NORSTAT Safety Relays Benutzerhandbuch
Seite 77
application guide safety relays from riese electronic
page 73
Single channel protection door monitor ing
with opposite polarity between channels
If the safety switch S1 is closed the output
contacts remain unchanged. The device will be
activated by pressing the release switch.
Contacts 13-14, 23-24 and 77-78 close with a
delay of approx. 100 ms. While opening the
safety switch the contacts return to their normal
position without delay. The contact 77-78 remains
open during the selected time delay.
With this application the requirement of
redundancy in the protection door switch is not
accomplished.
Suitable up to category 2; SIL1; PLd reachable
Dual channel protection door mo nitoring
without opposite polarity between channels
In this application the terminals K22 and K12 are
not bridged. The function is similar to application
No. 7. In this application a fault in the safety
switch will be detected.
Suitable up to category 3; SIL2; PLd reachable
Dual channel protection door monitoring with
opposite polarity between channels
If the safety switches S1 and S2 are closed, the
output contacts remain unchanged. Through a
short operation of the release switch contacts 13-
14, 23-24 and 77-78 close after a delay of
approximately 100 ms.
After opening the safety switches the contacts 13-
14 and 23-24 return to their normal position
without delay. The contact 77-78 remains open
during the selected time delay.
up to category ...
immediate switching: 4; SIL3; PLe reachable,
time delayed output: 3; SIL2; PLd reachable
T12
T11
X2
T34/
X1
K22
S1
S1
77
K21 PE/
B2
13
23
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ei
ga
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/
re
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T11 T34/
X1
X2
K22
T12
S1
13
K21 PE/
B2
23
77
Fr
ei
ga
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S2
T12
X1
K21
T11
T34/
X2
S1
B2
PE/
K22
S2
13
23
77
Freigabe/
release
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866
Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com