Project Engineering
42
Step 1: Calculate safety clearance
S = 1,600 mm/s × ( t
1
+ t
2
+ t
3
) + C
S = 1,600 mm/s × (0.015 s + 0.015 s + 0.3 s) + 850 mm
S = 1,378 mm
Step 2: Determine the additional clearance C
RO
.
• Find height a in table:
here: a = 1,600mm
• Find height b in table:
here: a = 1,100mm
• Take the value for C
RO
from the intersection point of the two axes:
here: C
RO
= 1,100mm
Step 3: Calculate the safety clearance S
RO
for reaching over
S = 1,600 mm/s × ( t
1
+ t
2
+ t
3
) + C
RO
S = 1,600 mm/s × (0.015 s + 0.015 s + 0.3 s) + 1,100 mm
S = 1,628 mm
5.1.4 Minimum Clearance to Reflective Surfaces
DANGER!
Risk of personal injury or property damage with reflective surfaces
within the aperture angle between the emitter and receiver!
The system’s safety function is disabled.
Personal injury and damage to equipment may occur.
• Minimum clearance (m) from reflective surfaces to the optical axis must be adhered to.
m = tan
α
× clearance from emitter to receiver
m = tan 2.5° × clearance from emitter to receiver
m
α
α
!
Danger zone
Reflective
object
Emitter
Receiver
The minimum clearance from reflective surfaces must be calculated depending on the distance between the
emitter and receiver with an aperture angle of ±2.5°.
