Videotec GEKO IRH, Instruction Manual

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8 MNVCIRHS_1511_EN
6.2.4 Twilight sensor activation
threshold adjustment
The illuminator has an integrated twilight sensor that
allows its automatic activation and deactivation at
predefined luminous conditions.
The twilight sensor is set in the factory at a
predetermined luminous level, suitable for most
installations (approximately 50lx). If you want to
adjust in different ways the threshold, loosen the
plug on the illuminator rear and proceed for the
adjustment with a screwdriver.
By rotating the trimmer clockwise, the night mode
changeover is anticipated (at a greater luminous
value). By rotating the trimmer anti-clockwise,
the night mode changeover is delayed (at a lower
luminous value).
Fig. 11
Wait for appropriate brightness before switching on
the illuminator. Rotate the trimmer slowly until the
LED on the side of the trimmer switches on. Once the
intervention threshold has been surpassed (LED on),
rotate it slightly in the opposite direction.
After making the adjustments make sure
that the plug is closed tight to ensure perfect
sealing.
When setting the illuminator to be switched
on automatically by the embedded light
sensitive switch, make sure to insulate the
remote control (telemetry) cables in the
power cord (green and red colors).
6.2.5 Disabling the twilight sensor
To disable the lamp’s automatic switch-on set the
brightness to minimum (turn the potentiometer all
the way anticlockwise). With this setting the lamp can
only be switched on by closing the telemetry contact,
if the system is equipped with a central light sensitive
switch or a remote-controlled contact.
6.2.6 Power and control cable
The illuminator is supplied with a 2m (6.6ft) long
power and control cord.
Power cables
(white, black): The illuminator can
be powered either by 24Vac/Vdc or 12Vdc. Provide
power to the black and white cable pair (white e
black, the polarity is irrelevant). For proper operation
please refer to the charts, taking into account the
power supply and the type of illuminator installed (
6.2.7 Cable technical specifications, page 9).
To avoid product malfunctions connect 2
illuminators maximum for each power supply.
Remote control (telemetry) cables, green and
red colors
: The control cable (telemetry) lets you
turn on the illuminator remotely by means of a dry
contact applied between the ends of the green and
red cables. For proper operation, make sure that the
photocell is disabled (6.2.5 Disabling the twilight
sensor, page 8). Close the contact to turn on the
illuminator. Open the contact to turn it off.