WX16 User Manual | 65
damage unless the other two paths provide a better earth connection allowing surge
energy to bypass the electronics.
When an antenna is located outside of a building and outside of an industrial plant
environment, external coax surge diverters are recommended to further minimize the
effect of surge current in the inner conductor of the coax cable.
Coax surge diverters have a gas-discharge element which breaks down in the
presence of high surge voltage and diverts any current directly to a ground connection.
A surge diverter is not normally required when the antenna is within a plant or factory
environment, as the plant steelwork provides multiple parallel ground paths and good
earthing will provide adequate protection without a surge diverter.
7.6.2 Connections to Other Equipment
Surges can enter the wireless unit from connected devices, via I/O, serial or Ethernet
connections. Other data devices connected to the wireless unit should be well
grounded to the same ground point as the wireless unit.
Special care needs to be taken where the connected data device is remote from the
wireless unit requiring a long data cable. As the data device and the wireless unit
cannot be connected to the same ground point, different earth potentials can exist
during surge conditions.
There is also the possibility of surge voltages being induced on long lengths of wire
from nearby power cables. Surge diverters can be fitted to the data cable to protect
against surges entering the wireless unit.
The same principle applies when the I/O device is not close to the wireless unit, thus,
the risk of surge increases. Surge diverters for I/O wiring are available to protect the
wireless unit.
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