Wiring - CENTURION SYSTEMS INTERCOM HANDSET Installation Manual

SECTION 6

6. Wiring

Power Supply
The INTERCOM HANDSET operates off a 14V DC supply. The system is designed so that
power can be connected to any one of the components in the system.
If the system is being installed with a gate operator that can provide at least a 12V DC
150mA supply, the entry panel can be connected directly to this unit.
If the 12V DC gate motor supply dips when the motor starts up and the
intercom is being used at the same time, the speech quality might be
affected.
Alternatively if battery power is not available at the entry panel, we offer a 14V DC supply
(mains adapter), that plugs into a universal two pin 220 to 240V AC mains supply socket.
A DC jack is provided on the output of the adapter that plugs conveniently into the cradle of
any one of the handsets in the system.
Terminals are provided on the cradle electronic module to terminate a 14V DC supply should
the supply being used not have a jack compatible with the socket on the cradle.
If the bus voltage (between terminals "1" and "2") is lower than 8V DC, power needs to be
applied at another unit in the system.
Wiring
The two wire bus of the INTERCOM HANDSET is polarised. If incorrectly connected the unit
will not operate, but it will not be damaged.
The length of the bus is limited to a maximum of 150m.
It might be necessary to double up on the thickness of the two wire bus
depending on the distance between the entry panel and handsets in the
system, and to which component the power supply is connected (handset
or entry panel). Refer to cable thickness schedule.
Cable Thickness Schedule
Location
From
of Power
Component
Supply
PSU
14V DC
Cable Distance
No. of
Wires
<100m
Two
0.2mm
2
Wires
Two
0.4mm
2
Wires
page 20
To
Component
<150m
0.4mm
2
0.8mm
2
WIRING
Location
of Power
Supply
PSU
14V DC
TABLE 2
www.centsys.com