NORSTAT Safety Relays - Handbuch (Seite 65)

application guide safety relays from riese electronic page 62
2-channel e-stop application with monitoring
of start cir cuit, cross circuit ch eck and
contact expansion
.
The release switch must be attached to the e-stop
circuits (S11/S12, S21/S22) and the start button must
be attached to the start-circuit (S34/S21). The outputs
will be activated after pressing of the start button.
For monitoring of the external conductors, the
NC contacts of the force guided contactors must
be attached in series to the start circuit.
Safety
category 4; SIL3; PLe reachable
Logical AND circuit of two devices.
After opening the e-stop circuits of the device
A,
the contactors K1/K2 de-energise. Because the
safety outputs of device
A have now a 0V-
potential and the device B is configured for the
AND-combination (due to the open circuit S32),
the contactors K3/K4 will be de-energised over
the S33 terminal (AND combination) too. If only
the release switch of device
B will be opened,
the contactors K3/K4 will be de-energised only.
The contactors K1/K2 remains in energised
condition. Hence device
A de-energises all its
following devices.
up to category 4; SIL3; PLe reachable
Logical OR circuit of t wo devices. (For
example a ke y switch for the plant-setup
routine)
Both devices (
A and B) are OR combined. If the
outputs of the device A have a low signal,
device B takes over control of its own outputs
and thus over the contactors K3/K4. If the
outputs of the device
A have of high signal, the
outputs of the device B have independently of its
own input circuits of high signal too, that is
contactors K3/K4 are energised.
No safety approved application!
S35
S34 S22 S12 S11 S21 S32
S33 S36 S37 14 34
K1
K2
A2
K1
K2
K1
K2
S32
S33 24
S11
K1 K2 K3 K4
14
A B
24
14
safety
input safety
input
S32
S33 24
S11
K1 K2 K3 K4
14
A B
24
14
safety
input
safety
input
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866 Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com