Lucom ER 75i User Manual page 26

For the majority of applications with a built-in modem in a switch board it is possible to
recognize two sorts of environments:
•
non public and industry environment of low voltage with high interference,
•
public environment of low voltage without high interference.
For both of these environments it is possible to mount modems to a switch board,
the following is no need to have examination immunity or issues in connection with EMC
according to EN 60439-1 ed.2:00 + A1:04.
For compliance of EN 60439-1 ed.2:00 + A1:04 specification it is necessary to
observe next assembly of the modem to the switch board:
•
for round antennas we recommend to observe a distance of 6 cm from cables and
metal surfaces on every side according to the next picture due to the elimination
of interference, while using an external antenna except for the switch-board it is
necessary to fit a lightening conductor,
•
before mounting a modem on sheet-steel we recommend using an external antenna,
•
for single cables we recommend to bind the bunch according to the following picture,
for this use we recommend:
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length of the bunch (combination of power supply and data cables) can
be maximum 1,5 m, if the length of data cables exceeds 1,5 m or in the
event of, the cable leads towards the switch - board, we recommend
installing over - voltage protectors (surge suppressors),
with data cables they mustn't carry cables with reticular tension
~ 230 V/50 Hz,
all signals to sensors must be twisted pairs.
DESCRIPTION