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CES-AR-CL2-AH
User Manual
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EUCHNER CES-AR-CL2-AH User Manual

Operating Instructions
Non-Contact Safety Switch
CES-AR-CR2-AH (Unicode)
CES-AR-CL2-AH (Unicode)
More than safety.
Operating Instructions Safety Switches CES-AR-C.2-AH
Contents
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Operating Instructions Safety Switches CES-AR-C.2-AH
Correct use
The Coded Electronic Safety switches series CES are safety devices for monitor­ing movable safety guards.
In combination with a separating safety guard and the machine control, this safety  component  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. 
Before safety switches are used, a risk assessment must be performed on the  machine, e.g., in accordance with:
 Ì EN ISO 13849-1, Safety of machinery. Safety related parts of control systems. 
General principles for design
 Ì EN ISO 12100, Safety of machinery – General principles for design – Risk as-
sessment and risk reduction
 Ì 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, for example
Important!
 Ì EN ISO 13849-1, Safety of machinery. Safety related parts of control systems. 
General principles for design
 Ì EN 1088, Safety of machinery. Interlocking devices associated with guards. 
Principles for design and selection
 Ì EN 60204-1, Safety of machinery. Electrical equipment of machines. General 
requirements
 Ì EN 60947-5-3, Specification for low-voltage switchgear and controlgear. Con-
trol circuit devices and switching elements. Requirements for proximity devices  with defined behaviour under fault conditions
The safety switch must be used only in conjunction with the designated CES ac­tuators from EUCHNER. On the use of different actuators, EUCHNER provides no  warranty for safe function.
Several devices are only allowed to be connected in series using devices intended  for  series  connection  with  the  CES-AR.  Check  the  operating  instructions  for  the  related device. A combination of other CES devices or devices from other manu­facturers is not allowed.
A maximum of 20 safety switches are allowed to be operated in a switch chain. 
 Ì 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. in ac­cordance with EN ISO 13849-2.
 Ì Correct use requires observing the permissible operating parameters (see 
Technical data).
 Ì 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.
 Ì In the estimation of the PL for the overall system, a maximum value of 
100 years can be assumed for the MTTFd according to the limit value in  EN ISO 13849-1:2008, section 4.5.2. This corresponds to a minimum value  for the PFHd of 2.47x10-8/h. 
 Ì 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. 
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Operating Instructions Safety Switches CES-AR-C.2-AH
Important!
Safety switch
Door hinge right
CES-AR-CR2-AH
Door hinge left
CES-AR-CL2-CH
 Ì In the case of series connection of more than 11 devices, the PFH
calculated according to one of the stated methods in EN ISO 13849-1:2008,  Section 4.5.1. 
 Ì 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.
 Ì It is only allowed to use components that are permissible in accordance with 
the table below.
Possible combinations for CES components
Actuator
Door hinge right
CES-A-BLN-R2-100776
100776
Door hinge left
CES-A-BLN-L2-104510
104510
Usage independent of position of door hinge
CES-A-BLN-U2-103450
103450
Usage independent of position of door hinge
CES-A-BDN-06-104730
104730
 can be 
d
Key to symbols
Combination possible
Note!
Devices with version number V 1.1.2 or higher can be operated on an AR evalua­tion unit. Please refer to the operating instructions for the relevant AR evaluation  unit for more information.
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Operating Instructions Safety Switches CES-AR-C.2-AH
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.
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 particularly
 Ì after any setup work  Ì after the replacement of a CES component  Ì after an extended period without use  Ì 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.
Warning!
Important!
Danger of fatal injury in the event of incorrect connection or incorrect use. 
 Ì 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 pos­sibility 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 
 Ì who are familiar with the correct handling of safety components    Ì who are familiar with the applicable EMC regulations  Ì who are familiar with the applicable regulations on health and safety and ac-
cident prevention   
 Ì who have read and understood the operating instructions.
