User Manual

Application examples
13.1 Examples of EMERGENCY STOP shutdown applications
SIRIUS ACT 3SU1 pushbuttons and signaling devices
266 System Manual, 02/2015, A5E03457306020A/RS-AB/002
Operating principle
The safety relay monitors the emergency stop device
on two channels. When the emergency stop device is
actuated, the sa
fety relay opens the enabling circuits
and switches the power contactors off in a safety
-
related way. If the emergency stop device is unlatched
and the feedback circuit is closed, the Start button can
be used to switch on again.
Safety-related components
Emergency stop device
Safety relay
Contactor
3SU1
3SK1
2x 3RT20
13.1.2
Emergency stop shutdown via AS-i with a Modular Safety System to SIL 3 or
PL e
Application
Monitoring of multiple emergency stop devices via AS-i with a 3RK3 Modular Safety System.