Description
3.5 Functions
SIRIUS 3RM1 motor starter
Manual, 11/2013, A5E0345285095020A/RS-AB/002
37
In the case of 3RM11/3RM13 Failsafe motor starters, the OFF state is defined as the safe
state. 3RM11/3RM13 Failsafe motor starters are self-monitoring in compliance with SILCL
3/PL e and therefore do not need to be monitored in the feedback circuit of the upstream
evaluation unit/control.
Failure of the safety function
Hybrid operation of 3RM10/3RM12 Standard motor starters with 3RM11/3RM13 Failsafe
motor starters in safety-related applications is not admissible.
Only ever use safety-related motor starters (3RM11 Failsafe and 3RM13 Failsafe) in safety-
related applications.
Possibilities of interfacing to safety relays/fail-safe controllers
In the case of shutdown by removal of the control voltage, interfacing can take place via the
device connector connected to the 3SK1 safety relay or by wiring a 3RM11/3RM13 Failsafe
motor starter to a safety-related output of a fail-safe controller/evaluation unit.
Several 3RM11/3RM13 Failsafe motor starters can also be connected via device connectors
to one another or can be wired as a group of up to five motor starters to one safety-related
output of a failsafe controller/evaluation unit.
The device connector can only be used in combination with motor starters that have a 24
V DC supply voltage.
Configuration with 3SK1 safety relay using device connectors
When interfaced to the 3SK1 safety relay with device connectors, the 3RM11/3RM13
Failsafe motor starters are shut down by removal of the control supply voltage (L+ and M) by
the 3SK1 safety relay. In this case, nothing may be connected to terminals A1 and A2 of the
3RM1 motor starters.
Bypassing the safety function when using device connectors
When operating with a 3SK1 safety relay and a device connector, the supply voltage for
3RM1 motor starters is established via the device connectors.
In this case, do not connect anything to terminals A1 and A2 of the 3RM1 motor starters, in
order to prevent bypassing of the safety function.
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