EUCHNER NZ.H/PxxxAS1 - Handbuch (Seite 4)

Operating Instructions Safety Switches NZ.H/P...AS
1
Correct use
EUCHNER safety switches series NZ...AS1 are
operated as a slave on the safety bus
AS-Interface
Safety at Work and function as interlocking devices
without guard locking.
In combination with a separating safety guard, this
safety device prevents dangerous machine
movements from occurring while the safety guard
is open. A stop command is triggered if the safety
guard is opened during the dangerous machine
function.
For the control system, this means that
f starting commands which cause hazardous
situations must become active only when the
safety guard is in the protective position.
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 the 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
from EN 1088:1995+A2:2008, section 5.7.
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-Inter-
face safety monitor used must be observed.
Mounting, electrical connection and setup only
by authorized personnel.
Function
EUCHNER safety switches series NZ...AS1 permit
the safe monitoring of movable safety guards.
The position monitoring of the safety guard is
carried out with two positively driven contacts.
When the safety guard is closed, each NZ...AS1
transmits a switch-specific, unique safety code
sequence with 8x4 bits via the AS-Interface bus.
This code sequence is evaluated by an AS-Inter-
face safety monitor. The first positively driven NC
contact is represented by the AS-Interface input
bits D0 and D1, while the second positively driven
NC contact is represented by D2 and D3.
The switch-specific safety code sequence is
transmitted via the AS-Interface input bits D0 to
D3 when the safety guard is closed.
When the safety guard is open, the values 0, 0, 0,
0 are transmitted in every bus cycle by D0 to 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).
Changing the actuating direction
f Vertical actuator adjustment 4 x 90°
(positive mounting)
Fig. 1: Changeover of approach direction, vertical
f Horizontal adjustment 4 x 90°
Fig. 2: Changeover of approach direction, horizontal
f Switching direction change with lever arm
actuation
Fig. 3: Changing the switching direction
Mounting
The safety switches must not be used as a
mechanical end stop.
Safety switches and trip dogs must be arranged
such that they are adequately secured against
movement.
To meet these requirements:
f The fixings must be reliable and must also require
the use of a tool to undo them.
f The use of slots must be limited to the initial
adjustment.
f Precautions must be taken to ensure that there
is no movement after adjustment (e.g. using bolts
or dowel pins).
The actuator (lever arm) must be positively mounted
to the actuating shaft. The square drives on the
actuator and actuating shaft must engage with each
other (see Figure 1).
To ensure correct operation, the trip dogs must be
fitted so that the actuator is deflected by at least
an angle of (achievement of the stipulated contact
opening, see Figures 6 and 7).
Safety switches must be attached and, if necessary,
protected in such a way that predictable damage
can be avoided.
It must be ensured that safety switches are
accessible for maintenance and function tests.
Assemble the safety switch so that
f access to the switch is difficult for operating
personnel when the safety guard is open
f address programming, inspection and replace-
ment by authorized personnel is possible.
Electrical connection
The safety switch is connected to the bus system
with a 2- or 4-pole connecting cable with M12 plug
connector via a passive AS-Interface distribution
box with a yellow AS-Interface cable.
Fig. 4: AS-Interface M12 plug connector terminal
assignment
Setup
f Setting the AS-Interface address
The address can be set prior to or after assembly.
The AS-Interface address of the safety switch is
set using an AS-Interface programming device.
Addresses 1 to 31 are valid.
The unit is programmed by connecting the
programming device to the M12 plug connector
on the safety switch with an AS-Inter face
programming device.
Address 0 is the default setting on delivery (the
AS-Interface LED
Fault! is lit during operation).
f Configuration in the AS-Interface safety monitor
(see operating instructions for the AS-Interface
safety monitor and status table)
The safety switch is configured in the AS-Interface
safety monitor with the AS-Interface address set
as follows, for example:
f Two-channel dependent
f Synchronization time: typ. 3 s
Left / right switching Right switching Left switching
(standard position)
1 AS-Interface +
2 Not used
3 AS-Interface -
4 Not used
View of safety switch
plug connector
4 3
1 2