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 - Siemens SIRIUS 3RW55 Equipment Manual

Wiring with the 3RW55 Failsafe soft starter
The example shows the 3RW55 Failsafe soft starter with a Standard circuit.
S1
S2
S3
Q1
Q11
M1
P1
PE
A.4.2 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
Together with an additional motor contactor connected between the 3RW55 Failsafe soft starter
and motor, two-channel STO applications can be implemented with the 3RW55 Failsafe soft
starter up to integrity level SILCL 3 according to IEC 62061 and PL e / Cat. 4 according to
EN ISO 13849‑1 (two-channel shutdown using the 3RW55 Failsafe soft starter in one of the two
channels). The safe signaling output (F‑RQ) of the 3RW55 Failsafe soft starter and the auxiliary
contacts of the contactor are monitored by a higher-level safety relay with SIL ≥ 2 (e.g. 3SK1).
The control commands at the failsafe digital input F‑DI of the 3RW55 Failsafe soft starter and at
the contactor come from 2 failsafe outputs of the higher-level safety relay.
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
Switch: Start/stop
Pushbutton: EMERGENCY OFF
Pushbutton: Reset
Motor starter protector
3RW55 Failsafe soft starter
Motor
Indicator light
Protective conductor
Example circuits
A.4 3RW55 Failsafe soft starter
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