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Operating Instructions
Safety Switch TK...
Correct use
Safety switches series TK are interlocking devices
with a guard locking pin.
Safety switches TK do not have a prevention of inad-
vertent locking position (faulty closure protection).
This must be implemented separately.
In combination with a movable guard and the ma-
chine control, this safety component prevents the
guard from being opened while a dangerous machine
function is being performed.
The position of the guard must be monitored for this
purpose, e.g. with another safety switch.
This means:
Starting commands that cause a dangerous ma-
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chine function must become active only when the
guard is closed and locked.
The guard locking must not be unlocked until the
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dangerous machine function has ended.
Closing and locking a guard must not cause auto-
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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
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EN ISO 12100
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IEC 62061
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Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
EN ISO 13849-1
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EN ISO 14119
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EN 60204-1
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Important!
The user is responsible for the proper integration
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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
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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
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possible up to PL d in certain circumstances.
More information about this is available in
ISO TR 24119.
If a product data sheet is included with the prod-
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uct, the 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 fulfill
a personnel protection function.
Safety components must not be bypassed,
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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,
section 7.
Prevent bypassing by means of replacement
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keys. For this purpose, restrict access to keys
for releases.
Mounting, electrical connection and setup only
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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
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contact with inflammable material.
Function
The safety switch permits the locking of movable
guards.
The guard locking pin is extended on the activation
of the guard locking. Guard locking is achieved by
the insertion of the guard locking pin into a recess
on the safety door frame, for example (see Figure 1).
min. 2 mm
Figure 1: Locked safety switch TK
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 locking monitoring
All versions feature at least one safe contact for
monitoring guard locking. The contacts
opened when guard locking is released.
Version TK1
(Guard locking actuated by spring force and released
by power-ON)
Activating guard locking: close guard, disconnect
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voltage from the solenoid
Releasing guard locking: apply voltage to the
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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.
4
Version TK2
(Guard locking actuated by power-ON and released
by spring force)
Important!
Use as guard locking for personnel protec-
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
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solenoid
Releasing guard locking: disconnect voltage from
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the solenoid
The magnetically actuated guard locking operates in
accordance with the open-circuit current principle. If
the voltage at the solenoid is interrupted, 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 Figure 2. All available switching elements
are described there.
Guard not locked
TK1 and TK2:
The safety contacts
are open.
Guard locked
TK1 and TK2:
The safety contacts
are closed.
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 with triangular
wedge
In the event of malfunctions, the guard locking can
be released with the auxiliary release irrespective of
the state of the solenoid (see Figure 3).
The contacts
are opened when the auxiliary
release is actuated. A stop command must be
generated with these contacts.
Insert triangular key into the release on the switch
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head and turn against the locking direction.
Guard locking is released.
¨
Important!
are
The guard locking auxiliary release does not
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possess a resetting device in accordance with
EN ISO 14119. Additional measures at the control
system level are required to achieve this.
Contact separation
Important!
The guard locking pin must not be under tensile
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stress during manual release.
If there are malfunctions, the contacts
opened with contact separation. A stop command
must be generated with these contacts.
Actuating contact separation
1. Unscrew locking screw.
2. Using a screwdriver, turn the contact separa-
tion to
in the direction of the arrow.
The contacts are opened.
¨
Important!
The guard locking is not unlocked!
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After use, reset the contact separation and
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screw in and seal the locking screw (e.g. with
sealing lacquer).
can be
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