Notes On Connections; Example: Connection To The Safety Relay Se-Sr2 - Datasensing SH4 ADVANCED Product Reference Manual

Notes on connections

For the correct operation of the safety light curtains, the following precautions regard-
ing the electrical connections have to be respected:
•
•
•
•

Example: connection to the safety relay SE-SR2

24Vdc
Automatic
Restart
0Vdc
The figure shows the connection between the safety light curtains and the safety relay
of the SE-SR2 series functioning in the Automatic Restart mode (left side) and Manual
Restart with monitoring (right side).
Do not use varistors, RC circuits or LEDs in parallel at relay inputs or in series at OSSD
outputs.
•
•
•
Do not place connection cables in contact with or near high-voltage cables and/or
cable undergoing high current variations (e.g. motor power supplies, inverters,
etc.);
Do not connect the OSSD wires of different light curtains in the same multi-pole
cable.
- The TEST wire must be connected through a N.O. button to the supply volt-
age of the ESPE.
CAUTION: The TEST button must be located in such a way that the operator
can check the protected area during any test.
The RESET/RESTART/ALIGN button must be located in such a way that the
operator can check the protected area during any reset operation.
The device is already equipped with internal over-voltage and over-current sup-
pression devices.
The use of other external components is not recommended.
A1
S52
A1 13 23 33
S34
P1
S52 S34 41 42
P2
SE-SR2
POWER
CH.1
CH.2
13 23 33 41
14 24 34 42
P2
S11 S12 Y36 Y37
P1
A2 14 24 34
S12 S12
A2
Figure 22: Connection to SE-SR2 Safety Relays
The OSSD1 and OSSD2 safety contacts cannot be connected in series or in parallel,
but can be used separately, conforming to the plant's safety requirements.
If one of these configurations is erroneously used, the device enters the output
failure condition (see chapter "User Interface Dialogue").
Connect both OSSDs to the device to control.
24Vdc
OSSD1 OSSD2
Monitored
Start
0Vdc
ELECTRICAL CONNECTION
OSSD1 OSSD2
A1
S52
A1 13 23 33
S34
P1
S52 S34 41 42
P2
SE-SR2
POWER
CH.1
CH.2
13 23 33 41
14 24 34 42
P2
S11 S12 Y36 Y37
P1
A2 14 24 34
Y36/Y37
S12 S12
A2
PRODUCT REFERENCE GUIDE
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