
2 – System Overview
DPN 402197 © TSS (International) Ltd Page 9 of 14
2.4 SUB-SEA COMPONENTS
The sub-sea installation comprises the following component parts:
❐ A Sub-sea Electronics Pod (SEP)
❐ A coil array with six identical sensing coils arranged in two coil triads
❐ Frame components to mount the coils onto the ROV
❐ A sub-sea altimeter
❐ Cables to interconnect the sub-sea components of the 350 System and to connect
them to the ROV electrical distribution system.
2.4.1 Sub-sea Electronics Pod
The SEP performs several functions:
❐ Power supply conditioning for the sub-sea components of the 350 System
❐ High-speed data acquisition and digital signal processing
❐ Data acquisition from a sub-sea altimeter connected to the SEP ‘Altimeter’ port
❐ Calculation of all target co-ordinates
❐ Communication with the SDC through the ROV umbilical using whichever commu-
nication method you have established for the System.
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 – refer to Section 6.2 for instructions to configure the System.
EPROM memory devices within the SEP store the software that controls all the SEP
functions.
There are two versions of the SEP available that differ only in their electrical supply
requirements. A label on the SEP identifies the electrical supply required by the unit:
❐ The standard SEP operates from a single phase AC electrical supply (45 to 65Hz)
in the range 110V to 120V (maximum power demand 3.1A when used in a Dual-
track installation).There is a 2A quickblow fuse on the PSU Board inside the SEP.
You must provide additional fuse protection for the equipment by fitting a 3.15A
quickblow fuse between pin 3 of the Power/Comms cable and the supply live.
Refer to sub-section 4.1.3.1 for instructions to connect power to the SEP.
❐ Optionally, TSS can supply a SEP configured to operate from a single phase AC
electrical supply (45 to 65Hz) in the range 220V to 240V (maximum power
demand 1.8A when used in a Dualtrack installation). You must include a 2A quick-
blow fuse in between pin 3 of the Power/Comms cable and the supply live if your
System uses a 240V nominal electrical supply.
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