Prior to use,  read the  operating instructions  and  keep these  in  a safe  place.  Ensure that the operating instructions are always available during  mounting,  setup and servicing work. EUCHNER cannot provide any warranty in relation to  the readability of the CD  for the  storage period required. For this reason you  should archive a printed copy of the operating instructions. You can download  the operating instructions from www.EUCHNER.de.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Function
The device meets the following safety requirements:
 Ì Category 4, PLe according to EN ISO 13849-1  Ì Redundant design of the circuit in the unit with self-monitoring  Ì This means that the safety system still functions even if an internal component 
fails
 Ì The switch state of the semiconductor outputs is continuously monitored inter-
nally
 Ì Short circuit detection at the safety outputs by pulsed signals
The following switch-on condition applies  to safety outputs OA and OB (see also  System status table and the section Typical system times):
 Ì Safety guard closed  Ì Both safety outputs (IA and IB) must be on
The system consists of the following components: coded actuator (transponder)  and switch.
Each actuator has a unique electronic coding and is therefore a unique element.  The code in an actuator cannot be reprogrammed.
The actuator must be assigned to the safety switch by a teach-in process so that  it is detected by the system. This unambiguous assignment ensures a particularly  high level of protection against tampering.
The safety switch is fastened to the fixed part of the safety guard. 
The actuator attached to the movable part of the safety guard is moved towards  the read head fitted in the safety switch by closing the door. When the switch-on  distance is reached, power is supplied to the actuator by the read head by induc­tion and data can be transferred.
The bit pattern read is compared with the code saved in the safety switch. If the  data match, the safety outputs are enabled.
Due to the combination of dynamic polling of the actuator and  the  redundant,  diverse design of the safety electronics with the two feedback safety outputs, the  safety switch will enter the safe state with every detectable fault. 
When the safety guard is opened, the safety outputs switch off the safety circuit  and the monitoring output OUT is switched off. The state of the safety outputs is  monitored internally by two microprocessors. 
If faults are detected, the safety circuit is switched off and the DIA LED illuminates.  In case of devices with a DIA monitoring output, the output is switched on.
The safety switch has a redundant circuit design with self-monitoring. This means  that the safety system is still effective even if a component fails.
The system is designed so that failures will not result in the loss of the safety func­tion. The occurrence of failures is detected by cyclic self-monitoring at the latest  on the next demand to close the safety contacts (e.g. on starting). 
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Operating Instructions Safety Switches CES-AR-C.2-AH
If the safety door with the actuator should settle over time, the actuator can drift  out of the read head operating distance. The device recognizes this and indicates  that the actuator is in the boundary area (function available for V 1.1.2 and higher).  This allows the safety door to be readjusted in time.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Mounting
Caution!
Safety  switches  must  not  be  bypassed  (bridging  of  contacts),  turned  away,  removed or otherwise rendered ineffective.
 Ì On this topic pay attention in particular to the measures for reducing the pos-
sibility 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. 
 Ì Fit an additional end stop for the movable part of the safety guard.
Important!
 Ì From the assured switch-off distance S
down.
, the safety outputs are safely shut 
ar
 Ì When mounting several safety switches, observe the stipulated minimum 
distance to avoid mutual interference.
min. 120 mm
 Ì The operating distance changes during the mounting of the actuator as a 
function of the material used for the safety guard.
Note the following points:
 Ì Actuator and safety switch must be easily accessible for inspection and re-
placement.
 Ì The switching operation must only be triggered by the specific actuator desig-
nated for this purpose. For permissible combinations please see the Table Pos- sible combinations for CES components on page 4.
 Ì Actuator and safety switch must be fitted so that
 Ì the front faces are at the minimum switch-on distance 0.8 x S
when the safety guard is closed (see section Operating distances). A mini­mum distance dependent on the actuator must be maintained for a side ap­proach direction:    - For CES-A-BLN-R2    6 mm 
        - For CES-A-BLN-L2    6 mm 
        - For CES-A-BLN-U2    6 mm 
        - For CES-A-BDN-06    8 mm
 Ì when the safety guard is open up to the distance S
tance), a hazard is excluded.
