Instruction Manual
SG2 EXTENDED
7
Practical examples:
Let's suppose to have a light curtain with height = 600 mm
1) To calculate the distance of the device from the ESPE, in a vertical position, the following formula is
used:
S = K*T + C
where:
T = t1 + t2
t
1
= ESPE response time + SE-SR2 relay release time (max 80 ms)
t
2
= Machine total stopping time
d = Resolution of the device
C = 8 * (d – 14) for devices with resolution <= 40 mm
C = 850 for devices with resolution > 40 mm
In all cases, if K = 2000mm/sec then S will be > 500 mm. Distance will have then to be recalculated
using K = 1600 mm/sec.
SG2-30-060
SG2-50-060
SG2-90-060
T
0.398 sec
0.393 sec
0.391 sec
C
128 mm
850 mm
850 mm
S
764.8 mm
1478.8 mm
1475.6 mm
2) To calculate the distance of the device from the ESPE, in a horizontal position, the following formula
is used:
S = 1600 * T + 1200 – 0.4 * H
where:
H = Beam min. height from ground 15 * (d – 50)
d = Resolution of the device
SG2-50-060
SG2-90-060
T
-
0.3 sec
0.391 sec
H
-
0 mm
600 mm
S
-
1828.8 mm
1585.6 mm
WARNING
: the reference standard is EN-999 “Machine safety - the positioning of the protective
device based on the approaching speed of the human body”.
This information is just an indication and a kind of summary.
For safety distance correct calculation, it is compulsory to refer to the whole EN-999 standard.
