107031-33-EN FR26 GLO 1101 Printed in France
15
IMPROPER PERIMETER PROTECTION
•
Design control circuit to allow a manual restart before further machine operation can occur.
•
Locate manual restart outside of danger zone where operator has a clear view of 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.
Honeywell's FF-SYA234 multibeam systems and the FF-SYA60 are self-contained, perimeter protection devices designed to
detect the body of an operator before gaining access to a dangerous area. After the detection of a body, the machine must stop
and remain stopped until the operator performs a manual restart outside the danger zone.
3.4
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.
3.4.1
Safety distances per Europe’s EN 999 standard
In Europe, calculate the safety distance (see Figure 3-1) using the following formula:
S
≥≥≥≥
V (t
1
+ t
2
) +C
Where:
•
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
1
is the response time of the FF-SYA light curtain.
•
t
2
is the stopping time of the equipment guarded by the light curtain including interconnecting components such as all
mechanical, electromechanical, and electronic parts such as relays, solenoids, and brakes.
•
C is additional safety distance.
3.4.2
Safety distances per USA’s OSHA/ANSI requirements
In the USA, calculate the safety distance (see Figure 3-1) using the following formula:
Ds
≥≥≥≥
K (Ts+Tc+Tr) + Dpf
Where:
•
Ds is the minimum safety distance from the light curtain sensing field to the danger zone
•
K is the approach speed of movement to the danger zone
•
Ts is the worst case stopping time of the machine
•
Tc is the worst case response time of the machine’s control
•
Tr is the response time of the safety devices (light curtain plus its interface – meaning the response time including the
mechanical relay outputs)
•
Dpf: Depth penetration factor
Figure 3-1 Light Curtain Safety Distance Diagram
HAZARD
Emitter
Receiver
Infrared light beam
Beam optical axis
F
SYA1
2