 (assured switch-off dis-
ar
 or closer 
ao
 Ì the actuator is positively mounted on the safety guard, e.g. by using the 
safety screws included.
 Ì they cannot be removed or tampered with using simple means.  Ì Pay attention to the maximum tightening torque for the safety switch and 
actuator mountings of 1 Nm.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Electrical connection
The following connection options are available:
 Ì Separate operation  Ì Series connection with Y-distributors from EUCHNER (only with M12 plug con-
nector)
 Ì Series connection, e. g. with wiring in the control cabinet  Ì Operation on an AR evaluation unit.
Warning!
In case of an error, loss of the safety function through incorrect connection.
 Ì To ensure safety, both safety outputs (OA and OB) must always be evaluated.  Ì The monitoring output OUT must not be used as a safety output.  Ì Lay the connection cables with protection to prevent the risk of short cir-
cuits.
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connection.
 Ì Do not use a control system with pulsing or switch off the pulsing function in 
your control system. The device generates its own pulse signal on the out­put lines OA/OB. A downstream control system must tolerate these pulses,  which may have a length of up to 1 ms.  The pulses are also output when the safety outputs are switched off.   Depending on the inertia of the connected device (control system, relay,  etc.), this can lead to short switching processes.
 Ì The 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.
 Ì 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 (PELV).
 Ì For use and operation as per the   requirements, a power supply with the 
feature "for use in class 2 circuits" must be used. The same requirement ap­plies to the safety outputs. Alternative solutions must comply with the following requirements: a) Electrically isolated power supply unit with a max. open-circuit voltage of 30 
V/DC and a limited current of max. 8 A.
b) Electrically isolated power supply unit in combination 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.
 Ì For use and applications as per the requirements of  , a connection cable 
listed under the UL category code CYJV2 must be used and the following  requirements met: The connection cables of EUCHNER meet these require­ments. The same requirement applies to the safety outputs.
 Ì All 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.
* Note on the scope of the UL approval: Only for applications as per NFPA 79 (Industrial Machinery) The devices are tested according to the requirements of UL508 (protection against electric shock and fire).
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Operating Instructions Safety Switches CES-AR-C.2-AH
Caution!
 Ì Power 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.
 Ì 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).
 Ì Please pay attention to any interference fields in case of 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 flash), the safety switch must be returned unopened  to the manufacturer.
Safety in case of faults
 Ì The operating voltage U
 is reverse polarity protected. 
B
 Ì The contacts OA/OB are short circuit-proof  Ì A short circuit between OA and OB is detected by the switch.   Ì A short circuit in the cable can be excluded by laying the cable with protection. 
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 I
I
   = IUB + I
max
   = Switch operating current (50 mA)
I
UB
   = Monitoring output load current (max. 50 mA)
I
OUT
 = Load current of safety outputs OA + OB (2 x max. 200 mA)
I
OA+OB
OUT
 + I
OA+OB
Max. current consumption of a switch chain Σ I
Σ I
max
 = I
 + n x (IUB + I
OA+OB
OUT
)
n  = Number of connected switches
max
max
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Operating Instructions Safety Switches CES-AR-C.2-AH
Requirements for connection cables
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connec­tion cables.
 Ì Use connection components and connection cables from EUCHNER  Ì On the usage of other connection components, the requirements in the fol-
lowing table apply. EUCHNER provides no warranty for safe function in case  of failure to comply with these requirements. 
Observe the following requirements with respect to the connection cables:
Parameter Value Unit
Conductor cross-section min. 0.34 mm² R max. 60 W/km C max. 120 nF/km L max. 0.65 mH/km Recommended cable type LIYY 8x or 5x 0.34 mm²
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