5
Operating Instructions
Safety Switch TQ…
Correct use
Safety switches series TQ are interlocking devices
with guard locking (with separate actuator) for
process protection without guard lock monitoring.
The actuator has a low coding level. In combination
with a movable safety guard and the machine
control, this safety component prevents dangerous
machine functions from occurring while the safety
guard is open. A stop command is triggered if
the safety guard is opened during the dangerous
machine function.
This means:
f
Starting commands that cause a dangerous ma-
chine function must become active only when the
safety guard is closed.
f
Opening the safety guard triggers a stop com-
mand.
f
Closing a safety guard must not cause automatic
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 suitable only 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:
f
EN ISO 13849-1, Safety of machinery – Safety-re-
lated parts of control systems – Part 1: General
principles for design
f
EN ISO 12100, Safety of machinery – General
principles for design – Risk assessment and risk
reduction
f
IEC 62061, Safety of machinery – Functional
safety of safety-related electrical, electronic and
programmable electronic control systems
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
f
EN ISO 13849-1, Safety of machinery – Safety-re-
lated parts of control systems – Part 1: General
principles for design
f
EN ISO 14119 (supersedes EN 1088), Safety of
machinery – Interlocking devices associated with
guards – Principles for design and selection
f
EN 60204-1, Safety of machinery – Electrical
equipment of machines – Part 1: General re-
quirements
Important!
f
The user is responsible for the proper integration
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.
f
If the simplified method according to section 6.3
of EN ISO 13849-1:2008 is used for determining
the Performance Level (PL), the PL might be re-
duced if several devices are connected in series.
f
Logical series connection of safe contacts is
possible up to PL d in certain circumstances.
More information about this is available in
ISO TR 24119.
f
If a product data sheet is included with the prod-
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 personal protection function.
f
Safety components must not be bypassed,
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.
f
The switching operation must be triggered only
by actuators designated for this purpose.
f
Prevent bypassing by means of replacement
actuators. For this purpose, restrict access to
actuators and to keys for releases, for example.
f
Mounting, electrical connection and setup only
by authorized personnel possessing special
knowledge about handling safety components.
CAUTION
Danger due to high housing temperature.
f
Protect switch against touching by personnel or
contact with inflammable material.
Function
The safety switch permits the locking of movable
safety guards for process protection.
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 safety guard is closed (failsafe locking
mechanism).
Position monitoring of the safety guard and monitor-
ing of interlocking are performed via two separate
switching elements (see Figure 1).
SK ÜK
E1
E2
Figure 1: Function of safety switch TQ
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.
Monitoring contacts for the guard
locking position
All versions feature at least one contact for monitor-
ing guard locking. These contacts are opened when
guard locking is released.
Version TQ1
(guard locking actuated by spring force and released
by energy ON)
f
Activating guard locking: close safety guard; no
voltage at the solenoid
f
Releasing guard locking: apply voltage to the
solenoid
The spring-operated guard locking functions in
accordance with the closed-circuit current princi-
ple. If voltage is interrupted at the solenoid, guard
locking remains active and the safety guard cannot
be opened directly.
If the safety guard is open when the power supply
is interrupted and the guard is then closed, guard
locking is activated. This can lead to persons being
locked in unintentionally.
Version TQ2
(guard locking actuated by energy ON and released
by spring force)
f
Activating guard locking: apply voltage to the
solenoid
f
Releasing guard locking: disconnect voltage from
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 safety guard can be
opened directly!
Switching states
The detailed switching states for your switch can be
found in Figure 4. All available switching elements
are described there.
Safety guard open
TQ1 and TQ2:
The safety contacts are open.
Safety guard closed and not locked
TQ1 and TQ2:
The safety contacts are closed, the guard
locking monitoring contacts are open.
Safety guard closed and locked
TQ1 and TQ2:
The safety contacts are closed, the guard
locking monitoring contacts are closed.
Selection of the actuator
NOTICE
Damage to the device due to unsuitable actuator.
Make sure to select the correct actuator (see
table in Figure 5).
Additionally pay attention to the door radius and
the fastening options (see Figure 6).
Manual release
Some situations require guard locking to be released
manually (e.g. malfunctions or an emergency). 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 screwdriver
Important!
Only use in an emergency!
f
After release the screw must be tightened to 0.3
to max. 0.5 Nm.
In the event of malfunctions, the guard locking can
be released with the auxiliary release irrespective
of the state of the solenoid.
The guard locking monitoring contacts are opened
when the auxiliary release is actuated.
