Siemens SIRIUS 3RW55 Equipment Manual page 355

Soft starters and solid-state switching devices

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SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters

Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006

Difference to the wiring in chapter EMERGENCY STOP shutdown to SIL 3 STO with a 3RW55 Failsafe

soft starter without coupling of the digital input DI to the failsafe digital input F-DI (Page 347). In

this example of a circuit, terminal M has to be connected to L- because digital input DI1 is supplied

with external voltage (L+).

Example circuits

A.4 3RW55 Failsafe soft starter

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Sirius 3rw55 failsafe