Chapter 5 Operating Instructions
M4000 Adv., Adv. A/P, Area
32 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8010797/PA53/27-06-05
Mounting
Example access protection with two beams:
C = 850 mm
Stopping/run-down time of the machine = 290 ms
Response time of the light path interruption = 30 ms
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 1600 × 0.32 + 850 = 1362 mm
How to calculate the safety distance D
s
according to ANSI B11.19@1990 E.4.2.3.3.5
and Code of Federal Regulations, Volume 29, Part 1910.217 … (h) (9) (v):
The 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
bm
= 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 a possible 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
pf
= 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
pf
= 0.9 m.
The applicable legal and official regulations apply to the use and mounting of the
protective device. These regulations vary depending on the application.
Calculation of the safety distance S for non-perpendicular approach
Note
Note
Fig. 17: Safety distance to
the hazardous point for non-
perpendicular approach
min
max
approach
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