EUCHNER CET.-AR Series User manual

EN
Operating Instructions
Transponder-Coded Safety Switch With Guard Locking
CET.-AR-… (Unicode/Multicode)

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
2(Translation of the original operating instructions) 2110788-13-03/20
Contents
1. About this document............................................................................................. 4
1.1. Scope............................................................................................................................................4
1.2. Target group ..................................................................................................................................4
1.3. Key to symbols...............................................................................................................................4
1.4. Supplementary documents ..............................................................................................................4
2. Correct use .......................................................................................................... 5
3. Description of the safety function .......................................................................... 6
4. Exclusion of liability and warranty ......................................................................... 7
5. General safety precautions ................................................................................... 8
6. Function............................................................................................................... 9
6.1. Guard lock monitoring.....................................................................................................................9
6.2. Monitoring output (OUT) ..................................................................................................................9
6.3. Door monitoring output (OUTD).....................................................................................................10
6.4. Diagnostic output (DIA)..................................................................................................................10
6.5. Guard locking for versions CET1 and CET3.....................................................................................10
6.6. Guard locking for versions CET2 and CET4.....................................................................................10
6.7. Start button and feedback loop (optional) .......................................................................................10
6.8. Switching states ...........................................................................................................................11
7. Manual release................................................................................................... 12
7.1. Auxiliary release and auxiliary key release (can be retrotted) ...........................................................12
7.1.1. Actuating auxiliary release .............................................................................................12
7.1.2. Actuating auxiliary key release .......................................................................................12
7.2. Emergency release (can be retrotted) ...........................................................................................13
7.2.1. Actuating emergency release.........................................................................................13
7.3. Escape release (optional) ..............................................................................................................14
7.3.1. Actuating escape release...............................................................................................14
7.4. Wire front release (optional) ...........................................................................................................15
7.4.1. Laying wire front release................................................................................................15
8. Changing the approach direction ........................................................................ 15
9. Mounting............................................................................................................ 16
10. Electrical connection .......................................................................................... 18
10.1. Notes about .........................................................................................................................19
10.2. Safety in case of faults..................................................................................................................19
10.3. Fuse protection for power supply...................................................................................................19
10.4. Requirements for connecting cables...............................................................................................20
10.5. Maximum cable lengths.................................................................................................................21
10.5.1. Determining cable lengths using the example table..........................................................22

3
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
10.6. Connector assignment for safety switch CET-AR with plug connectors 2 x M12 .................................23
10.6.1. Version without door monitoring output (CET1/2) ............................................................23
10.6.2. Version with door monitoring output (CET3/4) .................................................................23
10.6.3. Version with door monitoring output (CET3/4) and additional monitoring output OUT on X2.3.
24
10.7. Connector assignment for safety switch CET-AR with plug connector M23 (RC18)..............................24
10.7.1. Version without door monitoring output (CET1/2) ............................................................24
10.7.2. Version with door monitoring output (CET3/4) .................................................................25
10.8. Connector assignment of Y-distributor............................................................................................26
10.9. Connection of a single CET-AR .......................................................................................................27
10.10. Connection of several CET-AR in a switch chain ...............................................................................33
10.11. Information on operation on an AR evaluation unit............................................................................35
10.12. Notes on operation with safe control systems.................................................................................35
10.12.1. Particularities for version with plug connectors 2xM12, wiring diagrams A and B, and plug
connector M23 (RC18), wiring diagrams D and E.............................................................35
11. Setup ................................................................................................................. 37
11.1. LED displays ................................................................................................................................37
11.2. Teach-in function for actuator (only for unicode evaluation) ...............................................................37
11.2.1. Preparing device for the teach-in operation and teaching-in actuator..................................38
11.2.2. Teach-in function with series connection, replacing and teaching in device .........................39
11.3. Functional check...........................................................................................................................40
11.3.1. Mechanical function test ................................................................................................40
11.3.2. Electrical function test...................................................................................................40
12. System status table ............................................................................................ 41
13. Technical data .................................................................................................... 42
13.1. Technical data for safety switch CET.-AR-….....................................................................................42
13.1.1. Typical system times.....................................................................................................43
13.2. Dimension drawing for safety switch CET.-AR-… ..............................................................................44
13.3. Technical data for actuator CET-A-B… ............................................................................................46
13.3.1. Dimension drawing for actuator CET-A-BWK-50X..............................................................46
14. Ordering information and accessories................................................................. 47
15. Inspection and service ........................................................................................ 47
16. Service .............................................................................................................. 47
17. Declaration of conformity ................................................................................... 48

