EUCHNER CET-AX User Manual
Operating Instructions Read Head CET-AX with Guard Locking and Guard Locking Monitoring
Correct use
Series CET-AX read heads are operated in combination with an evaluation unit in the system family
CES-AZ. In this combination the read head CET-AX
is an electromagnetic interlock device with guard
locking and guard locking monitoring.
In combination with a safety guard and the machine
control, this safety system 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 situ-
ations 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 components are used, a risk assessment must be performed on the machine in
accordance with
f EN ISO 13849-1, Safety of machinery. Safety re-
lated parts of control systems. General principles
for design, Annex B
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 compliance with the relevant
requirements for installation and operation, in
particular
f EN ISO 13849-1, Safety of machinery. Safety re-
lated parts of control systems. General principles
for design
f EN 1088, Safety of machinery. Interlocking
devices associated with guards. Principles for
design and selection
f EN 60204-1, Safety of machinery. Electrical equip-
ment of machines. General requirements.
The read head 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 read head CET is only allowed to be used in
combination with a system family CES-AZ evaluation
unit (see Table 2).
Important:
f The user is responsible for the integration of
the device into a safe overall system. For this
purpose, the overall system must be validated,
e.g. according to EN ISO 13849-2.
f Correct use requires observing the permissible
operating parameters (see Technical data).
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.
f The PL that can be achieved depends on the
installation position and the evaluation unit used.
Pay attention to the information in Table 2.
Exclusion of liability and warranty
In case of failure to comply with the conditions for
correct use stated above, or if the safety instructions are not followed, or if any servicing is not
performed as required, liability will be excluded and
the warranty void.
Safety precautions
Safety components fulfill personal protection functions. Incorrect installation or tampering can lead to
fatal injuries to personnel.
Check the safe function of the safety guard particularly
f after any setup work
f after the replacement of a system component
f after an extended period without use
f after every fault
Independent of these checks, the safe function of the
safety guard should be checked at suitable intervals
as part of the maintenance schedule.
Fatal injury due to incorrect connection or incor-
rect use.
f Safety switches must not be bypassed (bridg-
ing 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.
The device may be installed and put into opera-
tion only by authorized experts
f who are familiar with the correct handling of
safety components
f who are familiar with the applicable EMC
regulations
f who are familiar with the applicable regula-
tions on health and safety and accident
prevention
f who have read and understood the operating
instructions and the system manual.
The switching operation must only be trig-
gered by actuators specifically provided for
this purpose (see Table 3) which are positively
connected to the safety guard.
Function
In the read head there is a lift tappet (1) that contains
the transponder (see Figure 1). The actuator has a
spring-mounted guard locking pin (2) in which there
is a CES actuator. The guard locking is active if the
lift tappet is retracted and the guard locking pin is
in the recess (3) on the read head.
Actuator Read head
Figure 1: Read head and actuator
f Version CET1, guard locking by spring force
The lift tappet is pressed into the locked position
by the force of the spring for the guard locking pin
in the actuator and unlocked electromagnetically by
the read head. The guard locking functions in accordance with the closed-circuit current principle. The
locked safety guard cannot be opened immediately
in the event of interruption of the power supply to
the solenoid.
The actuator's guard locking pin cannot be moved
out of the recess and the door is locked in the closed
position as long as the lift tappet is pressed down
by the guard locking pin.
When the operating voltage is present at the locking solenoid, the lift tappet is extended and lifts the
actuator's guard locking pin above the edge of the
recess. The safety door can then be opened.
f Version CET2, guard locking by solenoid force
The safety guard can be opened immediately in
the event of interruption of the solenoid power
supply! Usage only in special cases in accordance with strict evaluation of the accident risk
(see DIN EN 1088 (1995), Section 5.5)!
Example: If the risk of accidental locking inside
a safety guard during a power failure is higher
than the risk of ineffective guard locking.
The lift tappet is initially extended by spring force.
The spring force on the guard locking pin is not
sufficient to press down the lift tappet. Only when
the guard locking solenoid is also switched on does
the lift tappet retract. The guard locking is active.
The guard locking operates in accordance with the
open-circuit current principle.
The safety door can be opened as long as the lift tappet is held in the extended position by spring force.
Releases
Important:
f The releases are not safety functions.
f The machine manufacturer must select and use
a suitable release (escape release, emergency
unlocking, etc.) for a specific application. A risk
assessment appraisal is required for this purpose.
It may be necessary to take specifications from
a product standard into account.
f The releases must not be used to lock the switch
during maintenance work to prevent activation of
guard locking, for example.
f The correct function must be checked at regular
intervals.
f Loss of the release function due to mounting
errors or damage during mounting.
f Check the release function every time after
mounting.
f Loss of the release function due to tension on
the actuator. The door must not be under tension
during release.
f Observe the notes on the enclosed data sheets.
