NOTES ON CONNECTIONS
INSTRUCTION MANUAL 27
NOTES ON CONNECTIONS
For the correct operation of the safety light curtains, the following precautions regard-
ing the electrical connections have to be respected:
• 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 ligh
t curtains in the same multi-pole
cable.
- The TEST wire must be connected through a N.O. button to the supply voltage
of the E
SPE.
• The device is already equipped with internal overvoltage and overcurrent suppres-
sion devices.
• The use of other external components is not recommended.
Example: connection to the safety relay SE-SR2
Figure 6 - Connection to SE-SR2 Safety Relays
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 outpu
ts.
• The OSSD1 and OSSD2 safety contacts cannot be c
onnected in series or in parallel,
but can be used separately, conforming to the plant’s safety requirements.
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.
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