Operating Instructions
Chapter
4
miniTwin2
8013482/YT85/2016-02-23
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
23
Subject to change without notice
Mounting
Under the authority of OSHA and ANSI the minimum distance as specified by
ANSI B11.19:2003
C
04, Annex D and Code of Federal Regulations, Volume 29,
Part 1910.217 … (h) (9) (v) depends on:
stopping/run-down time of the machine or system (the stopping/run-down time is shown
in the machine documentation or must be determined by taking a measurement.)
response time of the entire protective device, e.g. miniTwin2 consisting of host and
guest (response times see 9.1 “Data sheet” on page 64)
reach or approach speed
other parameters that are stipulated by the standard depending on the application
How to calculate the minimum distance S according to EN ISO 13 855 and
EN ISO 13 857:
The following calculation shows an example calculation of the minimum distance.
Depending on the application and the ambient conditions, a different calculation may be
necessary.
First, calculate S using the following formula:
S = 2000 × T + 8 × (d – 14) [mm]
Where …
T = Stopping/run-down time of the machine
+ Response time of the protective device after light path interruption [s]
d = Resolution of the safety light curtain [mm]
S = Minimum distance [mm]
The reach/approach speed is already included in the formula.
If the result S is 500 mm, then use the determined value as the minimum distance.
If the result S is > 500 mm, then recalculate S as follows:
S = 1600 × T + 8 × (d – 14) [mm]
If the new value S is > 500 mm, then use the newly determined value as the minimum
distance.
If the new value S is 500 mm, then use 500 mm as the minimum distance.
Fig. 10: Minimum distance
from the hazardous point
Note
Hazardous
point
Distance to avoid standing behind 75 mm
Minimum distance S (D
s
)
Protective field height
