NORSTAT Safety Relays - Handbuch (Seite 19)

application guide safety relays from riese electronic page 19
2 Safety gates according to EN 1088
Movable covers are required, if the dangerous
area has to be entered very often, in order to
load, unload or fix the machine. The cover has to
be designed in a way, that if it is opened, the
machine or the dangerous actions have to stop. If
this stop is not possible as quick as the cover can
be opened, the cover has to be locked as long as
the dangerous action is in effect.
Requirements of a safety switch according to BG-GS-ET-15 :
ƒ positive guided opening of the normally closed contacts
ƒ form conclusiveness of the active part of the switch
ƒ the switching loop can withstand a voltage peek of 2500 V
ƒ galvanic separation of the switching parts
ƒ non reversible with simple tools
Safety switch categories
Category 1 : Switches, where the switching element and the operation element form a unit by design
and function.
Category 2 : Switches, where the switching element and the operation element do not form a unit by
design, but during opening and closing they will come together by the function.
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