EUCHNER TXxxxAS1 - Handbuch (Seite 5)

Operating Instructions Safety Switches TX...AS
1
Correct use
EUCHNER safety switches series TX...AS1 are
operated as a slave on the safety bus
AS-Interface
Safety at Work and function as electromagnetic inter-
lock devices with guard locking.
In combination with a safety guard and the machine
control, this safety component prevents the safety
guard from being opened while a dangerous machine
movement is being performed.
For the control system, this means that
f starting commands which cause hazardous
situations must become active only when the safety
guard is in protective position and the guard locking
is in locked position.
The locked position of the guard locking must be
released only when the hazardous situation is no
longer present.
Before safety switches are used, a risk assessment
must be performed on the machine, e.g., in
accordance with
f EN ISO 13849, Safety of machinery - Safety-related
parts of control systems
f EN 12100-1, 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 compliance with the relevant
requirements for installation and operation, particularly
f EN ISO 13849, Safety of machinery - Safety-related
parts of control systems
f EN 1088, Safety of machinery. Interlocking devices
associated with guards. Principles for design and
selection
f EN 60 204-1, Electrical equipment of machines.
Important:
f The user is responsible for safe integration of the
device in 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
EN ISO 13849-1:2008 is used for validation, the
Performance Level (PL) may be reduced if several
devices are connected one after the other.
f If a product data sheet is included with the product,
the information on the data sheet applies in case of
discrepancies with the operating instructions.
Safety precautions
Safety switches fulfill a personal protection function.
Incorrect installation or tampering can lead to severe
injuries to personnel.
Safety components must not be bypassed
(bridging of contacts), turned away, removed or
otherwise rendered ineffective.
On this topic pay attention in particular to the
measures for reducing the possibility of bypassing
according to EN 1088:1995.A2:2008, sec. 5.7.
The switching operation may only be triggered
by actuators specially provided for this purpose
which are permanently connected to the
protective guard.
A complete safety-oriented system generally
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 instructions and requirements stated
in the Operating Instructions of the AS-Interface
safety monitor used must be observed.
Mounting, electrical connection and setup only
by authorized personnel.
Function
EUCHNER safety switches series TX...AS1 feature a
slave connection to the safety bus
AS-Interface Safety
at Work. They permit locking of movable safety
guards.
Position monitoring of the safety guard and monitoring
of interlocking are performed via two separate
switching elements (door monitoring contact SK and
solenoid monitoring contact ÜK).
When the safety guard is closed and the guard locking
is active, each TX...AS1 sends over the AS-Interface
bus a switch-specific, unique safety code sequence
with 8x4 bits. This code sequence is evaluated by an
AS-Interface safety monitor. The positively driven
contact SK for door monitoring is represented by the
AS-Interface input bits D0 and D1. The solenoid
monitoring contact ÜK is represented by the AS-In-
terface input bits D2 and D3.
The safety switch must be correspondingly configured
in the AS-Interface safe-ty monitor (refer to the
operating instructions of the AS-Interface safety
monitor and the status table).
Version TX1...AS1
(guard locking by spring force)
For the purpose of the protection of people
against dangerous over-traveling movements, it
is also necessary to switch the black AS-Inter-
face cable (auxiliary power), which is connected
to the AS-Interface distribution box and the
switch, via a standstill monitor or via the safe
switch-on delay feature in a dual-channel AS-In-
terface safety monitor (e.g. door locking for
duration of the delay time).
The guard locking pin is held in the locked position by
spring force and unlocked by electromagnetic
actuation. The spring interlock guard locking functions
in accordance with the closed-circuit current principle.
The safety guard cannot be opened immediately in
the event of interruption of the solenoid power supply.
For the purpose of process protection, the guard
locking solenoid can be switched via the software by
means of AS-Interface output bit D0.
Version TX2...AS1
(guard locking by solenoid force)
This type must be used only in special cases
after strict assessment of the accident risk!
The safety guard can be opened immediately in
the event of interruption of the solenoid power
supply!
The guard locking pin is held in the locked position by
electromagnetic force and released by spring force.
The guard locking operates in accordance with the
open-circuit current principle.
For the purpose of process protection, the guard
locking solenoid can be switched via the software by
means of AS-Interface output bit D0.
f Closing safety guard and activating guard locking
The guard locking pin is released by insertion of the
actuator into the safety switch.
TX1...AS: The guard locking pin is moved to locked
position by spring force.
TX2...AS: The guard locking pin is moved to locked
position when the solenoid operating voltage is
applied.
The safety contacts are closed.
The complete safety code sequence (8 x 4 bits) is
sent via AS-Interface input bits D0 to D3.
f Deactivating guard locking, opening safety guard
TX1...AS: The guard locking is deactivated when the
solenoid operating voltage is applied, and release is
issued by means of AS-Interface output bit D0. Sole-
noid monitoring contact ÜK is opened. The value pair
0, 0 is sent during each bus cycle via AS-Interface
input bits D2 and D3.
The actuator can be removed.
Door monitoring contact SK is positively opened and
guard locking is blocked in this position when the
actuator is removed (protection against unintentional
closing). The values 0, 0, 0, 0 are continuously sent
via AS-Interface input bits D0 to D3.
TX2...AS: The guard locking is deactivated when the
solenoid operating voltage is applied, and release is
issued by means of AS-Interface output bit D0. Sole-
noid monitoring contact ÜK is opened. The value pair
0, 0 is sent during each bus cycle via AS-Interface
input bits D2 and D3.
The actuator can be removed.
Door monitoring contact SK is positively opened and
guard locking is blocked in this position when the
actuator is removed (protection against unintentional
closing). The values 0, 0, 0, 0 are continuously sent
via AS-Interface input bits D0 to D3.
Mechanical release
In the event of malfunctions, the guard locking can
be released with the mechanical release irrespective
of the state of the solenoid (see Figure 3).
f Unscrew locking screw.
f Using a screwdriver, turn the mechanical release
by approx. 180° in the direction of the arrow.
The locking screw must be returned to its original
position and sealed after use (for example with sealing
lacquer).
Mounting
Safety switches and actuators must not be used
as an end stop.
Mount the safety switch only in assembled
condition!
Assemble the safety switch so that
f access to the switch is difficult for operating
personnel when the safety guard is open
f operation of the mechanical release is still possible
f address programming, inspection and replacement
by authorized personnel is possible.
f Insert the actuator in the actuating head.
f Mount the safety switch positively.
f Permanently connect the actuator to the safety
guard so that it cannot be detached, e.g. using the
enclosed non-removable screws, rivets or welding.
f Fit an additional stop for the movable part of the
safety guard.
Changing the actuating direction
Figure 1: Changing the actuating direction
f Unscrew and open switch cover.
f Remove actuating head from the switch by turning
and refit in the required position (bayonet fastening).
f Fit locking pins supplied for protection against
twisting.
f Close the cover and screw in position.
f Cover the unused actuating slot with the enclosed
slot covers.
Protection against environmental influences
A lasting and correct safety function requires that the
actuating head must be protected against the
penetration of foreign bodies such as swarf, sand,
blasting shot, etc.
A