7
Operating Instructions
Safety Switch STA…EX
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!
f
The actuator must not be under tensile stress
during manual release.
f
After use, reset the auxiliary release and screw
in and seal the locking screw (e.g. with sealing
lacquer).
Mounting
WARNING
Danger of explosion due to improper mounting
and use.
f
Do not operate the switch in an atmosphere
containing combustible gases, such as:
‑ Carbon disulfide
‑ Carbon monoxide
‑ Ethylene oxide
f
Protection of the switch and actuator against
material deposits.
f
Protection against mechanical effects on the
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 com‑
pletely covered (no shock protection).
f
Actuators with rubber bushes must not be used.
f
An energy of 500 J must not be exceeded during
insertion of the actuator. Observe the max. ap‑
proach speed (see technical data) and the mass
of the guard.
NOTICE
Device damage due to improper mounting and
unsuitable ambient conditions
f
Safety switches and actuators must not be used
as an end stop.
f
Observe EN ISO 14119:2013, sections 5.2 and
5.3, and DIN EN 1127‑1:2011, Annex A, for
information about fastening the safety switch
and the actuator.
f
Observe EN ISO 14119:2013, section 7, for
information about reducing the possibilities for
bypassing an interlocking device.
f
Protect the switch head against damage, as well
as penetrating foreign objects such as swarf,
sand and blasting shot, etc.
Changing the actuating direction
B
D
C
A
Figure 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.
f
Please observe the following notes to avoid
electrostatic charging:
‑ All exposed ground connections must have
a conductor cross‑section of at least 4 mm².
‑ The following components must be grounded:
‑ Switch/protective plate
‑ Actuator
‑ Lockout mechanism
f
Seal unused cable entries using enclosed locking
screws and tighten to 5 Nm. Locking screws are
not allowed to be greased.
f
In order to achieve the indicated explosion
protection, the supplied 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. Inadequate tightening or
excessive tightening of the connection thread
or the domed nut can degrade the discharge
type, the sealing or the strain relief.
f
The connecting cable must be laid such that it is
protected against mechanical damage.
WARNING
Loss of the safety function due to incorrect
connection.
f
Use only safe contacts ( and ) for safety
functions.
f
When choosing the insulation material and
wire for the connections, pay attention to the
required temperature resistance and the max.
mechanical load!
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 Figure 3).
Use of the safety switch as guard locking for
process protection
At least one contact must be used. Contacts
with the symbol can also be used (for terminal
The following information applies to devices
with cable entry:
1. Use a suitable tool to open the desired inser‑
tion opening.
2. Fit the supplied cable gland (M20 x 1.5). Pay
attention to the clamping range!
3. Connect and tighten the terminals with 0.5 Nm
(for terminal assignment, see Figure 3).
4. Check that the cable entry is sealed.
5. Close the switch cover and fit the protective
plate (tightening torque 1.5 Nm).
Function test
WARNING
Fatal injury due to faults during the function test.
f
Before carrying out the function test, make sure
that there are no persons in the danger zone.
f
Observe the valid accident prevention regula‑
tions.
Check the device for correct function after installa‑
tion and after every fault.
Proceed as follows:
Mechanical function test
The actuator must slide easily into the actuating
head. Close the guard several times to check the
function. The function of any manual releases (except
for the auxiliary release) must also be tested.
Electrical function test
1. Switch on operating voltage.
2. Close all guards and activate guard locking.
¨
¨
The machine must not start automatically.
¨
¨
It must not be possible to open the guard.
3. Start the machine function.
¨
¨
It must not be possible to release guard locking
as long as the dangerous machine function is
active.
4. Stop the machine function and release guard
locking.
¨
¨
The guard must remain locked until there is no
longer any risk of injury (e.g. due to movements
with overtravel).
¨
¨
It must not be possible to start the machine
function as long as guard locking is released.
Repeat steps 2 ‑ 4 for each guard.
Inspection and service
WARNING
Danger of severe injuries due to the loss of the
safety function.
f
If damage or wear is found, the complete switch
and actuator assembly must be replaced. Re‑
placement of individual parts or assemblies is
not permitted.
f
Check the device for proper function at regular
intervals and after every fault. For informa‑
tion about possible time intervals, refer to
EN ISO 14119:2013, section 8.2.
f
Do not open, service or repair in an area in
which a potentially explosive atmosphere may
be present.
f
Switches and actuators must be regularly freed
of dirt and cleaned.
f
Avoid electrostatic charging – clean only with a
damp cloth!
Inspection of the following is necessary to ensure
trouble‑free long‑term operation:
f
correct switching function
f
secure mounting of all components
f
damage, heavy contamination, dirt and wear
f
sealing of cable entry
f
loose cable connections or plug connectors.
Information
: The year of manufacture can be seen
in the bottom, right corner of the type label.
