User Manual

3SU12 compact units
6.1 Overview
SIRIUS ACT 3SU1 pushbuttons and signaling devices
126 System Manual, 02/2015, A5E03457306020A/RS-AB/002
A function test must be carried out before commissioning. The following properties must be
checked in the function test:
● Simultaneous actuation (use of both hands)
● Synchronous actuation (synchronism ≤ 500 ms)
● Relationship between input signals and output signals
● Renewed generation of the output signal
For further information refer to Chapters "Installation (Page 126)", "Two-hand operation
console (Page 159)" and "Application examples (Page 265)".
6.1.2.1
Mounting
Systems designed for the installation and commissioning of the sensor switch must comply
with the requirements of EN 574: 2008.
Prevention of accidental actuation and defeat (please also read EN 574, Section 8)
The sensor switches for a two-hand control circuit must be arranged according to the risk
assessment for the individual application in such a way that the protective effect of the two-
hand control circuit cannot be defeated. The probability of accidental actuation must be
minimized. The use of a single hand, possible combinations of one hand and/or other parts
of the body and/or the use of simple aids which would allow the protective circuit to be
defeated must be taken into consideration so that there is no possibility that persons can
enter the hazard zone when hazards exist. Accidental actuation (e.g. by the operator's
clothing) must also be taken into account.
The following measures as defined by standard
EN 574: 2008
must be implemented:
● Prevention of protective circuit defeat by one hand
– Spatial separation between control actuating devices (clearance) of at least 260 mm
● Prevention of defeat by hand and elbow of the same arm
– Spatial separation between control actuating devices (clearance) of at least 550 mm.
This clearance should not exceed 600 mm for ergonomic reasons
● Prevention of defeat by one hand and any other part of the body (e.g. knee, hip)
– Arrangement of control actuating devices on a horizontal surface at a distance of at
least 1100 mm above the floor or the access level.
The sensor switches should not be installed in an exposed location (i.e. without operation
console or protective cover for switch) so as to prevent accidental actuation of the switch by
falling objects.