Civil Engineering Reference
In-Depth Information
Main power supply
LAN
Fluorescent
lamps
Outputs
Ballast
Controller
Control signal (0-10V)
Common (0V)
Incandescent
lamp
Inputs
Dimmer
Figure 10.1
An example of conceptual configuration of analogue lighting control.
Main power supply
Fluorescent lamps
Incandescent lamps
Ballast
Ballast
Dimmer
LAN
Figure 10.2
An example of conceptual configuration of digital lighting control.
but does not specify any 'OFF' command. Separate provision is needed for
'OFF' control and for load circuit isolation. It is worth noting that 0-10 V
is also widely used as the analogue control signal for electronic ballasts of
fluorescent lamps.
Prior to the implementation of LAN-based digital systems, some systems
used a multiplexed analogue control in order to use 'one wire' to control
multiple dimmers. However, this type of technology is being phased out today
and digital control technology using a network concept is widely used. The
aim of controlling many lights through one wire is now achieved using more
effective network-based digital control technology.
Nowadays, analogue control is still used widely in lighting control for
sensor signals and control signals. For large-scale lighting-control systems,
digital control should be used. In fact, digital control is also finding increas-
ingly wide application in sensor signals and control signals. Figure 10.1
illustrates an example of conceptual configuration of a lighting-control sys-
tem using a standalone controller employing analogue control. The sensors
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