Wenglor SEMG412, Operating Instructions Manual

Page: 25 / 75

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5.4 Safety Clearance
EN ISO 13855 + EN ISO 13857
[
abc
]
• Safety clearance is the minimum distance between the safety field of the ESPE and the danger zone.
• Safety clearance must be adhered to, in order to assure that the danger zone cannot be reached before
hazardous motion is fully stopped.
S = (K × T ) + C
RT
bzw. S = K × (t
1
+ t
2
) + C
RT
S [mm] = safety clearance measured from the danger zone to the safety field
K [mm/s] = approach speed
T [s] = total response time (t
1
+ t
2
)
t
1
[s] = ESPE response time
t
2
[s] = machine or process overtravel time (overtravel time is specified in the machine’s documenta-
tion, or must be ascertained by means of measurement)
C
RT
[mm] = additional clearance depending upon resolution d with reference to reaching through the
ESPE
C
RO
[mm] = additional clearance with reference to reaching over an ESPE
d [mm] = resolution of the ESPE
H [mm] = reference height, height of the safety field above the floor
a [mm] = height of the danger zone
b [mm] = height of the top edge of the safety field
5.4.1 Safety Clearance for Vertical Approach to the Safety Field
S
H
a
C
RO
K×T
b
Danger Zone Boundary
Observe reference height H.
H
≤ 300 mm

avoid danger of undetected access underneath the safety field.
H < 200 mm

avoid danger of undetected access by children underneath the safety field.
Height of the uppermost beam ≥ 900 mm

prevent danger of stepping over the safety field.