107063-11 EN FR26 GLO 800 Printed in France
17
How to Calculate Safety Distance
IMPROPER SAFETY DISTANCE
•
Calculate safety distance using formula D
S
>V(t
1
+t
2
)+C where,
−
D
S
is the safety distance (OSHA 29 CFR 1910.217)
−
V is the hand speed constant of 63 inches per second
−
t
1
is the response time of the FF-SPS4 perimeter guarding system
−
t
2
is the stopping time of the machine including interconnecting components such as relays,
solenoids, and brakes
−
C is additional safety distance obtained from local safety agency.
•
Position the FF-SPS4 perimeter guarding system at the proper distance to allow a machine
to arrive at a complete stop before an operator reaches a danger zone.
Failure to comply with these instructions could result in death or serious injury.
The safety distance is the minimum distance between the sensing field and the danger zone.
This distance ensures that the danger zone cannot be reached until the machine motion has
been stopped.
Calculate the safety distance (see figure 2-1) using the following formula:
D
S
>V
×
(t
1
+t
2
)+C, where
−
D
S
is the safety distance from the safety perimeter device sensing field to the danger zone.
−
V is the velocity of movement into the danger zone; the OSHA hand speed constant is 63
inches per second; see health and safety regulations for current value.
−
t
1
is the response time of the FF-SPS4 safety perimeter device (20 ms).
−
t
2
is the stopping time of the equipment guarded by the safety perimeter device including
interconnecting components such as all mechanical, electromechanical, and electronic parts
such as relays, solenoids, and brakes.
−
C is additional safety distance. See health and safety regulations for this value.
Figure 2-1 Perimeter Guarding System Safety Distance Diagram
D
S
IMPROPER FF-SPS4 SERIES APPLICATION
•
A minimum of two beams are required to properly apply the FF-SPS4 Series safety
perimeter guarding devices.
•
Entry into the protected area must be allowed only by interruption of the sensing beams.
Failure to comply with these instructions could result in death or serious injury.
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
