WCS* Read Head Position Encoding System
Data Cables and Mounting/Dismounting the Read Head
2020-01
13
3 Data Cables and Mounting/Dismounting the Read Head
3.1 Data cable
A shielded data cable with twisted-pair wires is used for the electrical connection. Pepperl and
Fuchs can supply suitable preassembled M12 single-ended female cordsets (see chapter
12.1) or field-attachable M12 single-ended female cordsets and data cables.
Data cable WCS-DC*
There are 2 types of data cable available:
• WCS-DCS for stationary cable routing
• WCS-DCF for trailing cable and drag chain installations.
The data cables are twisted pairs and have a tinned copper braided shield. The braided shield
surrounds all wire pairs. The parameters of the data cables that are suitable for RS-485, SSI,
and CANopen data transfer are listed in the table below.
Cable routing
The basic prerequisite for uninterrupted data transfer is that the data cables are routed in such
a way that any coupling of electromagnetic fields and interference is excluded. For EMC-com-
pliant cable routing, it is necessary to divide the cables into cable groups and route these
groups separately.
Group A
• Shielded data cable (including analog)
• Unshielded cable for DC and AC voltages 0 ... 60 V
• Shielded cable for DC and AC voltages 0 ... 230 V
• Coaxial cables for monitors
Group B
• Unshielded cable for DC and AC voltages 60 ... 400 V
Group C
• Unshielded cable for DC and AC voltages greater than 400 V
Shielding cables
The shielding of cables is required to suppress electromagnetic interference. Establishing a
low resistance or low impedance connection with the protective conductor is a particularly
important factor in ensuring that these interference currents do not become a source of interfer-
ence themselves.
The WCSB2B and WCS3B read heads have no connection option for the cable shield. The
cable shield is connected to the plant potential in the switch cabinet with low resistance (large
area). In the case of high electromagnetic interference, it is advisable to connect the shield of
the data cable to the plant potential in the immediate vicinity of the read head with low resis-
tance using a grounding clip.
WCS-DCS WCS-DCF
Capacitance (core-core) 120 pF/m 60 pF/m
Cross section
0.14 mm
2
0.25 mm
2
Number of wires 6 (3 x 2) 6 (3 x 2)
External diameter 5.8 mm 7.5 mm
Temperature range -40 ... 80 °C -40 ... 70 °C
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