14.4 Typical circuits of 3SK1 safety relays with 3RM1 Failsafe motor
starters
14.4.1 3SK1 safety relay with 3RM1 Failsafe motor starter via device connector
The 3RM13 Failsafe motor starter (24 V DC variant) is connected to a 3SK112 safety relay via a
3ZY12 device connector.
The two directions of rotation are switched on and o operationally via IN1 and IN2, e.g. with
a PLC.
The control supply voltage (L+ and L-) to the motor starters is deactivated by the 3SK112 safety
relay and the system is in a safe state.
Note
SILCL 3 in accordance with EN 62061/PL e in accordance with EN ISO 13849‑1
A safety-related application up to SILCL 3 to EN 62061, PL e/Cat. 4 to EN ISO 13849‑1 can be
realized in this way.
To achieve SILCL 3/PL e/Cat. 4 for the safety-related application, all components of the safety
functions (detecting/evaluating/reacting) must be designed accordingly.
WARNING
Bypassing the safety function when using device connectors
When operating with a 3SK112 safety relay and a device connector, the supply voltage for
3RM1 Failsafe motor starters is established via the device connectors.
In this case, do not connect anything to terminals A1 and A2 of the 3RM1 Failsafe motor starters
in order to prevent bypassing of the safety function.
Circuit diagrams
14.4 Typical circuits of 3SK1 safety relays with 3RM1 Failsafe motor starters
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
222 Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
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