Datalogic SG4 BASE - Page 12

SG4 BASE
12/73
When devices with > 40 mm resolution are used, the height of the top beam has to be ≥ 900 mm (H2) from
machine supporting base while the height of the bottom beam has to be ≤ 300 mm (H1).
If the safety light curtain must be mounted in a horizontal position (Fig 4 - page 12) the distance between the
dangerous area and the most distant optical beam must be equal to the value calculated using the following
formula:
S = 1600 mm/s (t1 + t2) + 1200 - 0,4 H
where:
S = Minimum safet
y
distance in mm.
t1 = Response time of the ESPE in seconds
(
cfr. TECHNICAL DATA pa
g
e 48
)
t2 = Machine stoppin
g
time in seconds
(
includin
g
the Safet
y
Control S
y
stem
)
H = Beam hei
g
ht from
g
round; this hei
g
ht must alwa
y
s be less than 1,000 mm.
Fig 4 - Installation distance (horizontal positioning)
Practical examples
Let's suppose to have a light curtain with height = 600 mm
To calculate the distance of the device from the ESPE, in a vertical position, the following formula is used:
S = K*T + C
where:
S = Minimum safet
y
distance in mm.
t1 = ESPE response time
t2 = Machine total stoppin
g
time
(
Includin
g
safet
y
control s
y
stem
)
.
T =
(
t1 + t2
)
Overall s
y
stem stoppin
g
performance
C = 8 *
(
R
–
14
)
for devices with resolution <= 40 mm
R = Resolution of the s
y
stem
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.
SG4-14-060-OO-E/
X
SG4-30-030-OO-E/
X
T 0.393 sec 0.394 sec
C 0 mm 128 mm
S 641.6 mm 758.4 mm
The reference standard is EN ISO 13855 “Safety of machinery - Positioning of
safeguards with respect to the approach speeds of parts of the human body”.
The following information is to be considered as indicative and concise.
For correct safet
y
distance please refer to complete standard EN ISO 13855.