LINK Systems Max Presence Sensing Device - Manual (Page 30)

Link Lite Black Max Section 3 - Installation
3-25
9. Take the test bar or strip used in steps 4
through 6 and insert it into the sensing field
between the transmitter and receiver. The
machine stopping action should immedi-
ately be initiated when the sensing field is
interrupted. An exception to this occurs
when the Black Max is muted during a part
of a machine cycle that is not hazardous.
The interruption of the sensing field should
then only stop the machine action during
the hazardous portion of the cycle check to
see that the machine does stop in all
hazardous parts of the stroke. Repeat this
test several times, making sure that the
machine stops properly and that the safety
distance requirement of section 3.3 is met
for the stopping time encountered under
the conditions of this test. If the machine
that the Black max is installed on has
multiple operating modes (such as Inch,
Single Stroke, and Continuous on a
mechanical power press) repeat this test in
all modes to verify the intended stopping
action. If the stopping mechanisms of the
machine seem to be working improperly or
erratically, notify the user/employer and
request that a maintenance person qualified
to adjust or repair the stopping mechanisms
be assigned to do so. Don't proceed to the
next step until the problem is corrected.
10. If all requirements of the preceding
checkout steps are met, the installation of
the Link Lite Black Max components of the
safety system is complete. If the in-
staller(s) of the Black Max components has
been contracted or assigned the responsi-
bility to provide any other necessary
supplemental guarding components of the
safety system, proceed to section 3.9. If
someone else is to install other components
of the safety system that may be required,
the Black Max installer(s) should notify the
user/employer that his phase of the
installation is complete.
3.9 Supplemental Guard Installation
Requirements
Although a safety system design for an
industrial machine that uses only light
curtains, such as the Link Lite Black Max
units in addition to the machine compo-
nents involved in stopping hazardous
action can often be accomplished, it is
sometimes necessary to make and install
barriers to supplement the safeguarding
function intended to be performed by the
Black Max sensing field(s) to comply with
OSHA and ANSI standards. Often, the
requirement and physical configuration for
barriers can only be determined after the
Black Max installation. The safety dis-
tance requirement, configuration of the
machine, size, and location of the light
curtain and tooling can all be factors which
affect the specific application. There are
two areas of concern that must be consid-
ered when determining whether supple-
mental guards or barriers are required.
1. Any light curtain, including the Black
Max, only protects people who reach
through its sensing field as they approach
the hazard to be safeguarded. Therefore,
once the Black Max units have been
installed, if it is possible to enter the
hazardous area over, under, or around the
Black Max(s) sensing field(s) from any
normal position associated with the tasks
of operators or other personnel, barriers
must be installed to cause the only path to
the hazard to be through the Black Max(s)
sensing field(s).
2. The Black Max will not protect people
if the required safety distance discussed in
section 3.3 places the main transmitter and
receiver far enough away from the hazard
that a person can assume any normal
position between the Black Max sensing
field and the hazard, i.e., so that he can