LINK Systems Max Presence Sensing Device - Manual (Page 39)

Link Lite Black Max Section 4 - Operating Instructions
4-6
NOTE! When FIXED BLANKING is
used, removal of the object(s) that blocks
the transmitter light from the receiver
sensor channel will automatically unblank
the sensor channel.
If the object(s) that requires sensors to be
blanked moves up and down enough
(through vibration or shock or other
effects) in the sensing field that a sensor is
sometimes blocked and sometimes not, you
must use one of the seven fixed blanking
tabs provided with your Black Max unit to
cover the receiver sensor so that it won't
automatically unblank during those times
when the object doesn't block the sensor.
The blanking tab is a metal strip with a
locking screw that inserts into the wedge
shaped channel next to the red acrylic lens
on the Black Max receiver. You must slide
the blanking tab into position to cover the
sensor channel to be blanked and lock it in
place with its set screw. Figure 4.5
illustrates the use of the blanking tab.
Figure 4.5: Front View of Black Max
Main Receiver Unit Showing Channel 3
Sensor Blocked by Blanking Tab.
To unblank any sensor channel using fixed
blanking with blanking tabs, you must
remove both the object in the sensing field
that requires blanking and the blanking tab.
As soon as the sensor sees its transmitter
light, it will automatically unblank itself.
NOTE! Because fixed blanking provides
"windows" in the Black Max sensing field,
you must follow the safe blanking
requirement of section 4.2.4 when it is
used.
4.2.3 Combination VARIBL ANKING
and FIXED BLANKING
You can select both VARIBLANK and
FIXED BLANKING if necessary for a
particular production setup. However,
when you use both VARIBLANK and
FIXED BLANKING only six channels may
use FIXED BLANKING. Rotate the
blanking mode selector switch to the
SELECT position and release it to the
PROGRAM position repetitively until both
the VARIBLANK and FIXED BLANKING
MODE indicator lights are on, as shown in
Figure 4.6.
Figure 4.6: CombinationVARIBLANKING
and FIXED BLANKING selected.
Place any blanking tabs in place that are
necessary for use with channels to use
FIXED BLANKING, return the blanking
mode switch to the RUN position and
remove the key from the switch. Channels
that use FIXED BLANKING will have
blinking channel indicator lights or will be
indicated by being covered by blanking
tabs. Since VARIBLANK is also selected,
two channels that are not FIXED
BLANKED must be blocked for the Black
Max to provide a stop signal.