Videotec GEKO IRH - Manual (Page 9)

Instruc
tions manual - English - EN
7
7.1.5 Disabling the photocell
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 dusk switch
or a remote-controlled contact.
7.1.6 Power and control cable
The illuminator is supplied with a 2m long power and
control cord.
Power cables, black and white: The illuminator
can be powered either by 24Vac or 12Vdc. Provide
power to the black and white cable pair (the polarity
is irrelevant). For proper operation please refer to the
charts, taking into account the power supply and the
type of lamp installed (7.1.7 Maximum cable length,
page 7).
To avoid the breakdown of the product
connect maximum two illuminators for
each power supply.
Remote control (telemetry) cables, blue and
brown: The control cable (telemetry) lets you turn on
the illuminator remotely by means of a clean contact
applied between the ends of the blue and brown
cables. For proper operation, make sure that the
photocell is disabled (7.1.5 Disabling the photocell,
page 7). Close the contact to turn on the illuminator.
Open the contact to turn it off.
7.1.7 Maximum cable length
Depending on the type of illuminator (Low or
High Power) and on the supply voltage, apply the
following maximum distances for the power cables
(to be connected to the black and white wire pair).
CABLES SPECIFICATIONS (12VDC POWER SUPPLy)
Cable
section
(mm²)
AWG Maximum distance (m)
Low Power illumi-
nator
High Power illumi-
nator
0.5 20 10 6
0.75 18 16 9
1 17 22 12
1.5 16 32 18
Tab. 1
CABLES SPECIFICATIONS (24VAC POWER SUPPLy)
Cable
section
(mm²)
AWG Maximum distance (m)
Low Power illumi-
nator
High Power
illuminator
0.34 22 25 15
0.5 20 40 22
0.75 18 60 35
1.5 16 120 70
Tab. 2
The telemetry cable (blue and brown) should have a
minimum cross-section of 0.34mm² (AWG22) and a
maximum length of 200m.