Wintriss Shadow VI, Руководство пользователя

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1107200 Shadow VI User Manual
page 70 Chapter 3 Fixed and Floating Blanking
Blanking Windows Affect Safety Distance
DANGER
!
INCORRECT SAFETY DISTANCE
Ensure that the correct safety distance exists between the light curtain and the hazardous
area. See Chapter 2 for detailed information on object sensitivity, depth penetration factor
and calculating the safety distance.
Failure to comply with these instructions will result in death or serious injury.
DANGER
!
UNPROTECTED ZONE DUE TO EXTRA BLANKING WINDOWS
•
DO NOT blank more than two beams of the light curtain unless a conveyor or other object
completely fills the blanked area, or if you use barrier guards to block any unfilled areas.
•
Remove blanking windows when they are no longer needed.
•
Maintain access to blanking master and slave windows under supervisory control to avoid
unauthorized usage.
Failure to comply with these instructions will result in death or serious injury.
IMPORTANT
Refer to Chapter 2 in this manual for more information on safety distance, object sensitivity,
and depth penetration factor.
If you use a blanking window or floating blanking window, safety distance is affected,
because the sensitivity
of the light curtain is altered. The minimum size that Shadow can
sense is an object 1
1/4
" (3.2 cm) in diameter. This diameter, called the object sensitivity of
the light curtain, is the smallest diameter object that Shadow will detect anywhere in its field.
Anything smaller might fit between two light beams.
You must also consider the depth penetration factor (D
pf
) which is 3.3" (8.4 cm) for an
unblanked Shadow. This factor represents how far an object, such as an operator's hand, can
move through the light path before the light curtain reacts. Depth penetration factor and
object sensitivity are interrelated.
A blanking window blocks one light beam, creating an additional
3/4
" (1.9 cm) passageway
through the light field where no object will be detected. Now the object sensitivity equals 2"
(5.08 cm) wide (1
1/4
"+
3/4
") and the depth penetration factor is 5.9" (15 cm).
The ANSI safety distance formula stipulates that if object sensitivity increases, the safety
distance must also be increased. This means that using fixed or floating blanking will require
moving the light curtain farther back from the hazardous area.