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3
Installation (continued)
Fig. 3-3: Angle of rotation
Fig. 3-4: Inclination angle
3.4
Alignment
The emitter and receiver must be installed in a way that the
light band strikes as close to the center of the receiver
window as possible. The emitter generates a light band
with a width of approx. 20 mm. The receiver window is 17 mm
wide of which 16.25 mm is the active measuring width.
When correctly aligned the light band exceeds the two
sides of the receiver window by 1 mm to 2 mm each (see
Fig. 3-5).
Use the white area of the label around the receiver window
and the black markings to align the light band precisely.
Make sure that the light band is well centered as shown in
Fig. 3-5.
Avoid improper alignments as depicted exemplarily in
Fig. 3-6.
Fig. 3-5: Correct alignment
Fig. 3-6: Light band poorly aligned: too far right; too high
3.5
Signal normalizing and autoblanking
Before using the sensor, the light intensity must be
normalized on the receiver. To do this, use the menu item
Signal normalizing [Teach].
During signal normalization, the sensor selects the
optimum sampling period.
Important:
– If the entire light band width shall be used, make sure
that nothing is in the light band during teach.
– Areas where objects are located during signal normali-
sation are blanked out and not taken into account
during subsequent operation (autoblanking).
– The blanking settings are not changed by autoblanking.
(see Chapter 4.5)
– Whether autoblanking was activated by the last teach
event is indicated in the process data (see Chapter
5.2).
If an object edge is in normal operation in the
auto-blanking area, the edge of the
autoblanking area is interpreted as an edge.
This can lead to a falsification of output values.
Edge of the Light band
Edge of the Light band
BLA 16C-002-00,25-S75
Balluff Light Array
