Chapter 4 Operating Instructions
WSU/WEU263
16 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8013338/YTA4/2016-03-24
Subject to change without notice
Mounting
How to calculate the safety distance D
S
according to ANSI B11.19 (Annex D)
E.4.2.3.3.5 and Code of Federal Regulations, Volume 29, Part 1910.217 … (h) (9) (v):
T
he following calculation shows an example calculation of the safety distance. Depending
on the application and the ambient conditions, a different calculation may be necessary.
First, calculate D
s
using the following formula:
D
S
= H
S
× (T
S
+ T
C
+ T
r
+ T
bm
) + D
pf
Where ...
D
S
= The minimum distance in inches (or millimetres) from the hazardous point to the
protective device
H
S
= A parameter in inches/second or millimetres/second, derived from data on
approach speeds of the body or parts of the body. Often 63 inches/second is
used for H
S
.
T
S
= Stopping/run down time of the machine tool measured at the final control
element
T
C
= Stopping/run-down time of the control system
T
r
= Response time of the entire protective device after light path interruption
T
b
m
= Additional response time allowed for brake monitor to compensate for wear
Any additional response times must be accounted for in this calculation.
D
pf
= An additional distance added to the overall safety distance required. This value is
based on intrusion toward the hazardous point prior to actuation of the electro-
sensitive protective equipment (ESPE). For applications that can be reached over,
the value D
p
f
= 1.2 m. For beam arrangements that permit reaching in with the
arms or the detectable object size is greater than 63 mm, the value D
p
f
= 0.9 m.
Maintain the safety distance!
The WSU/WEU26@3 devices are to be fitted such that when the light beam is interrupted,
the hazardous point is only reached when the dangerous state is no longer present.
Risk of failure to detect!
Persons who are in the hazardous area but not in the light path between sender and
receiver are not detected by the WSU/WEU26@3 devices. It is therefore to be ensured that
the hazardous area is fully visible and any dangerous state can only be initiated if there
are no personnel in the hazardous area.
The WSU/WEU26@3 devices are not allowed to be used for hand and finger protection.
The applicable legal and official regulations apply to the use and mounting of the
protective device. These regulations vary depending on the application.
Note
Note
WARNING
WARNING
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