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Operating Instructions
Safety Switch STA...EX
Safety switches with ATEX identification
marking from EUCHNER are not safety
devices as defined by the ATEX Directive.
The following components must be grounded:
Switch/protective plate
f
Actuator
f
Lockout mechanism
f
Actuators with rubber bushes must not be used.
It is essential the protective plate (conductive ESD
protective paint) is mounted as shock protection.
Within the stipulated operating temperature it is not
to be expected that the explosive atmosphere will
be drawn into the housing.
Explosion protection when using bolt
BTM-UNIP-S-TH
Only the bolt BTM-UNIP-S-TH-00-X-159951 may be
used as the optional bolt. Bolts with escape release
must not be used.
The bolt achieves the same explosion protection as
the safety switch STA-...-EX used in the combination.
Bolts are not subject to mandatory rating according
to the ATEX Directive and ATEX standards. The bolt
BTM-UNIP-S-TH-00-X-159951 has no ATEX rating.
However, the specifications of the ATEX Directive
and ATEX standards apply to bolts as well.
The bolt slide and switch bracket must be ground-
f
ed. The bolt slide must be fastened on a grounded
base material for this purpose.
The switch bracket must either be fastened on a
f
grounded base material or mounted on the switch
using M5 x 40 fixing screws.
In either case, the grounding terminal must be
f
connected to the protective plate of the switch.
Mechanical collisions must be avoided to prevent
f
sparking. For this purpose, the door must be
checked periodically for misalignment and must
be realigned if necessary.
In order to avoid sparking due to mechanically
f
generated sparks and friction, all movements at
the bolt must be performed at a maximum speed
of 1 m/s.
The energy must not exceed 20 J when the bolt
f
tongue is actuated.
To prevent electrostatic charging, do not subject
f
the bolt to any processes that generate a large
amount of charge.
Selection of the actuator
NOTICE
Damage to the device due to unsuitable actuator.
Make sure to select the correct actuator (see
f
table in Fig. 2).
Additionally pay attention to the door radius and
f
the mounting options (see Fig. 4).
Actuators with rubber bushes must not be used.
f
The following versions are available:
Actuator S...-SN for safety switches without
f
insertion funnel.
Actuator S...-LN for safety switches with 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.
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
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.
Mounting
WARNING
Danger of explosion due to improper mounting
and use.
Do not operate the switch in an atmosphere
f
containing combustible gases, such as:
- Carbon disulfide
- Carbon monoxide
- Ethylene oxide
Protection of the switch and actuator against
f
material deposits.
Protection against mechanical effects on the
f
switch:
- To achieve the indicated explosion protection,
it is essential the protective plate supplied is
mounted (ESD protective paint).
- Mount the switch so that the rear side is
completely covered (no shock protection).
Actuators with rubber bushes must not be used.
f
An energy of 500 J must not be exceeded during
f
insertion of the actuator. Observe the max.
approach speed (see technical data) and the
weight of the guard.
NOTICE
Device damage due to improper mounting and
unsuitable ambient conditions
Safety switches and actuators must not be used
f
as an end stop.
Observe EN ISO 14119:2013, sections 5.2 and
f
5.3, for information about mounting the safety
switch and the actuator.
Observe EN ISO 14119:2013, section 7, for
f
information about reducing the possibilities for
bypassing an interlocking device.
Protect the switch head against damage, as well
f
as penetrating foreign objects such as swarf,
sand and blasting shot, etc.
The specified IP degree of protection is applica-
f
ble only if the housing screws, cable entries and
plug connectors are properly tightened. Observe
the tightening torques.
The locking screw of the auxiliary release must
f
be sealed prior to setup (with sealing lacquer,
for example).
7
Changing the actuating direction
Fig. 1: Changing the actuating direction
1. Remove the screws from the actuating head.
2. Set the required direction.
3. Tighten the screws with a torque of 1.5 Nm.
4. Cover the unused actuating slot with the en-
closed slot cover.
Electrical connection
WARNING
Danger of explosion due to improper connection.
Please observe the following notes to avoid
f
electrostatic charging:
- All exposed ground connections must have a
conductor cross-section of 4 mm².
- The following components must be grounded:
- Switch/protective plate
- Actuator
- Lockout mechanism
Seal unused cable entries using enclosed screw
f
plugs and tighten to 2 Nm. Screw plugs are not
allowed to be greased.
In order to achieve the indicated explosion pro-
f
tection, the supplied ATEX cable gland must be
used. Observe the permissible cable diameter
(6.5 ... 12 mm)!
- The cable gland is approved only for hard-
wired cables and wires. The installer must
provide adequate strain relief.
- Protection against loosening is to be provided
with a locking nut or a suitable locking com-
pound. As the tightening torques depend on
the cables and wires used, the user must
define the torque. The cable gland and the
domed nut are to be firmly tightened. Inad-
equate tightening or excessive tightening of
the connection thread or the domed nut can
degrade the discharge type, the sealing or
the strain relief.
The connecting cable must be laid such that it is
f
protected against mechanical damage.
WARNING
Loss of the safety function due to incorrect
connection.
Use only safe contacts (
and
f
functions.
When choosing the insulation material and
f
wires for the connections, pay attention to the
required temperature resistance and the max.
mechanical load!
Strip the insulation from the ends of the individual
f
wires over a length of 6
±1 mm
contact.
Use of the safety switch as guard locking for
personnel protection
At least one contact
must be used. It signals
the guard locking state (for terminal assignment,
see Fig. 3).
C
D
A
B
) for safety
to ensure a safe
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