3Rm1 Failsafe Motor Starters - Siemens SIRIUS 3SK1 Equipment Manual

5.3.7

3RM1 Failsafe motor starters

3RM1 Failsafe motor starters can be used wherever combinations of contactors and overload
relays were previously used.
3RM1 Failsafe motor starters are used in the following areas, for example:
• Conveyor technology
• Logistics systems
• Production machines
• Machine tools
• Small elevators
Thanks to the additional functionality of safety-related shutdown, the 3RM11 Failsafe and
3RM13 Failsafe motor starter variants are ideally suited to safety-related applications in the 3SK1
system up to SILCL 3 in accordance with IEC 62061 and PL e/Cat. 4 in accordance with ISO
13849-1.
The maximum achievable Performance Level PL/Cat. in accordance with ISO 13849-1, SILCL in
accordance with IEC 62061, SIL in accordance with IEC 61508 corresponds to the Performance
Level PL and SIL of the 3SK1 basic unit when the external wiring (connection between basic unit
and output expansion) is configured as fail-safe (e.g. basic unit and 3RM1 Failsafe motor starter
are connected using 3ZY12 device connector).
3RM1 Failsafe motor starters can be controlled via the supply voltage (A1/A2) or via 3ZY12
device connectors (24 V DC variant only).
Note
If expansion units are controlled via the 3ZY12 device connector, additional feeding of the
control supply voltage (A1/A2) at one of the output expansions leads to a fault in the system
configuration.
Note
In the configuration with a 3SK1 Advanced basic unit on a 3ZY12 device connector, 3RM1
Failsafe motor starters can only be controlled by the instantaneous enable signal of the 3SK1
unit. If control of the 3RM1 Failsafe motor starters by means of the time-delayed output is
desired, this can only be done by wiring the time-delayed safety-related output of the 3SK1 basic
unit.
More detailed technical information is available in the SIRIUS 3RM1 motor starters
support.automation.siemens.com/WW/view/en/66295730) manual on the Internet.
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
3SK1 / 3RQ1 devices
5.3 3SK1 output expansions
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