EUCHNER CTP User manual

EN
Operating Instructions
Transponder-Coded Safety Switch with Guard Locking
CTP/CTA-L1/2-BP Unicode/Multicode

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
2(translation of the original operating instructions) 2537377-01-05/21
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 ................................................................................... 7
6. Function............................................................................................................... 8
6.1. Guard lock monitoring.....................................................................................................................8
6.2. Monitoring outputs/status bits .........................................................................................................8
6.2.1. Guard locking signal OL...................................................................................................8
6.2.2. Door position signal OD...................................................................................................8
6.2.3. Diagnostic signal OI.........................................................................................................8
6.2.4. Escape release signal OER ..............................................................................................8
6.2.5. Status signal OM.............................................................................................................8
6.2.6. Locking element signal OLS.............................................................................................8
6.2.7. Communication connection C...........................................................................................9
6.3. Version CTP/CTA Extended..............................................................................................................9
6.4. Guard locking.................................................................................................................................9
6.4.1. Guard locking on version CTP/CTA-L1...............................................................................9
6.4.2. Guard locking on version CTP/CTA-L2...............................................................................9
6.5. Switching states ...........................................................................................................................10
7. Manual release................................................................................................... 11
7.1. Auxiliary release and auxiliary key release.......................................................................................11
7.1.1. Actuating auxiliary release .............................................................................................11
7.1.2. Actuating auxiliary key release .......................................................................................12
7.2. Emergency release .......................................................................................................................12
7.2.1. Actuating emergency release.........................................................................................12
7.3. Escape release.............................................................................................................................13
7.3.1. Actuating escape release...............................................................................................13
7.4. Wire front release (bowden) ...........................................................................................................13
7.4.1. Laying wire front release................................................................................................14
8. Changing the approach direction ........................................................................ 14
4. Mounting............................................................................................................ 15
5. Electrical connection .......................................................................................... 16
5.1. Notes about .........................................................................................................................17
5.2. Safety in case of faults..................................................................................................................17

3
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
5.3. Fuse protection for power supply...................................................................................................17
5.4. Requirements for connecting cables...............................................................................................18
5.5. Connector assignment of safety switch CTP/CTA-…-BP-…-SII-…
with plug connectors 2 x M12........................................................................................................19
5.6. Connector assignment of safety switch CTP/CTA-…-BP-…-SA-…
with plug connector M12, 8-pin......................................................................................................19
5.7. Connection...................................................................................................................................20
6. Using communication data.................................................................................. 21
6.1. Connection to a BR/IO-Link Gateway GWY-CB..................................................................................21
6.2. Connection to a safety relay ESM-CB..............................................................................................21
6.3. Overview of the communication data..............................................................................................21
6.3.1. Cyclical data (process data)...........................................................................................21
6.3.2. Acyclical data (device data and events)...........................................................................22
6.4. Notes on operation with safe control systems.................................................................................23
6.5. Connection of guard locking control ...............................................................................................23
6.5.1. Guard locking control for variants with IMM connection ....................................................23
6.5.2. Guard locking control for variants without IMM connection................................................23
7. Setup ................................................................................................................. 24
7.1. LED displays ................................................................................................................................24
7.2. Teach-in function for actuator (only for unicode evaluation) ...............................................................24
7.2.1. Actuator teach-in...........................................................................................................25
4.1. Functional check...........................................................................................................................25
4.1.1. Mechanical function test................................................................................................25
4.1.2. Electrical function test...................................................................................................25
4.1. Factory reset................................................................................................................................25
5. System status table CTP/CTA-L1/2-BP................................................................ 26
6. Technical data .................................................................................................... 27
6.1. Technical data for safety switch CTP-L1/2-BP..................................................................................27
6.2. Technical data for safety switch CTA-L1/2-BP..................................................................................28
6.3. Typical system times.....................................................................................................................29
6.4. Dimension drawing for safety switch CTP/CTA….............................................................................30
6.4.1. Dimension drawing for safety switch CTP… ....................................................................30
6.4.2. Dimension drawing for safety switch CTA… ....................................................................31
6.4.3. Dimension drawing for connections and variants CTP/CTA …...........................................32
6.5. Technical data for actuator CTP/CTA-…..........................................................................................33
6.5.1. Dimension drawing for actuator CTP/CTA-… ...................................................................34
7. Ordering information and accessories................................................................. 37
8. Inspection and service ........................................................................................ 37
9. Service .............................................................................................................. 37
10. Declaration of conformity ................................................................................... 38