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
4(Translation of the original operating instructions) 2110788-13-03/20
1. About this document
1.1. Scope
These operating instructions are valid for all CET-AR versions in accordance with the following table. These operating instruc-
tions, the document Safety information and any enclosed data sheet form the complete user information for your device.
Version System family Version number
CET1/2 …-AR… From V 1.5.0
CET3/4 From V 1.5.2
1.2. Target group
Design engineers and installation planners for safety devices on machines, as well as setup and servicing staff possessing
special expertise in handling safety components.
1.3. Key to symbols
Symbol/depiction Meaning
Printed document
Internet
www Document is available for download at www.euchner.com
DANGER
WARNING
CAUTION
Safety precautions
Danger of death or severe injuries
Warning about possible injuries
Caution slight injuries possible
NOTICE
Important!
Notice about possible device damage
Important information
Tip Useful information
1.4. Supplementary documents
The overall documentation for this device consists of the following documents:
Document title
(document number) Contents
Safety information
(2525460) Basic safety information
Operating instructions
(2110788) (this document)
Internet
www
Possibly enclosed data
sheet Item-specic information about deviations or additions
Important!
Always read all documents to gain a complete overview of safe installation, setup and use of the
device. The documents can be downloaded from www.euchner.com. For this purpose enter the doc.
no. in the search box.

5
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
2. Correct use
Safety switches series CET-AR are interlocking devices with guard locking (type 4). The device complies with the require-
ments according to ENIEC60947-5-3. Devices with unicode evaluation possess a high coding level, devices with multicode
evaluation possess a low coding level.
In combination with a movable guard and the machine control, this safety component prevents the guard from being opened
while a dangerous machine function is being performed.
This means:
ÌStarting commands that cause a dangerous machine function must become active only when the guard is closed and
locked.
ÌThe guard locking must not be released until the dangerous machine function has ended.
ÌClosing and locking a guard must not cause automatic starting of a dangerous machine function. A separate start com-
mand must be issued. For exceptions, refer to ENISO12100 or relevant C-standards.
Devices from this series are also suitable for process protection.
Before the device is used, a risk assessment must be performed on the machine, e.g. in accordance with the following
standards:
ÌENISO13849-1
ÌENISO12100
ÌIEC62061
Correct use includes observing the relevant requirements for installation and operation, particularly based on the following
standards:
ÌENISO13849-1
ÌENISO14119
ÌEN60204-1
The safety switch is allowed to be operated only in conjunction with the intended EUCHNER actuator and the related connec-
tion components from EUCHNER. On the use of different actuators or other connection components, EUCHNER provides
no warranty for safe function.
Connection of several devices in an AR switch chain is permitted only using devices intended for series connection in an AR
switch chain. Check this in the instructions of the device in question.
A maximum of 20 safety switches are allowed to be operated in a switch chain.
Important!
ÌThe user is responsible for the proper integration 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.
ÌIt is only allowed to use components that are permissible in accordance with the table below.
Table 1: Possible combinations for CET components
Safety switch
Actuator
CET-A-B…
CET.-AR-… (Unicode/Multicode)
Key to symbols Combination possible

