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Example circuits
A.4 3RW55 Failsafe soft starter
Basic configuration for SIL 3
①
②
③
④
⑤
⑥
⑦
⑧
F‑DI
F‑RQ
M
Q1
Q2
358
EMERGENCY STOP mushroom pushbutton 3SU1 for stopping operation
Pushbutton 3SU1 for enabling the safety function
3RW55 Failsafe soft starter
3RT20 contactor
Motor
Mirror contact
PROFINET (via 3RW5 PROFINET communication module)
Safety control
Failsafe digital input
Failsafe signaling output (output 41, 42; output 4)
Ground
Safety-related output
Safety-related output
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
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