LINK Systems Max Presence Sensing Device - Manual (Page 21)

Link Lite Black Max Section 3 - Installation
3-16
shown in Figure 3.15 will configure the
relay cycle circuit for 115VAC input
voltage between terminals 1 and 2.
Some machines use programmable logic
controllers (PLCs) as the machine control.
The Black Max must never be connected to
only the inputs of a single PLC controller.
Always contact Link before using a Link
Lite Black Max as a protective device on a
machine with a PLC control. Most PLC
controls do not meet OSHA's control
reliability requirement for use of a presence
sensing device.
3.5.4 Connections Between Main Black
Max Units and Remote Segments
Units
Connections between main Black Max
transmitter and receiver units and remote
segment units are accomplished by a cable
that terminates inside the main and remote
units in a ribbon cable plug-in connector.
The cable enters each unit enclosure
through a water and oil tight screw on
fitting. See Figures 3.16 and 3.17. The
remote segment unit may be connected to
either end of the main unit by removing the
screw-in plug in the large hole in the end
cap, running the ribbon cable through the
hole, and screwing the cable fitting into the
hole. Always leave the screw-in plug in
place on the unused end of the main
transmitter or receiver unit to retain the
NEMA 4 performance of the enclosure. In
some cases, two remote segment units may
be used, one off of either end of the main
transmitter or receiver enclosure. This is
illustrated in Figure 3.18.
3.6 Setting The Black Max Transmit-
ter Power Level
After mounting and electrically connecting
the Black Max transmitter and receiver
units, the transmitter power must be set for
the separation distance between the trans-
mitter and receiver. Using more power
than necessary to transmit between trans-
mitter and receiver is undesirable because
of the possibility that the excess light
energy can be detected by other Black Max
receiver units on other machines. This
cross talk would result in nuisance stops on
the other machines. Also, the life of the
infrared light emitting diodes in the trans-
mitter is somewhat dependent on power
level. These components will have pro-
longed life at lower power levels.
To set the transmitter power level, open the
door of the main transmitter enclosure,
locate the small 4 position DIP switch on
the outside edge of the transmitter logic
board, and adjust the switch positions
according to the power level table located
on the inside of the transmitter door. The
location of the 4 position switch and power
level table are shown in figure 3.19.
Always adjust the power level correctly for
the separation distance between the Black
Max transmitter and receiver.
WARNING! Never use a Link Lite
Black Max on a machine controlled by
a PLC without first consulting Link
Systems as to whether the Black Max
should be used and how it should be
connected to the control. Failure of the
PLC control could cause the machine to
fail to stop even though the Black Max
is functioning properly if the control
system is not designed to provide a stop
signal to the machine in the event of
a component failure or program fault.
Serious injury or death may result from
the hazard intended to be safeguarded.