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
6(Translation of the original operating instructions) 2110788-13-03/20
NOTICE
For information about combination with an AR evaluation unit, please refer to chapter 10.11. Information
on operation on an AR evaluation unit on page 35.
3. Description of the safety function
Devices from this series feature the following safety functions:
Monitoring of guard locking and the position of the guard
(interlocking device with guard locking according to ENISO14119)
ÌSafety function (see chapter 6.8. Switching states on page 11):
- The safety outputs are switched off when guard locking is released (monitoring of the locking element).
- The safety outputs are switched off when the guard is open (monitoring of the door position).
- Guard locking can be activated only when the actuator is located in the switch head (prevention of inadvertent locking
position (faulty closure protection)).
- The following additionally applies in an AR series connection: the safety outputs are switched on only when the device
receives a corresponding signal from its predecessor in the chain.
ÌSafety characteristics: category, Performance Level, PFHD(see chapter 13. Technical data on page 42).
NOTICE
You can regard the complete AR device chain as one subsystem during calculation. The following
calculation method applies to the PFHd value:
#1
PFHD,1 PFHD,ext
AR-Device #1 ... n External Evaluation
(e.g. PLC)
PFHDges =∑ PFHD,k + PFHd,ext
n
k=1
#2
PFHD,2
#n
PFHD,n
Alternatively, the simplied method according to section 6.3 of EN 13849-1:2015 can be used for
calculation.

7
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
Control of guard locking
If the device is used as guard locking for personnel protection, the control of the guard locking must be regarded as a
safety function.
The device does not feature a safety characteristic for the control of the guard locking, because the guard locking solenoid
is completely disconnected from outside the device (no control function within the device). It therefore does not contribute
to the failure probability.
The safety level for the control of guard locking is determined exclusively by the external control (e.g. PFHDext. for the
standstill monitor).
Guardlocking Device
PFHDext.
(e.g. standstill
monitor)
(locking mean)
NOTICE
For more information about safe control of guard locking, see chapter 10.12. Notes on operation with
safe control systems on page 35
4. Exclusion of liability and warranty
In case of failure to comply with the conditions for correct use stated above, or if the safety regulations are not followed,
or if any servicing is not performed as required, liability will be excluded and the warranty void.

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
8(Translation of the original operating instructions) 2110788-13-03/20
5. General safety precautions
Safety switches fulll personnel protection functions. Incorrect installation or tampering can lead to fatal injuries to personnel.
Check the safe function of the safeguard particularly
Ìafter any setup work
Ìafter the replacement of a CET component
Ìafter an extended period without use
Ìafter every fault
Independent of these checks, the safe function of the safeguard should be checked at suitable intervals as part of the
maintenance schedule.
WARNING
Danger to life due to improper installation or due to bypassing (tampering). Safety components perform
a personnel protection function.
ÌSafety components must not be bypassed, turned away, removed or otherwise rendered ineffec-
tive. On this topic pay attention in particular to the measures for reducing the possibility of bypass-
ing according to ENISO14119:2013, section 7.
ÌThe switching operation must be triggered only by actuators designated for this purpose.
ÌPrevent bypassing by means of replacement actuators (only for multicode evaluation). For this
purpose, restrict access to actuators and to keys for releases, for example.
ÌMounting, electrical connection and setup only by authorized personnel possessing the following
knowledge:
- specialist knowledge in handling safety components
- knowledge about the applicable EMC regulations
- knowledge about the applicable regulations on operational safety and accident prevention.
Important!
Prior to use, read the operating instructions and keep these in a safe place. Ensure the operating
instructions are always available during mounting, setup and servicing. For this reason you should
archive a printed copy of the operating instructions. You can download the operating instructions from
www.euchner.com.

