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Operating Instructions
Safety Switch STA...EX
Scope
These operating instructions are valid for all safety
switches STA...EX These operating instructions,
the document Safety information and any available
data sheet form the complete user information for
your device.
NOTICE
Make sure to use the operating instructions valid
for your product version. Please contact our
Service department if you have any questions.
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)
(2115582)
Declaration of con-
Declaration of conformity
formity
Take any associated additions to
Any additions to the
the operating instructions or data
operating instructions
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 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 compo-
nent 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 14119
f
EN 60204-1
f
EN 1127-1
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
EN 1127-1
f
EN IEC 60079-14
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 13849-1.
If the simplified method according to section
f
6.2.3 of EN ISO 13849-1:2023 is used for
determining the Performance Level (PL), the
PL might be reduced 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,
www
f
turned away, removed or otherwise rendered
ineffective. On this topic pay attention in partic-
www
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
by actuators designated for this purpose.
Prevent bypassing by means of replacement
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
The safety switch permits the locking of movable
guards.
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/re-
moval of the 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
actuator 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 STA3 and STA4 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.
6
Version STA3
(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.
Version STA4
(guard locking actuated by power-ON and released
by spring force)
Important!
Guard locking devices according to the open-cir-
f
cuit current principle are not intended for pro-
tecting personnel.
Use as guard locking for personnel protec-
f
tion is possible only in special cases, after
strict assessment of the accident risk (see
EN ISO 14119:2013, section 5.7.1)!
Activating guard locking: apply voltage to the
f
solenoid
Releasing guard locking: disconnect voltage from
f
the solenoid
The magnetically actuated guard locking operates in
accordance with the open-circuit current principle. If
the voltage is interrupted at the solenoid, the guard
locking is released and the guard can be opened
directly!
Switching states
The detailed switching states for your switch can
be found in Fig. 3. All available switching elements
are described there.
Guard open
STA3 and STA4:
The safety contacts
Guard closed and not locked
STA3 and STA4:
The safety contacts
contacts
are open.
Guard closed and locked
STA3 and STA4:
The safety contacts
Explosion protection safety concept
Important!
In order to achieve the explosion protection stated,
all the conditions in the operating instructions must
be met. HIGH RISK product.
are
II3G Ex nR IIB T4 Gc X
II3D Ex tc IIIC T110°C Dc X
...Gc X = There is no test port.
...Dc X = To prevent electrostatic charging, do not
subject the switch to any processes that generate
) or not
a large amount of charge.
and
are open.
are closed. The safety
and
are closed.
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