10.Wiring
12
SANDOR PLUS SMA
POLITEC | INSTALLATION MANUAL - VER.2.6
10.1 Type of cable
Wiring requires you to
SEPARATE
the SHIELDED cable
of
the 12Vdc power supply plus all the signals
towards the control unit and the synchronism between the columns (e.g.2x0.50 + Nx0.22), from the
power cable of the 24Vac heaters (e.g.2x0.75) to prevent the input of alternating voltage disturbances
on the barrier.
N.B. it is absolutely necessary to shield the cable that supplies the 12 Vdc power supply and to
ground the metal braid.
The sizing of the cables depends on the consumption of the columns and on the resistance of the
cable itself according to the distances involved.
The table shows the cable cross-sections and the relative distances to ensure optimum performance
using the LAR22 power supply (12Vdc-2.5A/24Vac-300W) and a SANDOR PLUS SMA barrier (4TX +
4RX).
The LAR22 can supply up to 4 columns at the maximum extension (4TX +4RX).The LAR22 container is
metallic, so it must be placed inside a room or inserted in a watertight container if used outdoors.A
battery up to 18Ah can be housed in the container.
Alternatively, the LAR18 power supply (12Vdc-0.9A / 24Vac-60W) can be used to power a single
column (maximum configuration 4TX +4RX).The power supply is kept in a PVC container and can offer
IP68 protection if the junction boxes are made with suitable products available on the market.The
LAR18 can be combined with the LARB4 battery housed in a PVC container like the LAR18 but not with
the same IP rating.
CONDUCTOR CROSS-
SECTION
POWER SUPPLY BOARDS
12Vdc
POWER SUPPLY HEATERS 24Vac
0.5 mm²
165 m
35 m
0.75 mm²
245 m
50 m
1.5 mm²
490 m
100 m
2.5 mm²
820 m
165 m
4 mm²
1310 m
265 m
6 mm²
1975 m
400 m
