8
ST50 Plus Depth Operation and Installation Handbook
1.6 Ring Connection
Chapter 2: Transducer Installation
Installations with large numbers of instruments on a
bus may require
a second
connection to
power supply breaker to prevent
excessive voltage drops. Refer to the
list to determine whether a
second ring main is necessary.
Cable run
Single connection:
13 instruments maximum
Second connection:
26 instruments maximum
Cable run
Single connection:
7 instruments maximum
Second connection:
13 instruments maximum
The second
should be connected to the spare lead on the last
instrument in the chain and directed back to the circuit breaker.
2.1 Connection to the Control Head
The depth transducer is supplied, as standard, with a through hull
and
14m
of cable. The cable is equipped with a
connector that
plugs into a control head connector.
1.7 Connection to
Compatible Autopilots
If the installation includes a
compatible Autopilot the
ments may be connected to the
bus at any point. No independent
connection to the 12V power supply is necessary as the instruments receive
power from the Autopilot course computer.
To autopilot
B U S
Connection
To any further
ST50 Instruments
or Autopilot
Control Units
Chapter 2: Transducer
2.2 Transducer Selection
The type of depth transducer used is governed by the hull material. The
following list shows the appropriate transducer for hull type.
Transducer Type
Hull Material
Through Hull Plastic:
GRP (Glass Reinforced
Plastic),
Steel and
Aluminium
Through Hull Bronze:
2120 Retractable througb
hull:
GRP (Glass Reinforced Plastic), Steel and
Aluminium
2.3 Transducer Installation
depth transducers are supplied with detailed installation and maintenance
instructions.
These instructions, together with the following notes, should be read
thoroughly before attempting to install
transducer.