Shadow 8 User Manual
1139300
Installation and Checkout
2-11
ANSI safety distance formula, a one-beam fixed blanking window increases the safety
distance by approximately 5.38 in. (136.6 mm).
Beyond one beam, the object sensitivity for a fixed blanking window becomes large enough
for an entire arm to penetrate the light curtain without being detected, and 36 in. must be
added to the safety distance.
The safety distance does not need to be increased if the area programmed as a fixed blanking
window is entirely blocked by a fixture such that operator intrusion into this area is
impossible. For instance, you might have a work table that juts out into the light field but
takes up the whole space between the transmitter and receiver that is “blanked” and, therefore,
unprotected by the light curtain.
Shadow 8’s one-beam floating blanking window does not have a positional tolerance. To
calculate the safety distance for a one-beam floating window, add the space between beams
(i.e., 0.79 in., or 20 mm) to Shadow’s object sensitivity with no beams blanked (i.e., 1.18 in.,
or 30 mm) to get an adjusted object sensitivity of 1.97 in. (50 mm). This yields a Dpf of
5.76 in. (146.3 mm), or a 2.69 in. (68.3 mm) safety distance increase for the one-beam
floating blanking window.
Since Shadow 8’s floating blanking window may be used in any segment in a multi-segment
installation (see Setting a Floating Blanking Window, page 3-7), the safety distance for every
segment must be increased by 2.69 in. (68.3 mm).
DO NOT CREATE A FIXED BLANKING WINDOW GREATER THAN ONE BEAM UNLESS THE
ENTIRE AREA BETWEEN TRANSMITTER AND RECEIVER IS OBSTRUCTED
Do not blank more than one beam unless the entire area between transmitter and receiver is
blocked by a permanent fixture or is guarded.
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
!
NOTICE
Содержание Shadow 8
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