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Operating Instructions
Safety Switch STA-TW... (Twin)
Scope
These operating instructions are valid for all safety
switches STA-TW.... These operating instructions,
the document Safety information and maintenance
and any enclosed data sheet form the complete user
information for your device.
Supplementary documents
The overall documentation for this device consists
of the following documents:
Document title
Contents
(document number)
Safety information
Basic safety information
(2525460)
Operating instructions
(this document)
(2105875)
Declaration of con-
Declaration of conformity
formity
Any additions to the
Take any associated additions to
operating instructions
the operating instructions or data
sheets into account.
Important!
Always read all documents to gain a complete
overview of safe installation, setup and use of
the device. The documents can be downloaded
from www.euchner.com. For this purpose, enter
the doc. no. or the order number for the device
in the search box.
Correct use
Safety switches series STA-TW are interlocking
devices with guard locking solenoid (type 2). The
actuator has a low coding level. In combination
with a movable guard and the machine control, this
safety component prevents the guard from being
opened while a dangerous machine function is
being performed.
This means:
Starting commands that cause a dangerous ma-
f
chine function must become active only when the
guard is closed and locked.
The guard locking must not be released until the
f
dangerous machine function has ended.
Closing and locking a guard must not cause auto-
f
matic starting of a dangerous machine function.
A separate start command must be issued. For
exceptions, refer to EN ISO 12100 or relevant
C-standards.
Devices from this series are also suitable for process
protection.
Before the device is used, a risk assessment must
be performed on the machine, e.g. in accordance
with the following standards:
EN ISO 13849-1
f
EN ISO 12100
f
IEC 62061
f
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
EN ISO 13849-1
f
EN ISO 14119
f
EN 60204-1
f
Important!
The user is responsible for the proper integration
f
of the device into a safe overall system. For this
purpose, the overall system must be validated,
e.g. in accordance with EN ISO 13849-2.
If the simplified method according to section 6.3
f
of EN ISO 13849-1:2015 is used for determining
the Performance Level (PL), the PL might be re-
duced if several devices are connected in series.
Logical series connection of safe contacts is
f
possible up to PL d in certain circumstances.
More information about this is available in
ISO TR 24119.
If a data sheet is included with the product, the
f
information on the data sheet applies in case of
discrepancies with the operating instructions.
Safety precautions
WARNING
Danger to life due to improper installation or due
to bypassing (tampering). Safety components
perform a personnel protection function.
Safety components must not be bypassed,
f
turned away, removed or otherwise rendered
ineffective. On this topic pay attention in partic-
ular to the measures for reducing the possibility
of bypassing according to EN ISO 14119:2013,
www
section 7.
The switching operation must be triggered only
f
www
by actuators designated for this purpose.
Prevent bypassing by means of replacement
www
f
actuators. For this purpose, restrict access to
actuators and to keys for releases, for example.
Mounting, electrical connection and setup only
f
by authorized personnel possessing special
knowledge about handling safety components.
CAUTION
Danger due to high housing temperature at ambi-
ent temperatures above 40 °C.
Protect switch against touching by personnel or
f
contact with flammable material.
Function
Safety switches series STA-TW... (Twin) have two ac-
tuator heads. They permit the simultaneous locking
or unlocking of two movable guards.
Both actuators must be inserted in order to activate
guard locking.
In the switch head, there is a rotating cam that is
blocked/released by the guard locking pin.
The guard locking pin is moved on the insertion of
both actuators/the removal of one actuator and on
the activation/release of the guard locking. During
this process the switching contacts are actuated.
If the cam is blocked (guard locking active), the ac-
tuators cannot be pulled out of the switch head. For
design reasons, guard locking can be activated only
when the guard is closed (prevention of inadvertent
locking position (faulty closure protection)).
The safety switch is designed so that fault ex-
clusions for internal faults in accordance with
EN ISO 13849-2:2013, Table A4, can be assumed.
Guard lock monitoring
All versions feature at least one safe contact for
monitoring guard locking. The contacts
opened when guard locking is released.
Door monitoring contact
Versions STA-TW-3 and STA-TW-4 additionally feature
at least one door monitoring contact. Depending on
the switching element, the door monitoring contacts
can be either positively driven (contacts
positively driven.
The door monitoring contacts are actuated when
the guard is opened.
5
Version STA-TW-3
(guard locking actuated by spring force and released
by power-ON)
Activating guard locking: close guard; no voltage
f
at the solenoid
Releasing guard locking: apply voltage to the
f
solenoid
The spring-operated guard locking functions in ac-
cordance with the closed-circuit current principle. If
the voltage is interrupted at the solenoid, the guard
locking remains active and the guard cannot be
opened directly.
If the guard is open when the power supply is
interrupted and is then closed, guard locking is
activated. This can lead to persons being locked
in unintentionally.
Switching states
The detailed switching states for your switch can
be found in Fig. 3. All available switching elements
are described there.
Guard open
The safety contacts
Guard closed and not locked
The safety contacts
contacts
are open.
Guard closed and locked
The safety contacts
Selection of the actuator
NOTICE
Damage to the device due to unsuitable actuator.
Additionally pay attention to the door radius and
the mounting options (see Fig. 4).
The following versions are available:
Actuator S for safety switches without insertion
f
funnel.
Manual release
Some situations require the guard locking to be
released manually (e.g. malfunctions or an emer-
gency). A function test should be performed after
release.
More information on this topic can be found in the
standard EN ISO 14119:2013, section 5.7.5.1. The
device can feature the following release functions:
Auxiliary release
In the event of malfunctions, the guard locking can
be released with the auxiliary release irrespective
of the state of the solenoid.
are
The contacts
are opened when the auxiliary
release is actuated. A stop command must be
generated with these contacts.
Actuating auxiliary release
1. Unscrew locking screw.
2. Using a screwdriver, turn the auxiliary release
) or not
to
in the direction of the arrow.
Guard locking is released.
¨
Important!
The actuator must not be under tensile stress
f
during manual release.
To prevent tampering, the auxiliary release must
f
be sealed (with sealing lacquer, for example)
before the switch is set up.
The locking screw must be screwed back in and
f
sealed (with sealing lacquer, for example) after
mounting and after every use of the auxiliary
release. Tightening torque 0.5 Nm.
and
are open.
are closed. The safety
and
are closed.
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