Honeywell SYA14 Series Manual page 28

3.2 Point-of-operation Guarding
IMPROPER POINT-OF-OPERATION INSTALLATION.
• DO NOT allow an operator to stand undetected between the light curtain and the
machine when using FF-SYA Series safety light curtains for point-of-operation
guarding.
Failure to comply with these instructions will result in death or serious injury.
Point-of-operation is defined as that area where a machine performs work (such as
cutting, shaping, boring, or forming) on a material. For point-of-operation guarding the
safety light curtain(s) and any mechanical guards must be installed so no one can stand
undetected between the light curtain and the dangerous machine zone. Additional hard
guarding, or light curtains may be required.
3.3 How to Calculate Safety Distance
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 3-1) using the following formula:
S >V(t +t )+C where,
1 2
− S is the safety distance from the light curtain sensing field to the danger zone
− V is the velocity of movement into the danger zone
− t
is the response time of the FF-SYA light curtain.
1
− t
is the stopping time of the equipment guarded by the light curtain including
2
interconnecting components such as all mechanical, electromechanical, and electronic
parts such as relays, solenoids, and brakes.
− C is additional safety distance.
Figure 3-1 Light Curtain Safety Distance Diagram
HAZARD
HAZARD
Infrared light beam
Emitter
Beam optical axis beam optical axis
28
R
Receiver
107031-23 EN FR26 GLO 1199 Printed in France