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
4(translation of the original operating instructions) 2537377-01-05/21
1. About this document
1.1. Scope
These operating instructions are valid for all CTP-L1/2-BP and CTA-L1/2-BP… from version V1.0.0. These operating instruc-
tions, the document Safety information and any enclosed data sheet form the complete user information for your device.
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
(2537377) (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
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
2. Correct use
Safety switches series CTP-L1/2-… and CTA-L1/2-… are interlocking devices with guard locking solenoid (type 4). The
device meets the requirements 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 command
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.
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 CTP/CTA components
Safety switch
Actuator
A-C-H-… A-C-H-…-165497
CTP-L1/2-BP Unicode/Multicode
CTA-L1/2-BP Unicode/Multicode
Key to symbols Combination possible

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
6(translation of the original operating instructions) 2537377-01-05/21
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 6.5. Switching states on page 10):
- 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)).
ÌSafety characteristics: category, Performance Level, PFHD(see chapter 6. Technical data on page 27).
Control of guard locking for variants with IMP/IMM connection
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 the guard locking is dened only by the external control (e.g. PFHD, ext. for the standstill
monitor).
Guardlocking Device
PFHDext.
(e.g. standstill
monitor)
(locking mean)

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2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
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.
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 system 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 fulll
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.

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
8(translation of the original operating instructions) 2537377-01-05/21
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 (multi-
code) 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 unicode evalu-
ation, 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 evaluation). There is no exact comparison of the actuator code with
the taught-in code in the safety switch (unicode evaluation). The system possesses a low coding level.
When the guard is closed, the actuator is moved into the safety switch. When the operating distances are reached, power
is supplied to the actuator by the switch and data are transferred.
If a permissible code is detected, the safety outputs are switched on.
The safety outputs are switched off when the guard is released.
In the event of a fault in the safety switch, the safety outputs are switched off and the DIA LED illuminates red. The occurrence
of faults is detected at the latest on the next demand to close the safety outputs (e.g.on starting).
6.1. Guard lock monitoring
All versions feature two safe outputs for monitoring guard locking. The safety outputs FO1A and FO1B are switched off
when guard locking is released.
6.2. Monitoring outputs/status bits
Depending on version, the signals listed in the following are available as a status bit or on the monitoring output. The status
bits are evaluated via the BR/IO-Link Gateway. Please refer to the enclosed data sheet for further information.
6.2.1. Guard locking signal OL
The guard locking signal is present if the guard locking is active.
6.2.2. Door position signal OD
The door position signal is sent as soon as the actuator is inserted into the switch head (state: guard closed and not locked).
The signal is also present if the guard locking is active.
6.2.3. Diagnostic signal OI
The diagnostic signal is present if there is an error (switch-on condition as for DIA LED).
6.2.4. Escape release signal OER
The escape release signal is present if the device has been released manually (see chapter 7. Manual release on page 11).
The signal is reset if the guard locking is re-activated or the reset function has been activated.
6.2.5. Status signal OM
The status signal is present if the device’s safety outputs are switched.
6.2.6. Locking element signal OLS
The locking element signal is present if the locking element is stuck and it is therefore not possible to activate/deactivate
guard locking. The signal is reset as soon as the actuator is no longer under tensile stress.
Transponder-coded
actuator
Guard locking pin

9
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
6.2.7. Communication connection C
A monitoring output with the sufx C has the additional function of providing a communication connection to a BR/IO-Link
Gateway. The switch delivers cyclical and acyclical data. You will nd an overview of the communication data in chapter 6.
Using communication data on page 21.
If no BR/IO-Link Gateway is connected, this output behaves like a monitoring output.
6.3. Version CTP/CTA Extended
Devices in the Extended version contain additional controls/indicators in the housing cover. Please refer to the enclosed
data sheet for further information.
6.4. Guard locking
6.4.1. Guard locking on version CTP/CTA-L1
(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 cannot be pulled out of the switch and the guard is locked as long as the guard locking pin is extended.
If a voltage is applied to the guard locking solenoid, the guard locking pin is retracted and the actuator is released. The
guard can be opened.
6.4.2. Guard locking on version CTP/CTA-L2
(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 no voltage is applied to the guard locking solenoid.
If a voltage is applied to the guard locking solenoid, the guard locking pin is held in the extended position and the guard is
locked.

