EUCHNER STP-TWxxxAS1 - Handbuch (Seite 5)

Operating Instructions Safety Switches STP-TW...AS
1
Correct use
Safety switches series STP-TW...AS are operated as
a slave on the safety bus
AS-Interface Safety at Work
and function as electromagnetic interlock 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
guards are 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 60204-1, 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. Actuator
S standard, actuator
L with insertion funnel.
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
Safety switches series STP-TW...AS have two actuator
heads. They permit the simultaneous locking or
unlocking of two movable safety guards.
Safety switches series STP-TW...AS 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 STP-TW...AS sends over the AS-Inter-
face 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-Interface input bits D2 and
D3.
The safety switch must be correspondingly configured
in the AS-Interface safety monitor (refer to the
operating instructions of the AS-Interface safety
monitor used and the status table).
Actuator version
Actuator S for safety switches STP-TW... without
insertion funnel.
Actuator
L for safety switches STP-TW with insertion
funnel.
Version STP-TW3...AS
(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 STP-TW4...AS (solenoid interlock)
(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.
STP-TW3...AS: The guard locking pin is moved to
locked position by spring force.
STP-TW4...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
STP-TW3...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.
Solenoid monitoring contact ÜK is opened. The value
pair 0, 0 is sent during each bus cycle via AS-Inter-
face 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.
STP-TW4...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.
Solenoid monitoring contact ÜK is opened. The value
pair 0, 0 is sent during each bus cycle via AS-Inter-
face 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 4).
If the switch has a mechanical key release (optional),
the guard locking can be retained in the „not locked“
position (see Figure 1). Accidental locking in, for
example, of maintenance personnel is then prevented.
f Actuating mechanical release
1. Unscrew locking screw.
2. Using a screwdriver, turn the mechanical release
by around 180° in the direction of the arrow
3. Return the locking screw to its original position
and seal after use (for example with sealing
lacquer or using wire).
f Actuating mechanical key release
1. Insert key in the key opening
2. Rotate key from pos. 1 (normal operation) to pos.
2 (locked)
3. Remove key
4. Return to original position after use
Indication
The position of the guard locking is indicated in the
window.
Figure 1: Mechanical key release and display
Marking
Locked
Not locked
Pos. 2
(locked)
Pos. 1
(normal
operation)