2TLC010073M0201 Rev.G
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4.5
Connecting precautions
Warning!
Disconnect the power supply before attaching or removing the
connection blocks.
Make sure that connection blocks and wires are clearly marked for correct connections. Use
applicable requirements in IEC 60204‑1 for wire connections. Make sure that the wires are
fitted with crimp terminals or ferrules before connection, unless solid copper conductors are
used.
For connections of relay output contacts: Make sure that all power supplies or signal sources
are connected to one side of the safety relay and that all power consumers or signal receivers
are connected to the opposite side of the safety relay.
Make sure to use at least one of the following methods to ensure correct wire protection
against short circuits for the safety relay outputs:
• The wires are permanently connected and protected against external damage, for example
by wire ducts or other types of covers for protection.
• Use of separate multi-core wires.
• Use of cables with wires being individually shielded with earth connection.
The safety requirement is that fuses shall be used on the relay outputs.
4.6
Connection blocks
The connection blocks on the safety relay are detachable to simplify installation and
replacement. The safety relay can be ordered with two different types of connection blocks,
screw compression type or push-in type.
4.7
Coding the connection blocks
The coding kit is used to make each connection point individual to avoid faulty connection.
Place the coding parts in an specific order on the connection block and match these with the
pin header.
• The risk assessment must include the risk of mistakes when using the connection blocks
without coding.
• If coding is used, a test of the outcome of the coding against the identified risks must be
done.
