NORSTAT Safety Relays - Handbuch (Seite 23)

application guide safety relays from riese electronic page 22
3 Two hand controls according to DIN EN 574
There are 3 types of two hand applications :
type I : Requires two buttons to be held simultaneously with each hand during the dangerous motion of the
machine. The release of one button during the dangerous motion stops the operation.
example:
Operations where the operator do not frequently enter and leave the hazardous
environment.
application :
hedge shears, tools chucks
safety category 1 according to EN 954-1
type II : Like type I, requires release of both buttons before restart of the operation.
example :
Working very close to the dangerous area but normally not inside.
application:
machine preparation
safety category 3 according to EN 954-1
type III : Like type II, but both buttons have to be pushed within .5 s.
example :
Repeated feeding of the machine by hand, in the dangerous area.
application :
mechanical press
safety category 1 ( type III a ), 3 ( type III b ) or 4 ( type III c ) according to EN 954-1.
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866 Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com