Ground Connections; Care Of Sub-Sea Connectors; Power Supply Pod - Teledyne 440 System Manual

4.1.1 Ground Connections

If you provide the 440 System with an inadequate ground connection, parts of the System will act as
'sacrificial anodes' and will slowly decay during sub-sea operations. This will occur whether or not you
use the 440 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.
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 440 System because there will inevitably
be a potential difference between the ROV and the surface vessel.
These grounding provisions hold the 440 System at the same electrical potential as the sea water. This
prevents the occurrence of electro-chemical action between the System and sea water and minimises
galvanic corrosion.

4.1.2 Care of Sub-sea Connectors

To ensure reliable operation and to extend the life of the sub-sea installation, take the following
precautions to care for the sub-sea connectors used throughout the 440 System:
1. Keep both the connector and socket free from debris and salt build up.
2. Use warm soapy water to wash the connectors, and then rinse them with clean fresh water. Do
not use any solvents on the connectors. Allow the connectors to dry thoroughly in air before
you reassemble them.
3. Lubricate the mating face of the connectors with a very light spray of 3M Silicone Oil or Dow
Corning #111 valve lubricant or equivalent. Do not use grease.
Some silicone lubricants will crystallise when you subject them to sea water under
pressure. When this happens, the seals of the connector will degrade and allow
water to penetrate.
To avoid damage to the connectors, use only the lubricant oils mentioned above,
or equivalent oils that the manufacturer approves specifically for use on deep-sea
connectors and seals. When you apply the lubricant oil, use a very thin coating
only.

4.1.3 Power Supply Pod

The PSU 'Power/Comms' port accepts the AC electrical supply from the ROV and passes the bi-
directional communications between the SEP and the SDC. All electrical and communications
connections to the sub-sea installation are through the Power and Communications cable, or 'ROV
Tail'. Table 4-2 lists the pins of the connector on the Power and Communications cable, together with
the relevant core colours. Refer to this table as you make the connection to the ROV electrical
DPN 402196 Issue 4.1
IMPORTANT
CAUTION
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4 – Electrical Installation
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