Leuze electronic L250 Manual

L250 safety locking devices
1 INFORMATION ON THIS DOCUMENT
1.1 Function
The present operating instructions provide information on installation, connection and
safe use for the following parts: L250, AC-L250-xCA.
1.2 Target audience
The operations described in these operating instructions must be carried out by quali-
fi ed personnel only, who are fully capable of understanding them, and with the techni-
cal qualifi cations required for operating the machines and systems in which the safety
devices are to be installed.
1.3 Area of application
These operating instructions apply exclusively to the devices listed in section Func-
tion, and their accessories
1.4 Original instructions
The Italian language version is the original set of operating instructions. Versions pro-
vided in other languages are translations of the original instructions.
2 SYMBOLS USED
This symbol indicates any relevant complementary information
Attention: Any failure to observe this warning note can cause damage or mal-
function, including possible loss of the safety function.
3 DESCRIPTION
3.1 Device description
The safety device described in these operating instructions is defi ned as a
coded, type-4 interlock device with guard interlocking and without contact acc. to
EN ISO 14119.
The safety switches with electromagnet and RFID technology, for which these oper-
ating instructions apply, are safety devices for the monitoring of gates, safety doors,
enclosures and all protective devices that safeguard the parts of machines.
3.2 Intended use of the device
- The device described in these operating instructions is designed to be used on
industrial machines for condition monitoring of movable protective devices.
- The direct sale of this device to the public is prohibited. Installation and use must be
carried out by qualifi ed personnel only.
- The use of the device for purposes other than those specifi ed in these operating
instructions is prohibited.
- Any use other than as expressly specifi ed in this operating manual shall be consid-
ered unintended by the manufacturer.
- Also considered unintended use:
a) Using the device after having made structural, technical, or electrical modifi ca-
tions to it;
b) Using the product in an area of application other than as described in section
TECHNICAL DATA.
4 MOUNTING INSTRUCTIONS
Attention: Installing a protective device is not suffi cient to ensure personnel
safety or compliance with machine safety standards or directives. Before installing a
protective device, perform a specifi c risk analysis in accordance with the key health
and safety requirements in the Machinery Directive. The manufacturer guarantees
only the safe functioning of the device to which these operating instructions refer, and
not the functional safety of the entire machine or system
4.1 Actuation directions
The centring symbols on the device and actuator must be aligned with each
other.
4.2 Selection of the actuator type
Attention: The switch is available with two RFID actuator types: one
with a high coding level (part AC-L250-UCA) and one with a low coding level
(part AC-L250-SCA). In the case where an actuator with a low coding level has been
chosen, ensure that the additional specifi cations prescribed in section 7.2 of the
EN ISO 14119:2013 standard are respected during installation.
Attention: If the chosen actuator has a low level of coding, any other low level
coded actuators present in the same place where the device has been installed must
be segregated and kept under strict control in order to avoid any bypassing of the
safety device. If new low level coded actuators are fi tted, the original low level coded
actuators must be disposed of or rendered inoperable.
© Leuze electronic GmbH + Co. KG, In der Braike 1, 73277 Owen, Phone: +49 (0) 7021/573-0, Fax: -199, info@leuze.de, www.leuze.com Subject to modifi cations 2019/03/22 Part no. 50142334
It is advisable to use actuators with a high coding level so as to make the installa-
tion safer and more fl exible. This will render it unnecessary to screen the device, to fi t it
in non-accessible areas or to follow other prescriptions specifi ed by the EN ISO 14119
standard for actuators with low coding level.
4.3 Selection of the operating principle
Attention: The safety switch is available with two operating principles:
1. SL operating principle (quiescent current principle – The locking element is held
in the protective position by spring force): actuator locked if electromagnet is
deactivated.
2. ML operating principle (open circuit current principle – The locking element is held
in the protective position by electromagnetic force): actuator locked if electromag-
net is activated.
With the SL operating principle (quiescent current principle), the actuator stays locked
even if the machine is disconnected from the power supply. Therefore, if the machine
has dangerous movements with inertia, inaccessibility to dangerous parts (actuator
locked) is ensured, even in the event of a sudden power failure. On the contrary, if the
machine structure allows a person to enter the danger area with their whole body and
possibly end up being stuck inside the machine, the device must be provided with an
escape release button, in order to allow the trapped person to get out even in case
of power failure.
With the ML operating principle (open circuit current principle), the actuator stays
locked only when the machine is connected to the power supply. Therefore, before
choosing this operation principle, carefully evaluate all dangers deriving from sudden
power failure with a possibly immediate actuator release.
The choice of operating principle must always be made following a risk analysis of the
specifi c application.
In case of machines without inertia, i.e. with dangerous elements being immedi-
ately blocked as soon as the safety door is opened, for which a safety device with lock
has been chosen merely to safeguard the production process, the fi rst or the second
operating principle can both be used.
4.4 Operating mode selection for activation of safety outputs
Warning: the device is available with three different safety outputs activation
modes:
- Mode 1 (part L250-Px1SL-xxx, L250-Px1ML-xxx): safety outputs active if actua-
tor is inserted and locked.
- Mode 2 (part L250-Px2SL-xxx, L250-Px2ML-xxx): safety outputs active if actu-
ator is inserted.
- Mode 3 (part L250-Px3SL-xxx, L250-Px3ML-xxx): OS1 safety output active if
actuator is inserted and locked and IS1 is active, OS2 safety output active if actua-
tor is inserted and IS2 is active.
Mode 1 activates the OS safety outputs when the actuator is both inserted and locked,
so that the actuator cannot be extracted with the safety outputs activated. In mode 1
the device is coded, type 4 (interlock with lock) acc. to EN ISO 14119.
In mode 2, the actuator can be locked/unlocked for special applications while still kept
on the safety chain, typically for specifi c applications without stopping time, when the
risk does not continue after the opening of the protective device. In mode 2 the device
is coded, type 4 (interlock without lock) acc. to EN ISO 14119.
For specifi c applications, mode 3 provides a channel with "mode 1" functionality, and a
channel with "mode 2" functionality. This allows emulation of electromechanical inter-
lock devices with guard interlocking, without complex machine wiring modifi cations.
Using modes 2 and 3 must always follow a risk analysis on the specifi c application,
with particular focus on the function of cascaded mode 3 devices.
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