Description
3.5 Functions
SIRIUS 3RM1 motor starter
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Manual, 06/2016, A5E0345285095020A/RS-AE/005
3.5.4.1
Safety-related shutdown via the control supply voltage
Direct link to the 3SK safety relay
To ensure safety-related shutdown via the control supply voltage, you can directly connect
up to 5 motor starters to the 3SK safety relay via the device connector. In this case, the 24 V
DC control supply voltage is supplied via the device connector. In a safety case, the
3RM11/3RM13 Failsafe motor starters will be shut down by removal of the control supply
voltage by the 3SK safety relay. No additional wiring is required between the 3SK safety
relay and the 3RM1 motor starter. Nothing may be connected to terminals A1 and A2 of the
3RM1 motor starters.
WARNING
Loss of the safety function when using device connectors.
Can cause death or serious injury.
When operating with a 3SK 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.
Note
The device connector can only be used in combination with motor starters that have a 24
V DC supply voltage.
Wire connection to a safe output
Shutdown of the 3RM11 / 3RM13 Failsafe motor starter by removal of the control supply
voltage can also be performed by wiring to a safe output of a fail-safe control / evaluation
unit. This method can be used to shut down a single motor starter or a group of up to 5
motor starters safely. For safe group shutdown, the 3RM11 / 3RM13 Failsafe motor starters
are connected to each other via the device connector. In this case, the control supply voltage
is wired from the safe output to the first motor starter in the group.