Rockwell Automation 442L SC300 Safety Sensor User Manual - Manual (Page 19)

Rockwell Automation Publication 10000202762 Ver 00 - January 2012 17
Chapter 4 Mounting
Figure 9 - Safety distance from the hazardous point
Safety distance according to prEN ISO 13
855 and EN ISO 13 857
The safety distance as defined in prEN ISO 13 855 and EN ISO 13 857 depends on:
• Stopping/run-down time of the machine or system
(The stopping/run-down time is shown in the machine documentation or must be
determined by taking a measurement.)
• Response time of the entire protective device (SC300: 20 ms)
• Reach or approach speed
• Other parameters that are stipulated by the standard depending on the application
How to calculate the minimum safety distance S according to prEN ISO 13 855 and
EN ISO 13 857:
Note The following calculation shows an example calculation of the safety distance. The
calculation is based on the assumption that the approach is perpendicular to the
protective field.
Depending on the application and the ambient conditions, a different calculation may be
necessary.
Initial formula: S = K × T + 8 × (d – 14)
Where …
S = Safety distance in [mm]
Hazardous
point
Safety distance S (D
s
)
Protective field
height
All-round
reflective tape
S (D s)
Ensure the necessary safety distance
between the access point and the
hazardous point is met at all parts of the
protective field at an angle.
Note that different rules may apply to
the calculation of the safety distance
for protective fields at an angle.
Your Rockwell Automation
distributor/sales office will be pleased
to assist you with the implementation
of special applications.
If the protective field is at an angle, pay special attention to the
safety distance.
ATTENTION