Nmea Input; Power Supplies And Drive Unit - Raymarine Autohelm ST7000 Installation Instructions Manual

If preferred, any 2 core screen cable which has
the following specification may be used in the
place of the SeaTalk cable.
Screen
2 Cores
28
Minimum Copper Area
0.5mm
2
0.5mm
2
2.3.4 D.C. Power Supplies and Drive
Unit connections.
The ST7000 requires two D.C. power supplies,
one, a heavy duty supply (which connects via
spade connectors to the end of the course
computer) and secondly a light duty supply (which
connects into the course computer connector
box). Flexible connection tails fitted with insulated
spade connectors are supplied with the course
computer to connect the heavy duty power supply
(Blue and Brown) and drive unit motor
connections (Red and Black).
All four flexible wire tails are pre-connected to a
four-way heavy duty terminal block for Connection
to the main power cabling. Similarly, the drive unit
is supplied with flexible tails for the motor power
connection (Red and Black).
Before commencing
interconnecting terminal block should be screwed
into a position where they will remain dry and
protected. When planning the position of me
course computer (ref.2.1.1), it is important to
reduce the overall length of heavy power cable
between the drive unit and the vessel's central
power distribution panel to a minimum.
Excessive lengths will generate losses in the
cable and will reduce system performance. In
addition, the cable length between the course
computer and drive unit must be less than 5m (I
6ft).
Having sited the course computer, measure the
total cable length between the drive unit and the
vessel's central distribution panel and select the
appropriate cable size from the table below
depending on the drive unit used.
Type 1 Drive Units
Total Cable
Cable Type
Length
Up to 7m 50/0.25
Up to 10M 56/0.3
Up to 16m 84/0.3
power cabling,
Copper Cable
Area Gauge
2.5mm 14 AWG
2
4.0mm 12 AWG
2
6.0mm 10 AWG
2
all