Outputs OSSD 1 and OSSD 2 carry voltage, the RLY3-OSSD1 is switched on. When
the protective field is interrupted, the OSSD 1 and OSSD 2 outputs switch the
RLY3-OSSD1 off.
•
Fault analysis
Cross-circuits and short-circuits of the OSSDs are recognized and lead to the
locking state (lock-out). The malfunction of the RLY3-OSSD1 is detected. The
shut-down function is retained. Manipulation (e.g., jamming) of the S1 pushbutton
prevents the output current circuits from being enabled.
T-connector, RLY3-OSSD2 safety relay, with restart interlock and external device monitoring (EDM)
S
ys
tem conne
c
tion
deTec4
0 V
3) PELV
+24 V
MFP 1
OSSD 1
OSSD 2
0 V
+24 V DC
5
3
4
2
1
k2
z
k1
k2
k1
z
x
y
x
y
0 V
MFP 1
In 1
+24 V DC
In 2
5
3
2
1
4
5
3
4
2
1
5
3
4
2
1
5
3
4
2
1
E324375/00/2021-09-27
r
s
F2 F1
K2
K1
R1
Y1
Y2
24
A2
14
S1
I1
I2
23
A1
13
RLY3-OSSD2
k2
k1
2)
1)
S1
L+
L–
S
ys
tem conne
c
tion
F0
Figure 39: Connection diagram: 5-pin, T-connector, RLY3-OSSD2, with restart interlock and external device monitoring (EDM)
1)
Output circuits. These contacts must be incorporated into the control such that the
dangerous state is brought to an end if the output circuit is open. For categories 4 and
3, they must be incorporated on two channels (x, y paths). Single-channel incorporation
into the control (z path) is only possible with a single-channel control and taking the risk
analysis into account.
2)
External device monitoring is only static.
3)
SELV/PELV safety extra-low voltage.
•
Task
Connection of a deTec4 safety light curtain to a RLY3-OSSD2 safety relay. Oper‐
ating mode: With restart interlock and external device monitoring (EDM). The
T-connector establishes a connection between the sender and the receiver.
•
Mode of operation
When the protective field is clear, the OSSD 1 and OSSD 2 outputs carry voltage.
The system can be switched on when K1 and K2 are in a fault-free de-energized
position. The RLY3-OSSD2 is switched on by pressing S1 (pushbutton is pressed
PROJECT PLANNING
4
8021645/1EB0/2022-04-28 | SICK
O P E R A T I N G I N S T R U C T I O N S | deTec4
67
Subject to change without notice