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4 – Electrical Installation

DPN 402197 © TSS (International) Ltd Page 3 of 18

4.1.1 Ground Connections

CAUTION

To prevent severe corrosion of the sub-sea components, you must make adequate

grounding provisions for them. If corrosion occurs throughout the System, perform-

ance will degrade and eventual catastrophic failure will occur.

You must provide a good ground connection at sea water potential on pin number 2 of

the 8-way ‘Power/Comms’ port of the SEP. Use good waterproof connectors or splices

to make the connection.

If you provide the 350 System with an inadequate ground connection, parts of the

System will act as ‘sacrificial anodes’ and will slowly decay during sub-sea opera-

tions. This will occur whether or not you use the 350 System.

To prevent corrosion affecting the System in this way, you must connect pin 2 of the

8-way SEP ‘Power/Comms’ port locally to the ROV using a ground connection at sea

water potential.

IMPORTANT

To ground the SEP use only a local grounding point on the ROV frame. Do not use a

core within the umbilical to ground the 350 System because there will inevitably be a

potential difference between the ROV and the surface vessel.

The SDC accepts an AC electrical supply in the range 85 to 265V (47 to 63Hz). The power demand is approxi-

mately 250VA.

Data communications from the SDC to the ROV umbilical. These can be 2-wire or 4-wire 20mA digital current loop,

or RS232. The default configuration is RS232.

Power and communications cable (or ‘ROV Tail’) from the ROV to the SEP. This cable has cores to carry the com-

munication signals that pass between the SEP and the SDC, and power cores for connection to the ROV electrical

distribution system. Refer to Table 4–1 for details of the cable.

The maximum current drawn from the supply is approximately 3.1A (at 110V to 120V AC) when the SEP is

installed within a TSS Dualtrack System. When operating as a stand-alone 350 System, the SEP draws approxi-

mately 0.3A from a 110V to 120V AC supply.

All sub-sea connections are to sealed ports on the SEP. You must fit a proper blanking plug to any port that does

not have a connector before you deploy the System underwater.

The coil connection cables each have a single 12-way connector for connection to the SEP, and three 8-way right-

angled connectors for connection to the detection coils. You must connect the three short branches of the cables to

the correct coils in each triad as identified by their attached labels ‘vertical’, ‘lateral’ and ‘fore-aft’.

There are three identical detection coils in each triad. Note the serial number and calibration code on each coil to

check that the SDC software includes the correct details.

Figure 4–1 shows the altimeter cable connecting directly to the SEP. You may connect the RS232 signals from the

altimeter to the ROV multiplexer and pass them independently through the umbilical to the surface vessel. If you

use this method, extract the signal from the demultiplexer and apply them to the COM2 serial port on the SDC.

You may connect the TSS or Datasonics altimeter types directly to the SEP at the ‘Altimeter’ port as shown. You

may use other types of altimeter with the System if you prefer.

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