9
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
6. Function
The device permits the locking of movable guards.
The system consists of the following components: coded actuator (transponder)
and switch.
Whether the device learns the complete actuator code (unicode) or not (multicode)
depends on the respective version.
ÌDevices with unicode evaluation: The actuator must be assigned to the
safety switch by a teach-in operation so that it is detected by the system. This
unambiguous assignment ensures a particularly high level of protection against
tampering. The system thus possesses a high coding level.
ÌDevices with multicode evaluation: Unlike systems with unique code detec-
tion, on multicode devices a specic code is not requested but instead it is only
checked whether the actuator is of a type that can be detected by the system
(multicode detection). There is no exact comparison of the actuator code with
the taught-in code in the safety switch (unique code detection). The system pos-
sesses a low coding level.
When the guard is closed, the actuator is moved towards the safety switch. When
the operating distance is reached, power is supplied to the actuator by the switch
and data are transferred.
The safety outputs are switched on when the locking pin is in the recess (state:
door closed and locked) and a permissible code is detected.
When guard locking is released, the safety outputs and the monitoring output
(OUT) are switched off.
Important!
ÌCET3 (closed-circuit current principle)
The activation of the guard locking solenoid results in the shutdown of
the safety outputs OA/OB and the monitoring output OUT.
ÌCET4 (open-circuit current principle)
The interruption (>5ms) of the power supply to UCM results in the shut-
down of the safety outputs OA/OB and the monitoring output OUT.
ÌIn both cases, the outputs are shut down independent of the actual po-
sition of the solenoid.
ÌFor more detailed information, see also chapter 10.12. Notes on opera‑
tion with safe control systems on page 35.
In the event of a fault in the safety switch, the safety outputs are switched off and the DIA LED illuminates red. The oc-
currence of faults is detected at the latest on the next demand to switch on the safety outputs (e.g. on starting).
6.1. Guard lock monitoring
All versions feature two safe outputs for monitoring guard locking (OA and OB). The safety outputs are switched off when
guard locking is released.
6.2. Monitoring output (OUT)
The monitoring output is switched on as soon as guard locking is active (state: door closed and locked) and the transponder
has been recognized.
Ramp/switch head
Plunger
Ramp
Transponder
Spring-
mounted
guard
locking pin
Recess

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
10 (Translation of the original operating instructions) 2110788-13-03/20
6.3. Door monitoring output (OUTD)
Versions CET3 and CET4 feature a door monitoring output (OUT D). The door monitoring output is switched on as soon as
the actuator is above the extended plunger (state: guard closed and not locked). The door monitoring output also remains
switched on when guard locking is active.
6.4. Diagnostic output (DIA)
Some versions have a diagnostic output. The diagnostic output is switched on in the event of a fault (switch-on condition as
for DIA LED, see chapter 12. System status table on page 41).
6.5. Guard locking for versions CET1 and CET3
(guard locking actuated by spring force and released by power-ON)
Activating guard locking: close guard; no voltage at the solenoid.
Releasing guard locking: apply voltage to the solenoid.
The spring-operated guard locking functions in accordance with the closed-circuit current principle. If the voltage is interrupted
at the solenoid, the guard locking remains active and the guard cannot be opened directly.
Important!
If the guard is open when the power supply is interrupted and is then closed, guard locking is activated.
This can lead to persons being locked in unintentionally.
The actuator’s guard locking pin cannot be moved out of the recess and the guard is locked as long as the plunger is
pressed down by the actuator.
When voltage is present at the guard locking solenoid, the plunger is extended and lifts the actuator’s guard locking pin
above the edge of the recess. The guard can be opened.
6.6. Guard locking for versions CET2 and CET4
(guard locking actuated by power-ON and released by spring force)
Important!
Use as guard locking for personnel protection is possible only in special cases, after strict assessment
of the accident risk (see ENISO14119:2013, section 5.7.1)!
Activating guard locking: apply voltage to the solenoid.
Releasing guard locking: disconnect voltage from the solenoid.
The magnetically actuated guard locking operates in accordance with the open-circuit current principle. If the voltage is
interrupted at the solenoid, the guard locking is released and the guard can be opened directly!
The guard can be opened as long as the plunger is held in the extended position.
The plunger is released when voltage is present at the guard locking solenoid. The actuator’s guard locking pin can now
press the plunger down. The guard is locked as soon as the guard locking pin is fully inserted into the recess.
6.7. Start button and feedback loop (optional)
A start button and a feedback loop can be connected (for monitoring downstream relays and contactors) (input Y).
Important!
Faults on the start button or in the feedback loop are not detected. This can lead to unintentional
automatic starting.
On devices with start button and feedback loop, safety outputs are switched on only when the start button is pressed
and the feedback loop is closed. Start button and feedback loop must be closed for at least500 ms.
The monitoring output OUT is switched on as soon as guard locking is active. The status of the feedback loop or the start
button has no inuence on this (see also chapter 12. System status table on page 41).

