Sub-Sea Electronics Pod - Teledyne 440 System Manual

2 – System Overview

2.3.2 Sub-sea Electronics Pod

The SEP performs several functions:
❐
Timing and amplitude control for the pulsed-current drive to the search-coils.
❐ High-speed data acquisition and digital signal processing.
❐
Interpretation of data from an appropriate sub-sea altimeter connected to the SEP 'Altimeter'
port.
❐ Communication with the SDC through the ROV umbilical using whichever communication
method you have established for the System.
❐
Interfacing with the Teledyne TSS 350 or 350 Powertrack Cable Survey System when you use
the 440 System within a Dualtrack installation.
Non-volatile memory within the SEP stores certain installation-specific parameters that the SEP needs.
You may examine and change these configuration parameters remotely from the SDC. See
"System Configuration"
EPROM memory devices within the SEP store the software that controls all the SEP functions.
The SEP is a sealed unit with six ports:
On one end-cap:
❐
Power/comms
This port accepts the 12-way connector from the PSU, carrying stabilised and conditioned DC
supplies and the bi-directional communication signals.
❐
Altimeter
You may connect the Teledyne TSS or Teledyne Benthos sub-sea altimeter directly to this port.
The port provides DC power to operate these types of altimeter and a signal path for their
RS232 communications.
On the other end-cap:
There are four electrically identical connection ports for the four active channels. The 440 System uses
only channels 1 to 3 during normal operations, although you may use channel 4 as a substitute if one
of the other channels fails. You must connect each coil to its correct port on the SEP. See
"Search-coils" on page 4-5
You will damage the SEP if you leave any port exposed to seawater during
deployment on the ROV, even if you are not using the 440 System.
You must fit the supplied blanking plugs to any port on the SEP that you will not be
using during ROV deployment.
See section 3.1.2 "SEP and PSU" on page 3-3
2-6
and Chapter 6 "Operating software"
for instructions to connect the coils.
© Teledyne TSS
for instructions to configure the System.
CAUTION
for instructions to install the SEP and the PSU.
Chapter 5
section 4.1.5
DPN 402196 Issue 4.1