NORSTAT Safety Relays Benutzerhandbuch
Seite 76
application guide safety relays from riese electronic
page 72
T11
T34/
X1
K21
13
X2
T12
PE/
K22
B2
23
77
Not-
Halt/
E-
STOP
START
T11
K2ext.
T12
K21 T34/
X2
77
K22
PE/
13
23
X1
B2
Not-
Halt/
E-
STOP
K2ext
K1ext
START
Uext
14
14
NAGT
NAGT.1
K1ext.
13
13
Sext
K
Dual channel emergency stop with start
monitoring and opposite polarity between
channels
In this application, the proper turn-on and turn-off
of the start-button is checked. After pressing the
start button contacts 13-14, 23-25 and 77-78
close with 100 ms delay after reopening the start
button. Pressing the emergency stop initiates a
stop and outputs 13-14 and 23-24 open
immediately. 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
Dual channel emergency stop with external
contact expansion (1contactor), contact
monitoring and opposite polarity between
channels
Contact 13-14 closes when the safety relay is
activated by pressing the start button and the
external contactor energizes. Since the external
contactor has contacts with positive guidance the
correct switching of the external contactor can be
controlled through terminals T34/X1 and X2. In
case of welding of one of the external contactors,
the normally open contacts remain open. The
safety relay and the external contactor will not be
activated. In this application the redundancy of
the contactor is not accomplished.
Suitable up to risk category 4 imm ediate open
output
Suitable up to risk category 3 tim
e delayed
output.
Contacts of Kext. : 2.
Dual channel emergency stop with external
contact extension ( 2contactors ), contact
monitoring and opposite polarity between
channels
This application uses two external contactors.
Each normally closed contact of these external
contactors must be connected in series to T34/X1
and X2. The function is similar to application No
5. In this application the demand of redundancy
of the contacts of the external contactors is
accomplished. Through the switch S ext. the
external contactors can be operated or turned off
at any time if the RS-NAGT is activated.
Suitable up to category 2; SIL1; PLd reachable
T11
Not-
Halt/
E-
STOP
K
K21 T34/
X1
X2
T12
ext.
START
ext
ext
K
K
..
K22
PE/
13
B2
23
77
..
NAGT
NAGT.1
14
14
K
13
13
ext
ext
U
U
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866
Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com