The distance to the opening should be a maximum of 200 mm on each side,
unless otherwise determined in the risk assessment.
If needed the operating entity of the machine must take additional security mea‐
sures, such as mounting electronically monitored swinging flaps.
The type 4 electro-sensitive protective device must only be mounted with the original
accessories of the manufacturer and connected according to the instructions of the
manufacturer. For more notes, see the operating instructions for the Type 4 electro-sen‐
sitive protective device.
4.4.2
Minimum distance between the Type 4 electro-sensitive protective device and the hazardous point
Calculation of minimum distance
The minimum distance between the Type 4 electro-sensitive protective device and the
hazardous point is calculated in accordance with EN ISO 13855 as follows:
S = K × T + C + Z
S= K × T + C +700 mm
Formula symbols
Description
S
Minimum distance
K
Approach speed
T
Overall system stopping time
C
Penetration distance
Z
Application-specific supplement
The application-specific supplement is 700 mm. This supplement
is made up of 500 mm for differentiating between people and
materials and 200 mm of monitored conveying distance that is
usually the result of the delay time T
Clearance
. If a conveying dis‐
tance other than 200 mm is configured, the application-specific
supplement must be adapted accordingly.
The risk assessment must determine to what degree people can misuse a process sig‐
nal intended for transport goods in order to activate the muting function themselves (by
interrupting the Type 4 electro-sensitive protective device). This possibility must be
taken into account in particular with transport goods which can be taken off the con‐
veyor by hand.
A person who activates the muting function will be detected at the latest because the
muting period is too short. However, the person is already in the hazardous area at this
point.
The application-specific supplement Z is not needed if the risk assessment concludes
that it is not possible for people to be on the conveyor or AGV/AGC.
4.4.3
Design of the material opening
The material transportation opening should be designed so as to provide free space of
maximum 200 mm next to the material when the material is passing through. If the risk
assessment concludes that even with a larger free space it is still impossible for per‐
sons to end up in the hazardous area by passing next to the material, the free space
can be adjusted accordingly.
If the free space next to the material is larger than 200 mm, it should be at least
500 mm to prevent the crushing of persons between the material and the Type 4 elec‐
tro-sensitive protective device or other machine parts. In this case, additional protective
measures must be taken, e.g., installation of electrically monitored swing doors.
4
PROJECT PLANNING
18
O P E R A T I N G I N S T R U C T I O N S | Safe Entry Exit
8021675/ZV26/2019-05-13 | SICK
Subject to change without notice
