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INSTALLATION
Minimum installation distance
The safety device must be positioned at a specific safety distance (Operating distance).
This distance must ensure that the dangerous area cannot be reached before the dan-
gerous motion of the machine has been stopped by the Safety Control System.
The safety distance depends on 4 factors, according to the EN ISO 13855 Standard:
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The following formula is used for the calculation of the safety distance:
where:
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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).
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SH4 ADVANCED
Response time of the ESPE (the time between the effective beam interruption and
the opening of the OSSD contacts)
Machine stopping time including Safety Control System computing and actuating
time if present.
ESPE resolution
Approaching speed of the object to be detected
Figure 4: Installation distance (vertical positioning)
S = Minimum safety distance in mm
K = Speed of the object, limb or body approaching the dangerous area in mm/s
t1 = Response time of the ESPE in seconds (see appendix "Technical Data".)
t2 = Machine stopping time in seconds (including the Safety Control System)
C = Additional distance based on the possibility to insert the body or one of the
body parts inside the dangerous area before the protective device trips.
C = 8 (R - 14) for devices with resolution ≤ 40 mm
C = 850 mm for devices with resolution > 40 mm
R = Resolution of the system
NOTE: K value is:
2000 mm/s if the calculated value of S is ≤ 500 mm
1600 mm/s if the calculated value of S is > 500 mm
S = K (t1 + t2) + C
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