LINK Systems Max Presence Sensing Device - Manual (Page 37)

Link Lite Black Max Section 4 - Operating Instructions
4-4
When muting is used, it must be checked
for proper adjustment each time mainte-
nance is performed on the machine, the
machine control, or the Black Max.
7. The use of Link Lite Black Max light
curtains as a safeguarding component on a
machine does not remove the need to heed
the warnings and follow the operating
practices and instructions supplied by the
machine manufacturer.
8 . Because no safeguarding system,
including those that use the Link Lite
Black Max as a safety component, abso-
lutely prevents injury to personnel from all
sources of human error and machine
related failure, operators, die setters,
maintenance personnel, and others must
use the same caution and good practices in
their tasks as if no safety system were
present to attain greatest enhancement of
safety.
4.2 Blanking Instructions and Re-
quirements
In order to provide "windows" in the field
of vision for machine setups where some
object(s) must of necessity intrude into the
main Link Lite Black Max sensing field, a
keyed selector on the main receiver unit is
provided to select VARIBLANK, FIXED
BLANKING, or a combination of these
two types of blanking. Only a limited
number of sensors in the main Black Max
sensing field can be blanked. Sensors in
remote extension Black Max units used for
supplemental safeguarding cannot be
blanked.
4.3 VARIBLANK
All blanking modes for the Link Lite Black
Max are selected using the keyed selector
switch located on the front door of the
main Black Max receiver unit. The keyed
selector switch has three positions - RUN,
PROGRAM, and SELECT. The switch has
two stable positions, i.e., positions that it
will stay in when turned there by the key.
These positions are RUN and PROGRAM.
The key has one "momentary" position, i.e.,
if the key is used to turn the switch to the
SELECT position, when the key is released
to key and switch will return to the PRO-
GRAM position.
To select the VARIBLANK mode, use the
key to turn the RUN/PROGRAM/SELECT
switch to the select position. Then release
the key to let the switch return to the
PROGRAM position while observing the
two LED indicators beside each of the
blanking mode choices located on the front
door of the main Black Max receiver unit.
The blanking mode choices are NO
BLANKING, VARIBLANK, and FIXED
BLANKING. Each time you rotate the key
to the SELECT position and release it to
the PROGRAM position, the lights will
change to indicate a different blanking
choice. To select to VARIBLANK mode
only, turn the key to the SELECT position
and release the key to the PROGRAM
position the required number of times to
get only the VARIBLANK mode indicator
lights on, as shown in Figure 4.3, then
turning the keyed selector to the RUN
position.
WARNING! If muting is used, and
the muting means is improperly
installed or adjusted, the Black Max
stop signal may be bypassed in a
hazardous portion of the machine
cycle. Serious injury or death can
result from improper muting.