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Safety Information and Maintenance
(Part of the Operating Instructions for Safety Switch CET-AR/CET-AP)
Scope
This safety information is part of the operating
instructions for safety switch CET-AR/CET-AP
Correct use
The safety switch CET is an electromagnetic inter-
lock device with guard locking.
The following applies to CET-AR: The safety switch
CET-AR can be integrated into a switch chain for the
safety system CES-AR or operated as a separate
system.
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
starting commands which cause hazardous situ-
f
ations must become active only when the safety
guard is in protective position and the guard lock-
ing 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 components are used, a risk as-
sessment must be performed on the machine in
accordance with
EN ISO 13849-1, Safety of machinery. Safety re-
f
lated parts of control systems. General principles
for design, Annex B
EN ISO 12100, Safety of machinery - General
f
principles for design - Risk assessment and risk
reduction
IEC 62061, Safety of machinery. Functional safety
f
of safety-related electrical, electronic and program-
mable electronic control systems.
Correct use includes compliance with the relevant
requirements for installation and operation, in
particular
EN ISO 13849-1, Safety of machinery. Safety re-
f
lated parts of control systems. General principles
for design
EN 1088, Safety of machinery. Interlocking
f
devices associated with guards. Principles for
design and selection
EN 60204-1, Safety of Machinery. Electrical equip-
f
ment of machines. General requirements.
The safety switch is only allowed to be operated
in conjunction with the intended EUCHNER CET
actuators and the related connection components
from EUCHNER. On the use of different actuators or
other connection components, EUCHNER provides
no warranty for safe function.
The following applies to CET-AR: Connection of
several devices in an AR switch chain is permitted
only using devices intended for series connection
with the CES-AR. Check the operating instructions
for the related device.
A maximum of 20 safety switches are allowed to be
operated in a switch chain.
Important:
The user is responsible for the integra-
tion 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.
Correct use requires observing the permissible
operating parameters (see Technical data).
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.
In the estimation of the PL for the overall system, a
maximum value of 100 years can be assumed for
the MTTF
according to the limit value in EN ISO
d
13849-1:2008, Section 4.5.2. This corresponds
to a minimum value for the PFH
of 2.47 x 10
d
The following applies to CET-AR: When up to 11
devices are connected in series, these limit values
can be assumed for the entire switch chain as
a subsystem. As a subsystem, this switch chain
achieves PL e. If more than 11 devices are con-
nected in series, the PFHd can be calculated using
one of the methods stated in EN ISO 13849-1:2008,
Section 4.5.1.
If the simplified method according to Section 6.3
of EN ISO 13849:2008-12 is used for validation,
the Performance Level (PL) might be reduced when
more than 11 devices are connected in series.
Exclusion of liability and warranty
In case of failure to comply with the conditions for
correct use stated above, or if the safety instruc-
tions are not followed, or if any servicing is not
performed as required, liability will be excluded and
the warranty void.
General safety instructions
Safety switches fulfill personal protection functions.
Incorrect installation or tampering can lead to fatal
injuries to personnel.
Check the safe function of the safety guard par-
ticularly
after any setup work
f
after the replacement of a CET component
f
after an extended period without use
f
after every fault
f
Independent of these checks, the safe function
of the safety guard should be checked at suitable
intervals as part of the maintenance schedule.
Warning: Danger of fatal injury in the event of
incorrect connection or incorrect use.
Safety switches 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 possi-
bility of bypassing from EN 1088:1995+A2:2008,
Section 5.7.
The device is only allowed to be installed and placed
in operation by authorized personnel
who are familiar with the correct handling of safety
f
components
who are familiar with the applicable EMC regula-
f
tions
who are familiar with the applicable regulations on
f
health and safety and accident prevention
who have read and understood the operating
f
instructions.
Prior to use, read the operating instructions on the
CD/DVD supplied, and keep these in a safe place.
Ensure the operating instructions are always avail-
able during mounting, setup and servicing.
EUCHNER cannot provide any warranty in relation to
the readability of the CD/DVD for the storage period
required. For this reason you should archive a printed
copy of the operating instructions. You can download
the operating instructions at www.EUCHNER.de.
/h.
-8
Operating instructions on CD/DVD
Each device is supplied with operating instructions
on CD/DVD; these instructions contain detailed
information on the overall system. The following
system requirements must be met to be able to
open or print the document:
PC with PDF Reader installed
f
CD/DVD drive
f
Opening and printing the documents
f
Important: the autoplay function for the drive must be
enabled (see operating system help) and you will need
a PDF Reader that can open PDF files from version 4.
1. Insert CD/DVD
Selection table is opened in the browser
¨
2. Click the related document for your system
The document is opened and can be printed
¨
Mounting, setup and troubleshooting
The safety switch must not be opened.
The safety switch must be mounted with the
slide facing down or horizontal in order to
achieve safety category 4 in accordance with
EN 13849-1 for the safety guard position
monitoring.
Assemble the safety switch so that
access to it is difficult for operating personnel
f
when the safety guard is open
it is possible to operate the mechanical release
f
and check and replace the safety switch.
Safety switches and actuators must not be used
as an end stop.
Mount the safety switch only in assembled
condition
For detailed instructions on mounting, setup and
troubleshooting, please refer to the operating
instructions on the CD/DVD.
Electrical connection
For detailed information on the electrical connec-
tion, please refer to the operating instructions on
the CD/DVD.
Important: To achieve the stated category accord-
ing to EN ISO 13849, both safety outputs must
always be evaluated.
Do not use a control system with pulsing or switch
off the pulsing function in your control system.
Take note of the connection example in the operating
instructions on CD/DVD.
All the electrical connections must either be isolated
from the mains supply by a safety transformer
according to IEC 61558-2-6 with limited output
voltage in the event of a fault, or by other equivalent
isolation measures.
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