1139300
Shadow 8 User Manual
3-4
Operation
Programming a Fixed Blanking Window
Shadow 8 allows you to program an area within the sensing field into which a stationary
fixture may protrude without triggering a Curtains Unobstructed state and stopping the
guarded machine. This programmed area, which is created by disabling the beams that
normally protect it, is called a fixed blanking window. Fixed blanking windows may span any
number of beams, but at least 7 to 9 contiguous beams on Main heads and at least 2
contiguous beams on Extensions must remain unprogrammed.
When using fixed blanking, make sure that all unobstructed areas of the blanking window are
protected by supplemental guarding so that the operator has no access to the pinch point
through the blanked beams (see Figure 3-1, page 3-5).
OBSERVE CORRECT SAFETY DISTANCE WHEN USING BLANKING WINDOWS
• Ensure that the correct safety distance exists between the light curtain and the hazardous area.
See Calculating the Safety Distance, page 2-2 for detailed information on object sensitivity,
depth penetration factor, and OSHA and ANSI safety distance formulas.
• Add 5.38 in. (136.6 mm) to the calculated safety distance for a one-beam fixed blanking
window; add 2.69 in. (68.3 mm) for a one-beam floating window (see Increasing Safety Distance
To Compensate for Blanking Windows, page 2-10).
• When more than one beam is programmed as a fixed blanking window, and the blanked area is
not completely obstructed, the depth penetration factor is at least 36 in. (0.91 m).
• You do not have to change the safety distance if the blanked area is entirely blocked by a fixture
from the transmitter to the receiver so that operator intrusion into this area is impossible.
• Failure to comply with these instructions will result in death or serious injury.
PREVENT UNAUTHORIZED PERSONNEL FROM PROGRAMMING FIXED BLANKING
WINDOWS
A method of supervisory control, such as use of a key switch, must be employed to limit access to
Shadow 8’s programmable fixed blanking feature so that only a qualified person is able to program
a fixed blanking window.
Failure to comply with these instructions will result in death or serious injury.
MARK CORRECT MINIMUM OBJECT RESOLUTION ON SERIAL NUMBER LABELS
During installation strike out with a permanent marker the minimum object resolutions printed on
the serial number labels of receivers and transmitters that do not apply to your system. Make sure
to adjust the object resolution based on any blanking windows that have been set (see Increasing
Safety Distance To Compensate for Blanking Windows, page 2-10). Four object resolutions are
printed on each label.
DANGER
!
DANGER
!
NOTICE
Содержание Shadow 8
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