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Operating Instructions
Safety Switches TZ...AS1
Correct use
EUCHNER safety switches series TZ...AS1 are
operated as slaves on the safety bus AS-Interface
Safety at Work and function as interlocking devices
with guard locking (type 2). The actuator has a low
coding level. In combination with a movable guard
and the machine control, this safety component
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 12100
f
IEC 62061
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
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 13849-2.
If the simplified method according to section 6.3
f
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
f
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-
f
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
perform a personnel protection function.
Safety components must not be bypassed,
f
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.
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.
A complete safety-oriented system generally
f
consists of several signaling devices, sensors,
evaluation units and concepts for safe shutdown.
The manufacturer of a machine or installation is
responsible for correct and safe overall function.
All safety precautions and requirements stated
f
in the operating instructions of the AS-Interface
safety monitor used must be observed.
2086963_08-09_21.mx.indb 7
2086963_08-09_21.mx.indb 7
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/
removal 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)).
Position monitoring of the guard and monitoring
of interlocking are performed via two separate
switching elements (door monitoring contact SK
and solenoid monitoring contact ÜK).
When the guard is closed and guard locking ef-
fective, each TZ...AS1 transmits a switch-specific,
unique safety code sequence with 8 x 4 bits via the
AS-Interface bus. This code sequence is evaluated
by an AS-Interface safety monitor. The positively
driven contact SK for door monitoring is represent-
ed by the AS-Interface input bits D0 and D1. The
solenoid monitoring contact ÜK is represented by
the AS-Interface input bits D2 and D3.
The safety switch must be correspondingly config-
ured in the AS-Interface safety monitor (refer to the
operating instructions of the AS-Interface safety
monitor used and the status table).
The safety switch is designed so that fault exclusions
for internal faults in accordance with EN ISO 13849
2:2013, Table A4, can be assumed.
Version TZ1...AS1
(guard locking actuated by spring force and released
by power-ON)
Important!
For the purpose of personnel protection against
dangerous over-traveling movements, the black
AS-Interface cable (auxiliary power) leading to the
AS-Interface distribution box to which the switch is
connected can additionally be switched via a stand-
still monitor or via the safe switch-on delay feature
of a dual-channel AS-Interface safety monitor (e.g.
door locking for duration of the time delay).
Activating guard locking: close guard; no voltage
f
at the solenoid and/or clear AS-Interface output
bit D0
Releasing guard locking: apply voltage to the
f
solenoid and set AS-Interface output bit D0
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.
7
Version TZ2...AS1
(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
f
solenoid and set AS-Interface output bit D0
Releasing guard locking: disconnect voltage from
f
the solenoid or clear AS-Interface output bit D0
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 and code sequences
for your switch can be found in the status table.
Selection of the actuator
NOTICE
Damage to the device due to unsuitable actuator.
Make sure to select the correct actuator.
Additionally pay attention to the door radius and
the mounting options (see Fig. 4).
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 half-sequence is sent with the auxiliary release
actuated.
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.
After use, reset the auxiliary release and screw in
f
and seal the locking screw (with sealing lacquer,
for example).
Auxiliary key release/auxiliary
release with triangular wedge
Function as for auxiliary release.
Important!
The actuator must not be under tensile stress
f
during manual release.
17.10.2021 12:20:45
17.10.2021 12:20:45
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