Sensor Switches - Siemens SIRIUS ACT 3SU1 System Manual

3SU12 compact units
7.1 Overview
7.1.6

Sensor switches

Sensor switches are capacitive sensors that are actuated when the sensor surface is
touched by hand without the application of force or pressure. The sensor switch can be
actuated by someone wearing thin gloves. In this case, however, it might be necessary to
apply light pressure to the sensor surface.
Sensor switches are used to operate machines or as door opening switches and stop call
buttons. Thanks to the water-sealed electronic circuitry and rugged enclosure materials used
in their construction, these capacitive and fully electronic sensors are extremely durable.
Since sensor switches have no moving mechanical parts, they are maintenance-free. Two
integrated status display LEDs provide the user with visual feedback.
Sensor switches
Typical diagram
Application example
When the sensor switches are combined with the appropriate Siemens
DIN EN 574-compliant evaluation devices with type III C certificate (devices from the SIRIUS
3SK1 Advanced safety relay range or devices from the 3RK3 Modular Safety System
(MSS)), they can be deployed as a safety relay, for example, in two-hand control
applications. A two-hand control device requires simultaneous actuation with both hands in
order to start up a machine and to keep it in operation in a potentially risky situation. The
two-hand control device must be located outside the hazard zone (and the hazard zone must
be clearly visible) in order to prevent the operator from entering the zone before the machine
has reached a complete standstill.
The control command is sent by actuating both pushbuttons simultaneously within 0.5 s.
The following properties must be provided for mobile two-hand control devices:
● Stability
● The safety distance must be maintained between the control actuating devices and the
hazard zone
● In the case of adjustable control actuating devices, a latch must be available
The sensor switch provides effective shock protection. The operating surface of the sensor
switch is easy to clean (protection class IP 69).
158
Material Article number
Plastic / 3SU1200-1SK10-2SA0
Plastic (http://mall.industry.siemens.com/mall/en/WW/Catalog/Products/10221502)
SIRIUS ACT 3SU1 pushbuttons and signaling devices
System Manual, 08/2018, A5E03457306020A/RS-AK/010