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
10 (translation of the original operating instructions) 2537377-01-05/21
6.5. Switching states
The detailed switching states for your switch can be found in the system status table (see chapter 5. System status table
CTP/CTA-L1/2-BP on page 26). All safety outputs, signals and display LEDs are described there.
Guard closed and locked
UA
0V
Guard closed and not locked
IMP
IMM
Guard open
IM
P
IM
M
Voltage at guard locking solenoid
CTP/CTA-L1 off on (irrelevant)
Voltage at guard locking solenoid
CTP/CTA-L2 on off (irrelevant)
Safety outputs FO1A and FO1B on off off
Guard locking signal OL on off off
Door position signal OD on on off

11
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
7. Manual release
Important!
S1
S2
S3
No further release functions can be retrotted on Extended variants with control elements in position1
(S1) and position 2 (S2).
Some situations require the guard locking to be released manually (e.g. malfunctions or an emergency). A function test must
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
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 the auxiliary key release is actuated. Use the safety outputs
to generate a stop command.
The guard locking signal OL is switched off; the door position signal OD 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.
ÌTo prevent tampering, the auxiliary release must be sealed (with seal-
ing lacquer, for example) before the switch is set up.
ÌAfter use, reset the auxiliary release and screw in and seal the locking
screw (with sealing lacquer, for example).
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.
ÌObserve 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.
Auxiliary
release
Locking
screw

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
12 (translation of the original operating instructions) 2537377-01-05/21
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.
7.2. Emergency release
It permits opening of a locked guard from outside the danger zone without tools. For mounting, see the mounting supplement.
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.
ÌObserve the notes on any enclosed data sheets.
7.2.1. Actuating emergency release
ÌTurn the 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.
The safety outputs are switched off when the emergency release is actuated. Use the safety
outputs to generate a stop command.
The guard locking signal OL is switched off; the door position signal OD 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.
Snap-in bolt

13
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
7.3. Escape release
The escape release is optional on CTP devices; on CTA devices it is optional or can be retrotted.
It permits opening of a locked guard from the danger zone without tools (see chapter 6.4.1. Dimension
drawing for safety switch CTP… on page 30).
Important!
ÌIt must be possible to operate 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
ÌPress the red release knob to the end stop.
¨Guard locking is released.
Pull the knob out again to reset.
The safety outputs are switched off when the escape release is actuated. Use the safety outputs to generate a stop command.
The guard locking signal OL is switched off; the door position signal OD 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.
7.4. Wire front release (bowden)
Release via a pull wire. Depending on the type of attachment, the wire front release can be used as an 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 12 apply irrespective of this
information.
Important!
ÌThe wire front release meets the requirements of Category B accord-
ing to ENISO13849-1:2015.
ÌThe correct function depends on the laying of the pull wire and the
attachment of the pull handle. The plant manufacturer is responsible
for proper installation; the notes from chapter 7.4.1 on Page 14
must be observed.
ÌThe actuator must not be under tensile stress during manual release.

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
14 (translation of the original operating instructions) 2537377-01-05/21
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
The approach direction needs to be changed only if the switch is to be approached from the rear.
Proceed as follows:
1. Remove the screws from the safety switch.
2. Set the required direction.
3. Tighten the screws with a torque of 1.2Nm.
C
B
D
A
Fig. 1: Changing the approach direction

15
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
4. 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.
CAUTION
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 14119:2014, sections 5.2 and 5.3, for information about mounting the safety
switch and the actuator. The following specications must be observed:
- Mounting with screws of property class 8.8 or higher.
- The minimum screw diameter for CTP devices is 4mm, for CTA devices 5mm.
- Secure the xing material against loosening (e.g. by means of medium-strength positive screw
locking).
ÌProtect the switch head against damage, as well as penetrating foreign objects such as swarf,
sand and blasting shot, etc.
ÌObserve the min. door radii (see chapter 6.5.1. Dimension drawing for actuator CTP/CTA-… on
page 34).
ÌObserve the tightening torque for mounting the switch:
- For CTP devices: max. 1.4Nm
- For CTA devices: max. 6Nm
CAUTION
Device damage or malfunctions caused by material changes due to the environment.
ÌIn accordance with section 6.3 of ENISO14119:2014, the environmental inuences (e.g. direct
UV radiation or corrosion) must be checked before a guard locking device is used.
ÌContact the manufacturer if you have any questions about environmental inuences or about use in
aggressive environments.
A clearance of 12mm must be maintained around the actuator head (see Fig. 2).
min. 12 min. 12
Fig. 2: Actuator head clearance

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
16 (translation of the original operating instructions) 2537377-01-05/21
5. Electrical connection
WARNING
In the event of a fault, loss of the safety function due to incorrect connection.
ÌTo ensure safety, both safety outputs FO1A and FO1B 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.
ÌIn devices with IMP/IMM inputs, the power supply for the evaluation electronics is electrically isolat-
ed from the power supply for 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 safety outputs. A downstream control system
must tolerate these test pulses, which may have a length of up to 300µs.
The test pulses are output only with the safety outputs switched off during device start.
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.
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
insulation 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 installation
site of the device must comply with the requirements according to the standard EN60204-1
(EMC).
ÌPay 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.

