the EMERGENCY
STOP circuit is tripped, a "Missing load" error message may be indicated on the 3RW55 soft
starter. Use Reset to reset the error message.
Example circuits
A.3 Special applications
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
339