Mechanical release and mechanical key
release (can be retrofitted)
The mechanical release can be used to unlock guard
locking, irrespective of the state of the solenoid.
Using mechanical release
1. Unscrew locking screw
2. Using a screwdriver, turn the mechanical
release by around 180° in the direction of the
arrow
¨ The safety device can be opened
The mechanical release must be returned to its
original position and sealed after use (for example
with sealing lacquer).
Using mechanical key release
On devices with mechanical key release (can be
retrofitted), simply turn the key to unlock. For mounting, see the mechanical key release supplement.
Operating Instructions Read Head CET-AX with Guard Locking and Guard Locking Monitoring
Emergency unlocking (can be retrofitted)
Using emergency unlocking
Important:
The door must not be under tension when emergency unlocking is actuated.
f Turn emergency unlocking clockwise until it clicks
into place.
¨ The safety device can be opened
To reset, press the detent bolt inward using a small
screwdriver or similar tool and turn the emergency
unlocking back.
Escape release (optional)
The escape release is used to open a locked safety
guard from the inside (see dimension drawing in the
section Technical data).
Fit escape release such that operation, inspection
and maintenance are possible.
Using the escape release
f Press the red release knob to the stop
¨ The safety device can be opened
Pull the knob out again to reset.
Wire front release (optional)
The wire front release permits remote release of
the guard locking via a pull rope. Flexible routing of
the pull rope permits release of the guard locking
in inaccessible installation situations.
Lockout mechanism (optional)
Important:
f The lockout mechanism is not a safety function.
f The correct function must be checked at regular
intervals.
The lockout mechanism can be used to prevent
maintenance personnel from being unintentionally
locked in the danger area, for example.
In locked position, the lockout mechanism prevents
activation of guard locking. The lockout mechanism
can be secured in locking position with up to three
locks. The mechanical release can still be used.
Using the lockout mechanism
Important:
Deactivate guard locking and open the safety door
before using the lockout mechanism.
Before entering the danger area:
1. Open the door
2. Press button, move lockout mechanism to
locking position (Figure 1 A and B) and secure
with lock (Figure C)
¨ Guard locking cannot be activated, and it must
not be possible to start the machine. Important:
Test this before entering the danger area.
Resetting the lockout mechanism:
1. Open the safety door if necessary
2. Remove the lock
3. Move lockout mechanism to basic position
(Figure 1 A)
Mounting
Caution:
Safety switches must not be bypassed (bridging
of contacts), turned away, removed or otherwise
rendered ineffective.
f 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.
Caution:
Risk of damage to equipment as a result of incorrect
installation. Safety switches must not be used as a
mechanical end stop.
f Fit an additional end stop for the movable part of
the safety guard.
f Observe the min. door radii (see Figure 3).
f Ensure that the actuator contacts the slide in the
designated area (see figure below). Marks on
the slide specify the prescribed approach zone.
Note the following points:
f Actuator and safety switch must be easily acces-
sible for inspection and replacement.
f The switching operation must only be triggered by
the specific actuator designated for this purpose.
f Actuator and safety switch must be fitted so that
f the actuator is positively mounted on the safety
guard, e.g. by using the safety screws included.
f they cannot be removed or tampered with using
simple means.
f the active faces of the actuator and the safety
switch are parallel to each other (see Figure 3).
f the actuator is fully inserted into the switch recess
when the safety guard is closed (see Figure 3).
Changing the approach direction
Figure 2: Changing the approach direction
f Remove the screws from the read head.
f Set the required direction.
f Tighten the screws with a torque of 1.5 Nm.
Protection against environmental effects
A lasting and correct safety function requires that the
actuating head must be protected against foreign
bodies such as swarf, sand, blasting shot, etc.,
which can become lodged in the recess. For this
purpose, the read head should be installed with the
actuating head facing down.
!
Cover the actuating head, the actuator and the rating
plate during painting work!
Electrical connection
The read head CET is only allowed to be used in
combination with a suitable EUCHNER connection cable (see Table 1). The connection cable
contains two screened cores for the signal
from the read head. This screening must not be
interrupted on the route to the evaluation unit
or earthed at any other point (see Figure 8).
All the electrical connections must either be
isolated from the mains supply by a safety
transformer according to IEC EN 61558-2-6
with limited output voltage in the event of a
fault (PELV), or by other equivalent isolation
measures.
