Operating Instructions Chapter 4
C 4000
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Installation and mounting
How to calculate the safety distance S according to OSHA § 1910.217 and
ANSI/RIA R 15.06:
> Calculate S using the following formula:
S=63×T [in.] (1inch = 25.4mm)
T = stopping/run-down time of the machine
+ response time of the protective device [s]
S = safety distance [in.]
The reach/approach speed is already included in the formula.
Example:
Stopping/run-down time of the machine = 290 ms
Response time = 30 ms
Resolution of the light curtain = 14 mm
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 63 × 0.32 = 20.16 in.
4.1.2 Minimum distance from reflecting surfaces
The light beams from the sender may be deflected by reflecting surfaces. This can result in
failure to identify an object.
All reflecting surfaces and objects (e.g. material bins) must therefore be located at a mini-
mum distance a from the protective field of the system. The minimum distance a depends
on the distance D between sender and receiver.
Fig. 16: Minimum distance
from reflecting surfaces
This is how you determine the minimum distance from the reflecting surfaces:
> Determine the distance D [m] sender - receiver
> Read the minimum distance a [mm] from the diagram:
Distance D sender - receiver
Minimum distance a
Reflecting surface
Fig. 17: Diagram, minimum
distance from reflecting
urfaces
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