KVH Industries TracPhone F55 Installation Manual page 62

Chapter 8: Connecting Power
8.1.2 New Sub-D power connector
(Only applicable for new Sub-D power connector).
The BDU is delivered with a 1.5 m power cable; this can be extended according
to the recommendations below:
Red: +
Black: -
Cable Type
2
4 mm (AWG11)
2
10 mm (AWG8)
Make sure that cable
meets inductance
requirements.
a. When extending the power cable; positive and negative supply wires must be
installed closely together side by side to keep cable inductance low.
b. Ensure that cable inductance for the selected cable at the desired length is
below the 50 µH requirement.
The BDU is equipped with an internal 15 A Fuse, therefore no external fuse is
necessary in order to protect the BDU. However, in order to avoid short circuit
in the power cable/connector, the ships DC outlet should be protected by a 15-
20 A fuse or circuit breaker.
40
Length from source.
Source imp. < 50mΩ
0 - 20 m
a
20 - 50 m
> 50 m
a, b
Power cable selection
Length from source.
Source imp. < 100mΩ
0 - 15 m
15 - 35 m
> 35 m