Version 10.12.2019
WERAC Elektronik GmbH
page 7
A, B, C and D = contactors or relays with positively driven contacts..
T = operating device (pushbutton) which has to be pressed for start-up (release of the starting
and the restart lockout). The identifying marking of the pushbutton must be located near this
component.
It must be impossible to press the pushbutton T from inside the danger area.
x, y = Two-channel implementation in the controller of the PDM for interruption of the
movement. Note: Performance Level PL e, category 4 according to EN
ISO 13849-1.
z = Variant with only single-channel control of the PDM. Important: Maximum performance
level PL c, category 2 according to EN ISO 13849-1 is achieved in this case.
Note: The declaration of the performance level and category according to EN ISO 13849-1 is
only valid for the entirety of the shown elements. If additional contacts are needed, they must
be implemented according to the required safety category.
6
Applications and assembly instructions
The safety light grids (ESPE = Electro-Sensitive Protective Equipment, here with control units
WGN 100 or WGN 110) are used for the
access protection of danger zones and
safeguarding hazardous points on power-driven machinery
in compliance with the safety
engineering requirements as stated in this description, the standard EN 999 (ISO 13855) and
the type C standards of the corresponding machinery.
Operation e.g. in the following areas of operation is possible:
Operating machines for the chemicals, rubber and plastics industries as defined by VBG 22
Printing and paper converting machinery as defined by prEN 1010-1 to -5
Conveying equipment
Power driven windows, doors and gates as defined by BGR 232 (former ZH 1/494)
Storage facilities and equipment as defined by BGR 234 and EN 15095
Food processing machines as defined by EN 12852:2001 and/or BGV D18 (former VBG 77)
Robots
Textile machines as defined by VBG and DIN EN ISO 11 111
Packaging machines as defined by DIN EN 415-1 to -7 and/or BGV D17 (früher VBG 76)
The above individual applications were not an object of the EC type-test.
6.1
General remarks
The operating device for start-up (pushbutton T) must be installed in such a way that a good
overview of the danger area is provided from its operating position. Actuation of the operating
device from inside the danger area must be excluded.
The ESPE must be installed in such a way that the dangerous points can only be reached
through the guarded area.
6.2
Safeguarding hazardous points by means of a light grid
Safety distance
An adequate safety distance between the guarded area and the hazardous points must be
provided, so that if the guarded area is entered, the dangerous movement is interrupted before
the dangerous points can be reached.
S:
Safety distance
H:
Height of guarded area
Danger
area
S
H
Fig. 4: Safety distance