11
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
6.8. Switching states
The detailed switching states for your switch can be found in the system status table. All safety outputs, monitoring outputs
and LED displays are described there.
Guard closed and locked Guard closed and not locked Guard open
Voltage at guard locking solenoid
CET1/3
off on (irrelevant)
Voltage at guard locking solenoid
CET2/4
on off (irrelevant)
Safety outputs OA and OB on off off
Monitoring output OUT on off off
Door monitoring output OUT D
(only CET3 and CET4)
on on off

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
12 (Translation of the original operating instructions) 2110788-13-03/20
7. Manual release
Some situations require the guard locking to be released manually (e.g. malfunctions or an emergency). A function test
should be performed after release.
More information on this topic can be found in the standard ENISO14119:2013, section 5.7.5.1. The device can feature
the following release functions:
7.1. Auxiliary release and auxiliary key release (can be retrotted)
In the event of malfunctions, the guard locking can be released with the auxiliary release or the auxiliary key release irre-
spective of the state of the solenoid.
The safety outputs are switched off when the auxiliary release or auxiliary key release is actuated. Use the safety outputs
to generate a stop command.
The monitoring output OUT is switched off; OUTD can assume an undened state. Open the guard and close it again after
resetting the auxiliary release or auxiliary key release. The device will then operate normally again.
Important!
ÌThe actuator must not be under tensile stress during manual release.
ÌAfter use, reset the auxiliary release and screw in and seal the locking
screw (e.g. with sealing lacquer).
ÌThe auxiliary key release must not be used to lock the switch during
servicing to prevent activation of guard locking, for example.
ÌLoss of the release function due to mounting errors or damage during
mounting.
ÌCheck the release function every time after mounting.
ÌPlease observe the notes on any enclosed data sheets.
7.1.1. Actuating auxiliary release
1. Unscrew locking screw.
2. Using a screwdriver, turn the auxiliary release to in the direction of the arrow.
¨Guard locking is released.
7.1.2. Actuating auxiliary key release
On devices with auxiliary key release (can be retrotted), simply turn the key to release.
Function as for auxiliary release. For mounting, see the auxiliary key release supplement.
Locking screw
Auxiliary release

13
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
7.2. Emergency release (can be retrotted)
Permits opening of a locked guard from outside the danger zone without tools. For mounting, see the mounting supplement.
The safety outputs are switched off when the emergency release is actuated. Use the safety outputs to generate a stop command.
The monitoring output OUT is switched off; OUTD can assume an undened state. Open the guard and close it again after
resetting the emergency release. The device will then operate normally again.
Important!
ÌIt must be possible to operate the emergency release manually from outside the protected area
without tools.
ÌThe emergency release must possess a marking indicating that it may be used only in an emergen-
cy.
ÌThe actuator must not be under tensile stress during manual release.
ÌThe emergency release must be sealed or the misuse of the release function must be prevented in
the control system.
ÌThe release function meets all other requirements from ENISO14119.
ÌThe emergency release meets the requirements of Category B according to
ENISO13849-1:2015.
ÌLoss of the release function due to mounting errors or damage during mounting.
ÌCheck the release function every time after mounting.
ÌPlease observe the notes on any enclosed data sheets.
7.2.1. Actuating emergency release
Turn emergency release clockwise until it clicks into place.
¨Guard locking is released.
To reset, press the snap-in bolt inward using a small screwdriver or similar tool and turn
the emergency release back.
25
30,4
L
Snap-in bolt

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
14 (Translation of the original operating instructions) 2110788-13-03/20
7.3. Escape release (optional)
Permits opening of a locked guard from the danger zone without tools (see chapter 13.2. Di‑
mension drawing for safety switch CET.‑AR‑… on page 44).
The safety outputs are switched off when the escape release is actuated. Use the safety
outputs to generate a stop command.
The monitoring output OUT is switched off; OUTD can assume an undened state. Open the guard
and close it again after resetting the escape release. The device will then operate normally again.
Important!
ÌIt must be possible to actuate the escape release manually from in-
side the protected area without tools.
ÌIt must not be possible to reach the escape release from the outside.
ÌThe actuator must not be under tensile stress during manual release.
ÌThe escape release meets the requirements of Category B according
to ENISO13849-1:2015.
7.3.1. Actuating escape release
Press the red release knob to the stop.
¨Guard locking is released.
Pull the knob out again to reset.

