107062-12 EN FR26 GLO 501 Printed in France 33
IMPROPER POINT-OF-OPERATION PROTECTION
Install the FF-SB Light Curtains and mechanical guards so that NO person can stand between the light
curtain and the danger zone without being detected.
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.
Sample Calculation (Point-of-operation guarding)
Country: USA
Application: Mechanical or hydraulic power press
Protection: Point-of-operation guarding
Formula: D
S
>V(t
1
+t
2
)+C
− V = 63 in/sec.
− t
1
= 30 ms (FF-SB14E/R14K-S2)
− t
2
= 200 ms (machine stop time; including response time of all interconnecting components, such as relays,
solenoids, brakes, etc.)
− C = 3.8 in. (ANSI B11.1 and ANSI B11.2) [FF-SB14]
− D
S
= 63 (0.030 + 0.200) + 3.8 in. = 18.29 in.
IMPROPER PERIMETER PROTECTION
• Design control circuit to require a manual restart before further machine operation can occur.
• Locate manual restart to allow operator a clear view of danger zone.
• Operator should NOT be able to reach manual restart from within danger zone.
• Design control circuit to prevent Programmable Logic Controller from overriding manual restart.
Failure to comply with these instructions could result in death or serious injury.
Sample Calculation (Perimeter guarding)
Country: USA
Application: Robotics
Protection: Perimeter guarding
Formula: D
S
>V(t
1
+t
2
)+C
− V = 63 in./sec.
− t
1
= 26 ms (FF-SB15E/R10K-S2)
− t
2
= 200 ms (robotics stop time, including response time of all interconnecting components, such as relays,
solenoids, brakes, etc.)
− C = 33.5 in. (USA)
− D
S
= 63 (0.026 + 0.200) + 33.5 = 47.74 in.
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