When the light path is clear, the OSSD1 and OSSD2 outputs carry voltage. The sys‐
tem can be switched on when K1 and K2 are in a fault-free de-energized position.
Lamp H2 flashes. The RLY3-OSSD2 is switched on by pressing S1 (pushbutton is
pressed and released). The outputs (contacts 13-14 and 23-24) switch the K1
and K2 contactors on. When the light path is interrupted, the OSSD1 and OSSD2
outputs switch the RLY3-OSSD2 off. Contactors K1 and K2 are switched off.
•
Muting and override
Muting starts when the light path is clear and valid muting input conditions apply.
Muting lamp H1 signals the muting status. If a fault occurs when the light path is
interrupted and at least one muting sensor is active, the protective device must be
in the override status. Pressing key-operated pushbutton S2 (pressing and releas‐
ing) initiates the override status.
Muting, ER12 and RLY3-OSSD2 safety relay
E270308/01/2020-05-07
S
ys
tem connec
tion
Muting sensor
connection A
Muting sensor
connection B
RES/OVR
connection
+24 V DC
deTem4 LT AP
2
1
3
5
6
4
7
8
In3
ADO
OSSD1
OSSD2
In4
0 V DC
Code 1
F2
F1
+24 V DC
L +
L –
0 V DC
K2
K1
R1
Y1
Y2
24
A2
14
S1
I1
I2
23
A1
13
RLY3-OSSD2
k2
z
k1
k2
k1
z
x
y
x
1)
y
2) PELV
F0
Muting
sensor pair B
Muting
sensor pair A
C1 Muting
enable
ER12
H1
RES/OVR
Q
+
-
k2
k1
Figure 24: Connection diagram: common operating device (ER12) for restart interlock and over‐
ride, and external device monitoring on the RLY3-OSSD2
1)
Output circuits: These contacts must be incorporated into the control such that the dan‐
gerous state is brought to an end if the output circuit is open. For categories 4 and 3, they
must be incorporated on dual-channels (x, y paths). Type 2 devices are suitable for use up
to PL c. Single-channel incorporation into the control (z path) is only possible with a single-
channel control and taking the risk analysis into account.
2)
SELV/PELV safety extra-low voltage.
•
Task
Connection of a multiple light beam safety device deTem4 LT Muting A/P to a
RLY3-OSSD2 safety relay. Muting: entry/exit monitoring and C1 muting release
supplementary signal (photoelectric retro-reflective sensor dark switching). Operat‐
ing mode: with restart interlock/override implemented on the ER12, and external
device monitoring in the RLY3-OSSD2.
•
Mode of operation
PROJECT PLANNING
4
8024802/2020-07-17 | SICK
O P E R A T I N G I N S T R U C T I O N S | deTem4 LT Muting A/P
39
Subject to change without notice