SICK L 4000 Manual De Instrucciones página 320

Chapter 4
Note
Note
WARNING
296
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
Installation and mounting
Response time from interruption of the light path = 30 ms
Approach speed of personnel = 1.6 m/s
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 1600 x 0.32 + 850 = 1362 mm
How to calculate the safety distance D
B11.19-1990 E.4.2.3.3.5 and Code of Federal Regulations, Vol-
ume 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
D = H x (T + T
s s s
Where ...
D = The minimum distance in inches (or millimetres) from the
s
hazardous point to the protective device
H = A parameter in inches/second or millimetres/second, de-
s
rived from data on approach speeds of the body or parts of
the body.
Often 63 inches/second is used for H
T = Stopping/run-down time of the machine tool measured at
s
the final control element
T = Response time of the control system
c
T = Response time of the presence-sensing device and its in-
r
terface
T = Additional response time allowed for brake monitor to com-
bm
pensate for wear
Any additional response times must be accounted for in this calcula-
tion.
D = An additional distance added to the overall safety distance
pf
required. This value is based on intrusion toward the hazar-
dous point prior to actuation of the electro-sensitive protec-
tive equipment (ESPE). The value for applications where
reaching over is possible is D
rangements that allow reaching in with the arm, or the de-
tectable object size is greater than 63 mm, D
Observe safety distance!
The L 4000 system is to be mounted such that on the interruption of
the light beam, the hazardous point is only reached when the danger-
ous state of the machine has been halted.
using the following formula:
s
+ T + T ) + D
c r bm pf
Operating Instructions
L 4000 system
according to ANSI
s
.
s
= 1.2 m and for beam ar-
pf
= 0.9 m.
pf
8010009/TI69/2009-11-26