15
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
7.4. Wire front release (optional)
Release via a pull wire. Depending on the type of attachment, the wire front release can be used as
emergency release or escape release.
The following applies to non-latching wire front releases:
If the release is to be used as an emergency release, one of the following measures must be taken
(see EN ISO 14119:2013, section 5.7.5.3):
ÌInstall the release so that it can be reset only with the aid of a tool.
ÌAlternatively, resetting can be realized at the control-system level by means of a plausibility check
(status of the safety outputs does not match the guard locking control signal), for example.
The emergency-release specications in chapter 7.2 on Page 13 apply irrespective of this infor-
mation.
Important!
ÌThe wire front release meets the requirements of Category B according to ENISO13849-1:2015.
ÌThe correct function depends on the laying of the pull wire and the attachment of the pull handle,
and this is the responsibility of the plant manufacturer.
ÌThe actuator must not be under tensile stress during manual release.
7.4.1. Laying wire front release
Important!
ÌLoss of the release function due to mounting errors, damage or wear.
ÌCheck the release function every time after mounting.
ÌWhen routing the wire front release, ensure that it operates smoothly.
ÌObserve the min. bending radius (100mm) and minimize the number of bends.
ÌThe switch is not allowed to be opened.
ÌPlease observe the notes on the enclosed data sheets.
8. Changing the approach direction
1. Remove the screws from the safety switch and take the head off the safety switch.
2. Place the ramp in the required approach direction.
3. Tighten the screws with a torque of 1.5Nm.
Figure 1: Changing the approach direction

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
16 (Translation of the original operating instructions) 2110788-13-03/20
9. Mounting
CAUTION
Safety switches must not be bypassed (bridging of contacts), turned away, removed or otherwise
rendered ineffective.
ÌObserve ENISO14119:2013, section 7, for information about reducing the possibilities for by-
passing an interlocking device.
NOTICE
Risk of damage to equipment and malfunctions as a result of incorrect installation.
ÌSafety switches and actuators must not be used as an end stop.
ÌObserve ENISO14119:2013, sections 5.2 and 5.3, for information about mounting the safety
switch and the actuator.
ÌProtect the switch head against damage, as well as penetrating foreign objects such as swarf,
sand and blasting shot, etc. The switch should be installed with the actuating head down for this
purpose.
ÌObserve the min. door radii (see Figure 2).
ÌEnsure that the actuator contacts the ramp in the designated area (see gure below). Marks on the
ramp specify the prescribed approach zone.
Tip!
EUCHNER offers special cover plates to improve protection against tampering. These accessories
can be found at www.euchner.com.
min. R=300
min. R=1000
min. R=800
Figure 2: Installation situation and door radii

17
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
Note the following points:
Actuator and safety switch must be tted so that
Ìthe active faces of the actuator and the safety switch are parallel with each other.
Ìthe actuator is fully inserted into the switch recess when the guard is closed.
Ìno dirt can accumulate in the recess.
Approach zone
!
!
= 90°
74,5 ± 4 mm

