LINK Systems Max Presence Sensing Device - Manual (Page 9)

Link Lite Black Max Section 3 - Installation
3-4
following formula. Use this formula only
for M.O.S. less than 2.75 inches.
D
pf
= 3.4 (M.O.S. - .276)
Figure 3.2 illustrates the penetration depth
factor in graphical form
Figure 3.2: Graphical Representation of
penetration depth factor, D
pf
, vs. minimum
object sensitivity.
The minimum object sensitivity in inches
for Link Lite Black Max light curtains is
specified on a label on both transmitter and
receiver enclosures. Standard range units
(to 50') for primary point of operation
guarding have a M.O.S. of .95 inches.
Long range units (to 100') for primary point
of operation guard-ing have a M.O.S. of
1.25 inches. Perimeter guarding models
and supplemental remote extension guard-
ing units may have larger M.O.S.. Always
determine M.O.S. from the labels on the
actual units used. Always verify that both
receiver and transmitter units have the
same M.O.S. stated on their labels before
installing.
PLEASE NOTE! When individual
channels are to be blanked (turned off) to
allow fixtures or obstructions that extend
into the primary Black Max sensing field,
additional safety distance may be necessary
to account for the increase in M.O.S. due to
blanking. Blanking is possible on Black
Max units with .95" M.O.S. and 1.25"
M.O.S.. Each contiguous (side by side)
channel blanked increases the M.O.S. by
.75".
When the Link Lite Black Max is used on
machines such as power presses, press
brakes, and other machines that have slides
used to impart motion and force to tooling,
the stop time must be measured at approxi-
mately midstroke in the closing (hazard-
ous) portion of the stroke. The best
stopping performance of a machine will be
attained when all machine adjustments that
affect stopping time are adjusted within the
machine manufacturer's specifications. It
is the user/employer responsibility to
always maintain mechanisms that affect
stopping time in good repair and adjust-
ment where safety devices like the Black
Max depend on the stopping action of the
machine to protect personnel.
Where a time-base brake monitor is used
on a press or other machine that is to have
a Black Max installed for point-of-opera-
tion safeguarding, the stopping time, T
s
,
can be determined by use of the brake
monitor. On time base brake monitors
equipped with stop time display, stop the
machine at approximately the mid point of
the die closing portion of the stroke and
read the stopping time displayed. For a
time based brake monitor with no direct
display of stopping time but that has a dial
or other method of setting allowable stop
time, make repeated machine stops near
midstroke, adjusting the time setting each
time until the lowest time setting that
results in the brake monitor allowing a
successive stroke without resetting is
found. This is the stop time, T
s
, that must
be used.