Datalogic SG2 BASE Series - Page 14

SG2 BASE
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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 safety distance in mm.
t1
=
ESPE response time
t2
=
Machine total stopping time (Including safety control system).
T
=
(t1 + t2) Overall system stopping performance
C
=
8 * (R – 14) for devices with resolution <= 40 mm
R
=
Resolution of the system
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
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 * (R – 50)
R
=
Resolution of the device
SG2-30-060
SG2-50-060
SG2-90-060
-
-
0.3 sec
0.391 sec
H
-
0 mm
600 mm
S
-
1828.8 mm
1585.6 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 safety distance please refer to complete standard EN ISO 13855.
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