7
Operating Instructions
Safety Switch STP-TW…
(Twin)
Auxiliary key release with state
indication
Function as for auxiliary release.
Important!
f
The actuator must not be under tensile stress
during manual release.
The position of the guard locking is indicated in
the window.
Guard locking ready
for operation (pos. 1)
Guard locking
released (pos. 2)
Pos. 1
Pos. 2
Marking
Figure 1: Auxiliary key release and display
Emergency release
Permits opening of a locked guard from outside the
danger zone without tools.
Important!
f
It must be possible to operate the emergency
release manually from outside the protected
area without tools.
f
The emergency release must possess a mark-
ing indicating that it may be used only in an
emergency.
f
The actuator must not be under tensile stress
during manual release.
f
The release function meets all other requirements
from EN ISO 14119.
f
The emergency release meets the requirements of
Category B according to EN ISO 13849-1:2015.
The contacts
are opened when emergency
release is actuated. A stop command must be
generated with these contacts.
Wire front release (bowden)
Release via a pull wire. Depending on the type of
attachment, the wire front release can be used as
emergency release or escape release.
Important!
f
The wire front release meets the requirements of
Category B according to EN ISO 13849-1:2015.
f
The correct function depends on the laying of
the pull wire and on the attachment of the pull
handle, and this is the responsibility of the plant
manufacturer.
f
The actuator must not be under tensile stress
during manual release.
Mounting
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, for information about mounting 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.
f
The specified IP degree of protection is applicable
only if the housing screws, cable entries and plug
connectors are properly tightened. Observe the
tightening torques.
Changing the actuating direction
NOTICE
It is not possible to change the position of the
entire head unit.
Figure 2: 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 0.8 Nm.
4. Cover the unused actuating slot with the en-
closed slot cover.
Electrical connection
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 5).
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 plug connector:
f
Check that the plug connector is sealed.
The following information applies to devices
with cable entry:
Important!
f
The switch cover may be fitted only when the
guard is open.
1. Use a suitable tool to open the desired inser-
tion opening.
2. Fit the cable gland with the appropriate degree
of protection.
3. Connect and tighten the terminals with 0.5 Nm
(for terminal assignment, see Figure 5).
4. Check that the cable entry is sealed.
5. Close the switch cover and screw in place
(tightening torque 0.8 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.
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.
Info
: The year of manufacture can be seen in the
bottom, right corner of the type label.
Exclusion of liability and warranty
In case of failure to comply with the conditions for
correct use stated above, or if the safety regula-
tions are not followed, or if any servicing is not
performed as required, liability will be excluded and
the warranty void.
Notes about
The following information applies to devices
with cable entry:
For use and applications as per the requirements
of
, a copper wire for the temperature range
60/75 °C is to be used.
The following information applies to devices
with plug connector:
For use and applications as per the requirements of
, a Class 2 power supply according to UL1310
must be used. Connecting cables for safety switches
installed at the place of use must be separated
from all moving and permanently installed cables
and un-insulated active elements of other parts
of the system that operate at a voltage of over
150 V. A constant clearance of 50.8 mm must be
maintained. This does not apply if the moving cables
are equipped with suitable insulation materials that
possess an identical or higher dielectric strength
compared to the other relevant parts of the system.