Proper Line Connection; Shielding And Potential Separation - Beckhoff ELX3351 Operating Manual

Up to eight terminal points enable the connection of solid or finely stranded cables to the Bus Terminal. The
terminal points are implemented in spring force technology. Connect the cables as follows:
1. Open a terminal point by pushing a screwdriver straight against the stop into the square opening
above the terminal point. Do not turn the screwdriver or move it alternately (don't toggle).
2. The wire can now be inserted into the round terminal opening without any force.
3. The terminal point closes automatically when the pressure is released, holding the wire securely and
permanently.
Observe the requirements for connecting cables and cross sections according to IEC 60079-7 and IEC
60079-11. See the following tables for the suitable wire size width.
Power supply terminal
Wire size width (single core wires)
Wire size width (fine-wire conductors)
Wire size width (conductors with a wire end sleeve)
Wire stripping length
Maximum screwdriver width for ELX9560
Use a screwdriver with a maximum width of 2 mm to wire the ELX9560 power supply termi-
nal. Wider screwdrivers can damage the terminal points.
Attention
All other ELX terminals
Wire size width (single core wires)
Wire size width (fine-wire conductors)
Wire size width (conductors with a wire end sleeve)
Wire stripping length
3.6.3

Proper line connection

Always connect only one wire per terminal point.
When using fine-wire conductors it is recommended to connect them with wire end sleeves in order to
establish a safe, conductive connection.
In addition, make sure that the pin assignment is correct to prevent damage to the ELX terminals and the
connected devices.
3.6.4

Shielding and potential separation

Shielding
Encoder, analog sensors and actors should always be connected with shielded, twisted
paired wires.
Note
Observe installation requirements in areas of potentially explosive atmos-
pheres!
During installation, observe the requirements for cables, shielding and earth potential
CAUTION
equalization in areas of potentially explosive atmospheres according to IEC 60079-11,
IEC 60079-14 and IEC 60079-25.
Ensure potential separation of the 24 V Ex busbar!
In any case, make sure that the galvanic isolation made by the ELX9560 between the 24 V
Ex busbar (power contacts +24 V Ex and 0 V Ex) and other system potentials (if applicable
WARNING
also functional or protective earths) is not removed.
ELX3351
ELX9560
0.14 ... 1.5 mm
0.14 ... 1.5 mm
0.14 ... 1.0 mm
8 ... 9 mm
ELXxxxx
0.08 ... 2.5 mm
0.08 ... 2.5 mm
0.14 ... 1.5 mm
8 ... 9 mm
Version: 1.3.1
Mounting and wiring
2
2
2
2
2
2
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