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3.3.2.
Parallel approach point-of-operation guarding
IMPROPER POINT-OF-OPERATION PROTECTION
Install the FF-LS safety light curtains and mechanical guards so that NO person can stand or reach between the light curtain
and the danger zone without being detected.
Failure to comply with these instructions will result in death or serious injury.
If the direction of approach is parallel to the plane of detection (e.g. if the safety light curtain is horizontally mounted, see
Figure 3-4), the minimum safety distance D
curtain above the ground.
Figure 3-4 Parallel approach point-of-operation guarding
3.3.2.1. European safety distance calculation
Calculate the safety distance D
If 875 < H ≤ 1000, then D
or
If 0 < H ≤ 875, then D
The height H should be a maximum of 1000 mm from the ground. However, if the installation height H is greater than
300 mm, there is a risk of inadvertent undetected access beneath the safety light curtain. Install additional protective safety
devices as required. Example: if H = 300 mm, then D
Country: European (EN 999)
Protection: Parallel approach point-of-operation guarding using a FF-LS14 safety light curtain (14 mm minimum object
detection)
Application: Small mechanical or hydraulic power press
Formula: D
> 1600 (t
+t
) + (1200 – 0,4H) (mm) where (1200 – 0,4H) > 850 mm
S
1
2
If H is greater than 300 mm (11.82 in), there is a risk of access from under the safety light curtain. For this safety light
curtain, the minimum height allowed is H min. = 0 mm. The maximum height allowed is H max. = 1000 mm (39.37 in).
D
is the safety distance from the light curtain sensing field to the danger zone.
S
V is the velocity of movement into the danger zone (1600 mm/s).
t
is the response time of the FF-LS light curtain (50 ms).
1
t
is the stopping time of the equipment guarded by the light curtain including interconnecting components such as all
2
mechanical, electromechanical, and electronic parts such as relays, solenoids, and brakes.
H is the height of the detection plane (250 mm)
For example, if:
V = 1600 mm/s
t
= 50 ms = 0,050 s
1
t
= 150 ms = 0,150 s
2
H = 250 mm, then:
D
= 1600 (0,050 + 0,150) + (1200 – 0,4[250]) = 1420 mm
S
107022-16 EN FR26 GLO 301 Printed in Germany
from the danger zone to the outer beam depends on the height (H) of the light
S
D
S
using the formula below:
S
≥ 1600 mm(t
+ t
) + 850, t in s
S
1
2
≥ 1600 mm(t
+ t
) + (1200 – 0,4 H), t in sec, H in mm
S
1
2
= 1.6 (t
S
+ t
) + 1080.
1
2
18
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