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3.3.3.
Angular approach point-of-operation guarding
Country: European (EN 999)
Protection: Angular approach point-of-operation guarding (the direction of approach and the sensing plane forms an angle,
see Figure 3-5)
Application: Small mechanical or hydraulic power press
Formula: If angle α is greater than 30°, but less than 90° (30° < α < 90°), use the NORMAL APPROACH calculation. If the
angle α is less than or equal to 30° (0° < α < 30°), use the PARALLEL APPROACH calculation. In this case, the minimum
height allowed (P) is 0 mm and the maximum height allowed (H) is 1000 mm. However, if P > 300 mm, the risk of
inadvertent access from below must be taken into account.
Figure 3-5 Angular approach point-of-operation guarding
D
S
3.4.
Reflective surfaces
REFLECTIVE SURFACES
To prevent two optical paths to a receiver (located within each sensing unit), install FF-LS safety light curtains so there are
no reflective surfaces within the beam angles of the sensing units.
Failure to comply with these instructions could result in death or serious injury.
Reflective surfaces near the sensing field can cause reflection of the sensing beams and result in two optical paths to a
receiver (located within each sensing unit). This can lead to deflection and prevent detection of an object in sensing field.
The light curtain must be installed so there are no reflective surfaces within the beam angles of the sensing units. The beam
angle of the optics and the alignment tolerance for the sensing units are approximately 2° (see Figure 3-6). A minimum
distance D to the optical axis shall be observed. For a distance L between sensing units A and B, see Figure 3-6.
Figure 3-7 illustrates the minimum safety distance.
Figure 3-6 Distance from reflective surfaces
Unit B
Unit A
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107022-16 EN FR26 GLO 301 Printed in Germany
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