17
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
5.1. 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 30VDC power supply to
the device as per the UL requirements. Please note possibly lower connection ratings for your
device (refer to the technical data).
ÌFor use and application as per the requirements of UL 1) a connecting cable listed under the UL
category code CYJV/7, min. 24AWG, min. 80°C, 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).
5.2. Safety in case of faults
ÌThe operating voltage UBand the solenoid operating voltage UIMP are reverse polarity protected.
ÌThe safety outputs FO1A/FO1B are short circuit-proof.
ÌA short circuit between FO1A and FO1B is detected by the switch.
ÌA short circuit in the cable can be excluded by laying the cable with protection.
5.3. Fuse protection for power supply
The power supply must be provided with fuse protection depending on the number of switches and the current required for
the outputs. The following rules apply:
Max. current consumption of an individual switch Imax
Imax = IUB + IFO1A+FO1B + IOX
IUB = Switch operating current (40mA)
IOX = Load current of monitoring output (max. 50mA per monitoring output)
IFO1A+FO1B = Load current of safety outputs FO1A + FO1B (2 x max. 150mA)
Important!
If there are further monitoring outputs, their load current must be taken into account.

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
18 (translation of the original operating instructions) 2537377-01-05/21
5.4. 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 CTP/CTA-…-BP-…-SII-… 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 or 5 x 0.34mm²
For safety switch CTP/CTA-…-BP-…-SA-… with plug connector M12, 8-pin
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

19
2537377-01-05/21 (translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
EN
5.5. Connector assignment of safety switch CTP/CTA-…-BP-…-SII-…
with plug connectors 2 x M12
Plug connector
(view of connection side) Pin Designation Function
Conductor coloring
of connecting
cable 1)
2 x M12
X2.5
X2.4
X2.3
X2.1
X2.2
X1.5
X1.4
X1.3
X1.1
X1.2
X 1.1 UB Electronics operating voltage, 24VDC BN
X 1.2 FO1A Safety output, channel A WH
X 1.3 0VUB Electronics operating voltage, 0VDC BU
X 1.4 FO1B Safety output, channel B BK
X 1.5 - n.c. GY
X 2.1 - n.c. BN
X 2.2 OD/C Door position monitoring output/communication WH
X 2.3 IMM Solenoid operating voltage, 0VDC BU
X 2.4 IMP Solenoid operating voltage, 24VDC BK
X 2.5 - n.c. GY
1) Only for standard EUCHNERconnecting cable.
5.6. Connector assignment of safety switch CTP/CTA-…-BP-…-SA-…
with plug connector M12, 8-pin
Plug connector
(view of connection side) Pin Designation Function
Conductor coloring
of connecting cable
1)
1 x M12
8
5
6
7
2
4
3
1
1 IMP Solenoid operating voltage, 24VDC WH
2 UB Electronics operating voltage, 24VDC BN
3 FO1A Safety output, channel A GN
4 FO1B Safety output, channel B YE
5 OI/C Diagnostic monitoring output/communication GY
6 OD Door position monitoring output PK
7 0VUB Electronics operating voltage, 0VDC BU
8 IMM Solenoid operating voltage, 0VDC RD
1) Only for standard EUCHNERconnecting cable.

Operating Instructions
Transponder-Coded Safety Switch CTP/CTA-L1/2-BP
20 (translation of the original operating instructions) 2537377-01-05/21
5.7. Connection
The device is connected as shown in Fig. 3. The monitoring outputs can be routed to a control system.
The switch can be reset via the RST input. To do this, a voltage of 24V is applied to the RST input for at least 3s. The RST
input must be connected to 0V if it is not used.
If there is an internal error (see chapter 5. System status table CTP/CTA-L1/2-BP on page 26), the reset does not work.
WARNING
In the event of a fault, loss of the safety function due to incorrect connection.
ÌTo ensure safety, both safety outputs FO1A and FO1B must always be evaluated.
Important!
ÌThe example shows only an excerpt that is relevant for connection of the CTP/CTA system.
The example illustrated here does not show complete system planning. The user is responsi-
ble for safe integration into the overall system. Detailed application examples can be found at
www.euchner.com. Simply enter the order number of your switch in the search box. You will nd all
available connection examples for the device in Downloads.
Safety Outputs
Door
Monitoring
Monitoring Outputs
Read Head
Actuator
Diagnostic
-B1 UB
2
0 V
UB
7
OD
6
FO1A
3
FO1B
4
OI/C
5
IMP
1
IMM
8
Connected load
1
2
-F1
13
14
-S1
24V DC
0 V
24V DC
0 V
Fig. 3: Connection example; version with plug connectors 2xM12