26
Safety distance for safeguarding danger points Section 9-1
9-1-1 Calculation example for systems with a resolution of <40 mm
Formula according to EN999: S = (K x T) + C
Where S = minimum distance in millimeters from the danger zone to the
detection point, line, plane or zone. If the result of the calcula-
tion is less than 100 mm, a distance of at least 100 mm must
still be maintained.
K = Approach speed in mm/s. In the close area of 500 mm, the
speed is calculated at 2000 mm/s. If the distance is greater
than 500 mm, K can be calculated as 1600 mm/s. In this
case, however, a minimum of 500 mm applies for the safety
distance.
T = the overall system stopping performance in seconds
T = t
1
+ t
2
+ t
3
t
1
= response time of the safety light curtain in seconds,
given in the table in chapter 16.
t
2
= response time of the safety interface t
si
, if any.
t
3
= maximum stopping time of the machine t
m
in
seconds.
Please refer to the technical information of the safety
Interface and the machine for the response time and stopping
time details.
C = 8 x (d-14 mm), but not less than zero.
d = minimum object resolution of the MS4800 system in
millimeters, therefore:
S = (2000 mm/s x T) + 8 x (d-14 mm)
This formula applies for all minimum distances of S up to and
including 500 mm. The minimum value of S shall not be less
than 100 mm.
If S is found to be greater than 500 mm using the formula
above, then the formula below can be used. In this case the
minimum value of S shall not be less than 500 mm.
S = (1600 mm/s x T) + 8 x (d-14 mm)
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