3Sk1 Safety Relay Wired With 3Rm1 Failsafe Motor Starter - Siemens SIRIUS 3SK1 Manual

7.3.2

3SK1 safety relay wired with 3RM1 Failsafe motor starter

The 3RM13 Failsafe motor starter (230 V supply voltage) is connected to a 3SK1 safety
relay.
The two directions of rotation are switched on and off operationally via IN1 and IN2, e.g. with
separate switches.
Bypassing the safety function in the event of a fault in the case of 3RM11/3RM13 Failsafe
motor starters with 110 to 230 V AC/110 V DC control supply voltage
The control signal for the control inputs in the case of 3RM11/3RM13 Failsafe motor
starters with 110 to 230 V AC control supply voltage must come from A1. Otherwise, the
safety function is bypassed in the event of a fault. Thus, only relay outputs are admissible
when using a PLC.
Do not use a separate control voltage. Only use the relay outputs when using a PLC.
The control supply voltage (L1 and N) to the motor starters is deactivated by the 3SK1 safety
relay and the system is in a safe state.
Note
SILCL 3 in accordance with EN 62061, PL e/Cat. 4 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.
Note
A fuse must be fitted as short-circuit protection (4 A gL/gG) in the supply line to the supply
voltage of 3RM1 (L1).
SIRIUS 3SK1 safety relays
Manual, 06/2018, A5E02526190021A/RS-AD/004
7.3 Typical circuits of 3SK1 safety relays with 3RM1 Failsafe motor starters
WARNING
Circuit diagrams
133