Shadow VI User Manual
1107200
Fixed and Floating Blanking
Chapter 3
page 69
Chapter 3 – Fixed and Floating
Blanking
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.
External fixed blanking is an option available with Shadow. With fixed blanking, you can
disable light beams in an area where a fixture penetrates the light field, and you can permit
stationery objects to protrude into Shadow's sensing field.
As an example, in a situation where a conveyor or work table extends into the light field, it
would not be feasible to move the fixture. Therefore, by installing a blanking window on the
Shadow receiver where the fixture penetrates the field, you disable the light beam that would
normally have detected the fixture. However, if penetration occurs anywhere above or below
the blanked beam, the light curtain will send a stop signal to the machinery.
The built-in floating window feature provides a means for the random bypass of only one
beam of the light curtain. It is useful in those applications where material or air ejected parts
randomly travel through or within the sensing field. The floating window may only be used
when material or parts take up a space no greater than 1
1/8
" (2.9 cm) within the sensing field.
Larger material would block more than one light beam at a time. As a result, the light curtain
would generate a stop command.
You can enable the floating window feature by turning a switch "on" inside the control. The
orange indicators at the receiver and on the cover of the control flash to let you know floating
window has been enabled. Floating window automatically alters the object sensitivity from
1
1/4
" to 2". If you use this feature, even occasionally, the safety distance for mounting must
be increased. Refer to "Calculating Safety Distance" in Chapter 2 of this manual.
Floating window can also be used in conjunction with fixed blanking. For example, you can
use both in an application where part of the tool protrudes into the light field and an air-
blow-off is ejecting parts. Instructions for installing and/or enabling both of these features
are covered in this chapter.
Содержание Shadow VI
Страница 142: ...1107200 Shadow VI User Manual page 130 Appendix C Installation of Shadow VI WPC Control Board ...
Страница 144: ...1107200 Shadow VI User Manual page 132 Appendix D Replacement Parts ...
Страница 150: ......
Страница 151: ......
Страница 152: ......
Страница 153: ......
Страница 154: ......
Страница 155: ......
Страница 156: ......
Страница 157: ......
Страница 158: ......
Страница 159: ......