Table of Contents
Advertisement
To safeguard the danger point, a safety distance S must be observed between the
detection zone of the laser scanner and the danger zone. The SIMATIC FS660I Laser
Scanner can fulfil its protective function only if it has been installed and positioned in
such a way as to allow for an adequate safety distance. The safety distance ensures that
no body part whatever can reach the danger point until the hazardous movement of the
machine has come to a complete standstill.
The safety distance S when safeguarding a danger point may be calculated, based on
EN 999, by means of the following formula:
S = K x T + C
S
=
Safety distance in mm
K
=
Approach velocity in mm/s
At a close distance of 500 mm, a velocity of 2000 mm/s should be
assumed. If the calculation involves a distance in excess of 500 mm, K may
be taken to be 1600 mm/s. But in this case the safety distance is subject to
a minimum value of 500 mm.
T
=
Overall time of delay in seconds,
a total consisting of:
Response time of the laser scanner
Overtravel time of the machine including
the controls
C
=
8 x (d-14) in mm
Added margin dependent on the depth of penetration of the detection zone,
based on the resolution of the laser scanner: C(30mm) = 128 mm,
C(40mm) = 208 mm
d
=
The resolution to which the laser scanner
has been set
In this connection please also have regard to the illustrations given in this chapter.
50
Adjustable, max. 200 ms
Based on measurement of
overtravel time
Here = 30 mm or 40 mm
Advertisement
Table of Contents