For use and operation as per the
a power supply with the feature "for use in class 2
circuits" must be used. The same requirement applies to the safety outputs.
requirements,
Subject to technical modifications, no responsibility is accepted for accuracy of this information. © EUCHNER GmbH + Co. KG 098069-16-11/12 (translation of the original operating instructions)
Locking function not active
Pushbutton Push button and
Locking function active
align lever
Locking function active
and secured
Fit lock
A B C
Figure 1: Function of lockout mechanism
EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. +49/711/75 97-0 Fax +49/711/75 33 16 www.euchner.de info@euchner.de
Operating Instructions Read Head CET-AX with Guard Locking and Guard Locking Monitoring
min R800
!
= 90°
Anfahrbereich/
Approach Zone
min R300
Figure 3: Door radii and approach zone
74,5 ± 4 mm
Alternative solutions must comply with the following
requirements:
f Electrically isolated power supply unit with a max.
open-circuit voltage of 30 V/DC and a limited
current of max. 8 A.
f Electrically isolated power supply unit in combina-
tion with fuse as per UL248. This fuse should be
designed for max. 3.3 A and should be integrated
into the 30 V DC voltage section.
In order to avoid EMC interference, the physical
environmental and operating conditions at the
installation site of the device must comply with
the requirements according to the standard
EN 60204-1:2006, section 4.4.2 (EMC).
f For terminal assignment see Figure 4.
f For detailed information see the system manual
for the evaluation unit used.
Setup and functional check
Pay attention to the information in the system manual
for the evaluation unit used during setup.
Danger of fatal injuries as a result of faults in
installation and functional check.
f Before carrying out the functional check,
make sure that there are no persons in the
danger area.
f Observe the valid accident prevention regula-
tions.
f Mechanical function test
The actuator must slide easily into the recess on
the actuating head. Close the safety guard several
times to check the function.
f Electrical function test
After installation and any fault, the safety function
must be fully checked. Proceed as follows:
1. Switch on operating voltage.
f The machine must not start automatically.
2. Close all safety guards.
Guard locking by solenoid force: Activate
guard locking.
f The machine must not start automatically. It
must not be possible to open the safety guard.
3. Enable operation in the control system.
f It must not be possible to deactivate the guard
locking as long as operation is enabled.
4. Disable operation in the control system and
deactivate guard locking.
f The guard locking must remain active until there
is no longer any risk of injury.
f It must not be possible to start the machine as
long as the guard locking is deactivated.
Service and inspection
Warning:
Loss of the safety function because of damage
to the system.
In case of damage, the entire device must be
replaced.
Only accessories or spare parts that can be ordered
from EUCHNER may be replaced.
Regular inspection of the following is necessary to
ensure trouble-free long-term operation:
f Check the switching function (see section Functional
check)
f Check all additional functions (e.g. escape release,
lockout mechanism, etc.)
f Check the secure fastening of the devices and the
connections
f Check for soiling
No servicing is required, repairs to the device are only
allowed to be made by the manufacturer.
Note:
The year of manufacture can be seen in the lower right
corner of the type plate.
Exclusion of liability under the following
circumstances
f incorrect use
f non-compliance with safety regulations
f installation and electrical connection not per-
formed by authorized personnel
f failure to perform functional checks.
Technical data
f Read head
Parameter Value
Material
- Slide
- Read head housing
Installation position
Degree of protection acc. to
IEC 60529
Mechanical life 1 x 10
Ambient temperature -20 ... +55 °C
Actuator approach speed,
max.
Locking force, max. 6,500 N
Locking force F
in acc. with GS-ET-19
Weight Approx. 1 kg
Degrees of freedom X, Y, Z X, Y ± 5 mm; Z ± 4 mm
Switching frequency 1 Hz (this value can deviate
Connection See Figure 4
Rated insulation
voltage U
Rated impulse withstand
voltage U
Solenoid
Connection Reverse polarity protected
Solenoid operating voltage/
Solenoid power consumption
Duty cycle 100 %
Zh
i
imp
f Actuator
Parameter Value
Housing material Stainless steel
Installation position
Degree of protection acc. to
IEC/EN 60529
Mechanical life 1 x 10
Ambient temperature -20 ... +55 °C
Locking force, max. 6,500 N
Weight Approx. 0.25 kg
Stroke max. 15 mm
Door radius, min. 300 mm
Power supply Inductive, via read head
f LED
Parameter Value
Connection voltage 24 V ± 15 % (reverse polarity
Current consumption, max.
Stainless steel
Die-cast aluminum
Any (recommendation: actuating head downward)
IP67 (screwed tight with the
related mating connector)
6
operating cycles
20 m/min
F
max
=
= 5,000
F
Zh
1.3
depending on the evaluation unit used. See system
documentation of the related
evaluation unit)
50 V
1.5 kV
DC 24 V +10% -15% 10 W
Active face opposite read head
IP67
6
operating cycles
protected)
6 mA
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