Subsea Sensor Electrical Installation; Ground Fault Monitoring Equipment - Tritec SeaKing Profiling Sonar Product Manual

Installation
pair cable. It is possible to interface the ARCNET to wide band multiplexer
systems - contact Tritech International Ltd for details.
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
10ohm for one head, 5ohm for two heads, and 3ohm for three heads. If
the supplied voltage is less than 20V DC the profiler head may not operate
correctly.
!

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 profiler chassis which should not noticeably affect any impressed current
ground fault indicator (GFI) equipment.
0374-SOM-00002, Issue: 04
Note
For an ARCNET connection termination resistors need to be fitted
at each end of the umbilical. Refer to Appendix A, ARCNET
Termination
Note
There is a single-head RS232 option built into SeaKing heads
but this is not multi-drop (i.e., multiple heads cannot be used
simultaneously in this mode). An RS485 option is also available
in later models which allows for the operation of multiple heads
provided each had has its own communication link (it is not possible
to daisy-chain or ping sync RS485 heads together).
Caution
Never try to make SeaKing profiler work down a long cable by
increasing the PSU output voltage above 36V DC.
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SeaKing Profiling Sonar
© Tritech International Ltd.