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2.2.2.2
Circuit breakers
WARNING
2.2.3
Heat evacuation and installation
2.2.3.1
Units and heat dissipation
FOX615
Installation
The minimum wire gauge required for the conductors of the power supply
circuits (for one FOX615) between the terminal blocks A and the FOX sub-
2
rack is 4.0 mm
.
2
With 2 x 4.0 mm
wires for the power feed and 2 x 4.0 mm
power return the length of the PSC lines is limited to
− ≤ 3.7 m with DUPF1.
− ≤ 7.4 m without DUPF1.
Risk of operating trouble!
Attention to EMC properties!
Please note that the power feeding and returning wires must be arranged in
the wiring in such way that the magnetic induction is kept low.
→ Power cables with low inductivity are commercially available.
It is essential to fuse each power supply circuit (-V
FOX615 subrack at its power distribution point with a 30 A slow-blow fuse or
a circuit breaker ("CB 1" in
Hazardous electric currents. Risk of flashover and electric shock!
Omitting the fuses or circuit breakers in the power supply circuits might lead
to seriously damaged equipment or create a fire in the case of overload or
short circuits.
→ Make sure that the fuses or circuit breakers are correctly installed and
intact for each of the power supply circuits.
Traffic units operated in the FOX615 subrack can dissipate a high amount of
heat. To evacuate the heated air from the subrack, a passive or active cool-
ing can be used.
Passive cooling, i.e. without a fan unit, requires the deployment of specific
functional units. The maximum ambient temperature is reduced compared to
the actively cooled subrack. Please refer to "FOX61x System Description"
for the list of passive cooling FOX units.
Active cooling, i.e. with a fan unit, requires the deployment of a sub-
rack specific fan unit FAMO1.
Active ventilation with the FAMO1 fan unit is mandatory to prevent units from
overheating and to evacuate the excess heat from the units and the subrack.
For reliable operation of the FOX615, it is essential to evacuate the heat
from the FOX subrack and from its environment.
P R E P A R I N G F O R I N S T A L L A T I O N
BAT
Figure
1).
2
wires for the
= -48/-60 V
) for the
DC
15
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