Installation
SeaKing & SeaPrince Imaging Sonars
0374-SOM-00001, Issue: 08
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© Tritech International Ltd.
ARCNET cards (AIFV3/V4). Conversely, Series 2 Sonar, Profiler and other heads cannot be
directly used with SeaKing and Seanet systems. Note that the SCUv5 units do not have a
dedicated AIF ARCNET card but instead process the ARCNET data through the SCU main
board. In terms of software and hardware interface though this is exactly the same as uing
an AIF card as in the older SCUv4 units.
An optional RS232 interface can be provided to allow telemetry connection through a fibre
optic system capable of 115kbps transmission. The RS232 interface is available in the
guise of an RS232 to ARCNET converter PCB that is installed in a dry pod on the vehicle.
Alternatively, an intelligent 4000m pressure rated Junction Box will provide the RS232
interface to the network of SeaKing ARCNET devices.
Note
SeaKing units with a V6 COM PCB are capable of using a single-head RS232
or RS485 interface. Older units with a COMv5 PCB, or older, will only be able
to communicate via RS232.
Super SeaPrince units are capable of communicating on all three protocol
options as standard
Refer to the Seanet Pro and Seanet SCU manuals for more information on serial RS232/
RS485 configuration and baud setup.
3.3.2. Subsea Sensor Electrical Installation
If using a rectified transformer PSU, the output of the PSU must have a filter capacitor of not
less than 470μF, for each head being powered. If an unregulated PSU is used, then make
sure that the voltage value measured at the head is in the range 20-36v DC, in power on/off
and running conditions. If powering the head(s) down a long lead or umbilical, the maximum
recommended loop resistance of the power line must not exceed 10Ω for one head, 5Ω for
two heads, and 3Ω for three heads. If the supplied voltage is less than 20V DC (or 12V for
Super SeaPrince DST) the sonar head may not operate correctly.
Caution
Never try to make SeaKing or SeaPrince sonar work down a long cable by
increasing the PSU output voltage above 36V DC (or 56V DC for the high voltage
Super SeaPrince).
3.3.3. Ground Fault Monitoring Equipment
The power supply within SeaKing subsea devices includes an electrically isolated DC-DC
converter front-end, There is a small capacitive connection to the sonar chassis which should
not noticeably affect any impressed current ground fault indicator (GFI) equipment.