NORSTAT Safety Relays - Handbuch (Seite 58)

application guide safety relays from riese electronic page 55
Dual channel emergency circuit with external
contact expansion (one contactor) and
contact monitoring.
Contacts 13-14 close when the safety relay is
activated through the start button contact. The
external contactor will energize. Since the
external contactor has contacts with positive
guidance the correct switching of the external
contactor can be controlled through terminals X1
and X2.
In case of welding of one of the external normally
open contacts the normally closed contact
remains open. The safety relay and the external
contactors can not be activated.
In this application the redundancy of the external
contacts is not accomplished.
Suitable up to category:
- Safety outputs : 3; SIL2; PLd reachable
- Contacts of Kext. : 2; SIL1; PLd reachable
Dual channel emergency circuit with external
contact extension (t wo contactors) and
contact monitoring.
This application uses dual external contactors.
Each normally closed contact of these external
contactors must be connected in series to X1 and
X2. The function is similar to application No 4.
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-NAGMP.1 is activated.
Suitable up to category:
- Safety outputs: 3; SIL2; PLd reachable
- Contacts of K1ext/K2ext.: 3; SIL2; PLd
reachable
Single channel protection door monitoring.
If the protection door 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 33-34 close with a
delay of approximately 100 ms. When opening
the protection door switch the contacts return to
their normal position without delay.
With this application the requirement of
redundancy in the protection door switch is not
accomplished.
Suitable up to category 2; SIL1; PLd reachable
T12
F
re
ig
ab
e/
re
le
as
e
T11 T33
S1 S1
X2 T34 X1 T12 T22
Not-
STOP
E-
Halt/
T22
Kext
X1
ST
AR
T
T33 T11 T34 T12 X2
.
T12
13 13
13 23
14 14
K
NAGMP
ext K
33 41
.. ext Uext U
T21 T23
K2ext.
T11 T33
S
TA
R
T
X1 T34 X2
K
1e
xt
.
K
2e
xt
.
K
K1ext.
Not-
Halt/
E-
STOP
T22 T12 T12 13 33 23
14 14
13 13
NAGMP
Sext.
Uext.
41 T21 T23
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866 Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com