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
18 (Translation of the original operating instructions) 2110788-13-03/20
10. Electrical connection
The following connection options are available:
ÌSeparate operation
ÌSeries connection with Y-distributors from EUCHNER (only with M12 plug connectors)
ÌSeries connection, e.g. with wiring in the control cabinet
ÌOperation on an AR evaluation unit
WARNING
In the event of a fault, loss of the safety function due to incorrect connection.
ÌTo ensure safety, both safety outputs (OA and OB) must always be evaluated.
ÌMonitoring outputs must not be used as safety outputs.
ÌLay the connecting cables with protection to prevent the risk of short circuits.
CAUTION
Risk of damage to equipment or malfunctions as a result of incorrect connection.
ÌThe power supply for the evaluation electronics is electrically isolated from the power supply for
the guard locking solenoid.
ÌThe following is valid for all CET1/2 and devices with plug connectors 2 x M12:
The teach-in input and feedback loop, as well as the freely controllable LEDs, have the same
ground potential as the guard locking solenoid.
ÌDo not use a control system with pulsing or switch off the pulsing function in your control system.
The device generates its own test pulses on the output lines OA/OB. A downstream control system
must tolerate these test pulses, which may have a length of up to 1ms.
The test pulses are also output when the safety outputs are switched off.
Depending on the inertia of the downstream device (control system, relay, etc.), this can lead to
short switching processes.
ÌThe inputs on an evaluation unit connected must be positive-switching, as the two outputs on the
safety switch deliver a level of +24V in the switched-on state.
ÌThe device is not suitable for operation on earth-leakage monitors.
ÌAll 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 (PELV).
ÌAll electrical outputs must have an adequate protective circuit for inductive loads. The outputs
must be protected with a free-wheeling diode for this purpose. RC interference suppression units
must not be used.
ÌPower devices which are a powerful source of interference must be installed in a separate location
away from the input and output circuits for signal processing. The cable routing for safety circuits
should be as far away as possible from the cables of the power circuits.
ÌTo avoid EMC interference, the physical environmental and operating conditions at the in-
stallation site of the device must comply with the requirements according to the standard
EN60204-1:2006, section 4.4.2 (EMC).
Pay attention to any interference elds from devices such as frequency converters or induction
heating systems. Observe the EMC instructions in the manuals from the respective manufacturer.
Important!
If the device does not appear to function when operating voltage is applied (e.g. green STATE LED
does not ash), the safety switch must be returned unopened to the manufacturer.

19
2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
10.1. Notes about
Important!
ÌThis device is intended to be used with a Class 2 power source in accordance with UL1310.
As an alternative an LV/C (Limited Voltage/Current) power source with the following properties can
be used:
- This device shall be used with a suitable isolating source in conjunction with a fuse in accordance
with UL248. The fuse shall be rated max. 3.3A and be installed in the max. 30VDC power supply
to the device in order to limit the available current to comply with the requirements. Please note
possibly lower connection ratings for your device (refer to the technical data).
ÌFor use and applications as per the requirements 1), a connecting cable listed under UL cate-
gory code CYJV/7 must be used.
1) Note on the scope of the UL approval: the devices have been tested as per the requirements of UL508 and CSA/ C22.2 no. 14 (protection against electric shock
and re).
10.2. Safety in case of faults
ÌThe operating voltage UBand the solenoid voltage UCM are reverse polarity protected.
ÌThe safety outputs OA/OB are short circuit-proof.
ÌA short circuit between OA and OB is detected by the switch.
ÌA short circuit in the cable can be excluded by laying the cable with protection.
10.3. Fuse protection for power supply
The power supply must be provided with fuse protection depending on the number of switches and current required for the
outputs. The following rules apply:
Max. current consumption of an individual switch Imax
Imax = IUB + IOUT + IOA+OB (+ IOUTD*)
IUB = Switch operating current (80mA)
IOUT/ IOUT D = Load current of monitoring outputs (2 x max. 50mA)
IOA+OB = Load current of safety outputs OA + OB (2 x max. 200mA)
* only for version with door monitoring output
Max. current consumption of a switch chain ΣImax
ΣImax = IOA+OB + nx(IUB + IOUT (+ IOUTD*))
n = Number of connected switches
* only for version with door monitoring output

Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
20 (Translation of the original operating instructions) 2110788-13-03/20
10.4. Requirements for connecting cables
CAUTION
Risk of damage to equipment or malfunctions as a result of incorrect connecting cables.
ÌUse connection components and connecting cables from EUCHNER.
ÌOn the use of other connection components, the requirements in the following table apply.
EUCHNER provides no warranty for safe function in case of failure to comply with these require-
ments.
Observe the following requirements with respect to the connecting cables:
For safety switch CET-AR with plug connectors 2 x M12
Parameter Value Unit
Conductor cross-section, min. 0.25 mm²
R max. 60 W/km
C max. 120 nF/km
L max. 0.65 mH/km
Recommended cable type LIYY 8 x 0.25mm²
For safety switch CET-AR with plug connector M23 (RC18)
Parameter Value Unit
Conductor cross-section, min. 0.25 mm²
R max. 60 W/km
C max. 120 nF/km
L max. 0.65 mH/km
Recommended cable type LIFY11Y min. 19-core