Siemens SIRIUS ACT 3SU1 - Page 573

Application examples
16.2 Examples of two-hand operation console applications
SIRIUS ACT 3SU1 pushbuttons and signaling devices
System Manual, 08/2018, A5E03457306020A/RS-AK/010
573
Operating principle
By imposing the condition of simultaneous pressing of
both pus
hbuttons, the operator is restricted to the two-
hand operation console and is thus unable to reach
into the danger zone. The Modular Safety System only
switches the enabling circuits when both signals are
active within 500 ms and the feedback circuit is
cl
osed.
If one of the two pushbuttons is released, the Modular
Safety System immediately switches the machine off
in a safety
-related manner.
The four
-channel design in the two-hand operation
console ensures that possible welding of one of the
contacts is de
tected immediately.
After the emergency stop device is actuated, the Start
button must be used to restart.
Safety-related components
Two-hand operation console
Modular Safety System
Contactor
3SU18
3RK3
2x 3RT20
You will find further information about the use of sensor switches in the two-hand operation
console (wiring to Siemens safety relays and safety design) in the following FAQs: Sensor
switches in the two-hand operation console
(https://support.industry.siemens.com/cs/document/109479531/Einsatz
)