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WCS position encoding system
Readers
5
Readers
The reader housing is made from a robust plastic and has IP54 protection. The product
contents include the mounting bracket for mounting the reader. On the inside of the reader
there are easily removable, transparent plastic lenses that protect the reading area against dirt
and damage. Identification notches can be found on these lenses. The notches are used for
adjustment of the zero point for the vertical play of the reader (= Z-axis).
14. The reference point is the top edge of the code rail. Within specified tolerances, the reader
may move around this reference point: if the vertical play on the Z-axis is exceeded, the reader
reports "OUT" to the controller (reader outside the code rail). The tolerances for the lateral play
on the Y-axis result from the gap width of the reader. The positions are reliably determined up
to a minimum of 500 mm for both an inclined position in the vertical direction and in the
horizontal direction, as well as in curves. If the position value cannot be determined, for
example due to contamination of the optical system, the reader reports a unique error code.
From a technological point of view, the WCS2B and WCS3B readers are very similar. The
resolution and the signals to the interface are almost identical. However, there are differences
in the mechanical systems and in the accessories.
Resolution
v
max
WCS2B
WCS2B readers have a gap width of only 10 mm. This close proximity between the emitter and
receiver provides high contaminate burn-through power. This makes the WCS2B reader
suitable for very dirty environments such as galvanizing plants, foundries, and steel mills. An
optional guide trolley and the WCS2B rail system are specially designed for operation with
imprecise mechanical connections and where vibrations occur, for example, with automatic
cranes.
Figure 5.1
WCS3B
WCS3B readers have a gap width of 31 mm. This results in a greater tolerance when mounting
the reader and aligning it in relation to the code rail. WCS3B systems are ideal for monitoring
conveyor belts and automated warehouse and lifting systems.
Special features of the WCS3B readers include the status LEDs for the alignment and
performance display, an optional "overspeed" output, and an optional 7-segment display for
position and diagnostic data.
WCS2B
± 0.42 mm
1200 pos./m
12.5 m/s
75
10
WCS2B dimensional drawing
WCS3B
± 0.40 mm
1250 pos./m
12.5 m/s
129
115
M12 x 1
see image on page
13
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