9
SLG440
Operating instructions
Safety light grids
EN
Calculation of the safety distance for the multi-beam light grid
S = (1600 mm/s * T) + 850mm
S = Safety distance [mm]
T = Total reaction time (machine stopping time, reaction time of the
safety guard, relays, etc)
K = Approach speed 1600 mm/s
C = Safety supplement 850 mm
Example
Reaction time of the SLG440 = 10 ms
Stopping time of the machine T = 170 ms
S = 1600 mm/s * (170 ms + 10 ms) + 850 mm
S = 1138 mm
The following mounting heights must be observed:
Number of
beams
Mounting height above reference floor
in mm
2
400, 900
3
300, 700, 1100
4
300, 600, 900, 1200
The formulae and calculation examples are related to the vertical set-up
(refer to drawing) of the safety light grid with regard to the hazardous
point Please observe the applicable harmonised EN standards and
possible applicable national regulations
The safety distance between the safety light grid and the
hazardous point must always be respected and observed If
a person reaches the hazardous point before the hazardous
movement has come to a standstill, he/she is exposed to
serious injuries
Safety distance to the hazardous area
S
Hazardous
point
Transmitter
Receiver
Command device
Authorised operation
Mechanical protection
Direction from which the
hazardous area is accessed
To calculate the minimum distances of the safety guards
with regards to the hazardous point, the EN ISO 13855 and
EN ISO 13857 must be observed
If an overlap of the protection field is possible, take care with
the calculation of the safety distance referring to additional
CRO according to the table A1 as per norm EN ISO 13855
3.5.1 Minimum distance to reflecting surfaces
During the installation, the effects of reflecting surfaces must be taken
into account In case of an incorrect installation, interruptions of the
protection field could possibly not be detected, which could lead to
serious injuries The hereafter-specified minimum distances with regard
to reflecting surfaces (metal walls, floors, ceilings or parts) must be
imperatively observed
8°
8°
a= 262 mm
Access direction
Receiver
Obstacle
optical axis
Transmitter
reflecting body
(eg Material container)
Limit of the
hazardous point
a=130mm
5°
5°
Safety distance a
a [mm]
D [m]
0
3 5
10
100
200
300
400
500
600
700
800
900
1000
15
20
Calculate the minimum distance to reflecting surfaces as a function of
the distance with an aperture angles of ± 2.5° degrees or use the value
from the table below:
Distance between transmitter and receiver
L [m]
Minimum distance
a [mm]
02 … 30
130
4
175
5
220
7
310
10
440
12
530
Formula: a = tan 2.5° x L [mm]
a = Minimum distance to reflecting surfaces
L = Distance between transmitter and receiver
