User’s manual NX-4a Side 8
If more than one detector is installed, lower sensitivity setting is recommended. Do your own test of
the sensitivity by walking into the detection area and see if the alarm reacts normally. The alarm
should sound after about 30 seconds of motion in the detection zone (Standing still will not be
detected). Do not set it too sensitive because it will also detect pets, sunlight, warm winds and so on,
so the delay time set by the sensitivity knob is required to filter out those false alarms. To high
sensitivity will let false signals through.
Wiring external outside lights/spotlights
You can use the maybe already existing
outside lamp by connecting a wire directly
from NX-4 to the outside lamp without any
fuse or switch. The light will then be lighted
automatically by NX-4 (when powered) and
manually with the existing light switch.
You can also connect this output to the hazard
lights or marking lights if desired. We do not
recommend connecting any alarm horn to this
output because of the nature of Infrared
detectors and possibility for false alarms.
If external spotlights are installed, 20-55W is
recommended (max 110W without extra
relay). Remember that the power circuit to
NX-4 must be able to carry the load from the
lamps. The power circuit should have 15A
spare capacity. If less powerful lamps are
being used, the power circuit to NX-4 can be
smaller, but if so, replace the internal fuse FU1 with a smaller one.
Wiring external lamps with extra relay
If more outside lamps
than NX-4 can drive
directly are desired, an
extra relay can be used to
increase the load capacity.
Also if extra relay is used,
the NX-4 itself does not
have to carry the load
from the lamps and can be
powered with thinner
wires and from a less
powerful circuit. This
may simplify installation
especially if lamps are
installed later and NX-4
already is powered from a circuit without capacity to carry the load of outside lamps.
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