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9 Maintenance
You will find it easier to identify and clear a fault on the 440 System if you have a full understanding of
the location of the individual sub-assemblies, and of the way they interact. This section helps you to
maintain and service the System by describing the main internal components of the sub-sea
installation.
Mains power supply voltages can cause death or serious injury by electric shock.
Only a competent engineer who has received the relevant training and experience
should perform maintenance work on electrical equipment.
Power-off and isolate the equipment from the electrical supply before you work on
any equipment that uses a mains power supply. Arrange to discharge any power
supply storage capacitors safely.
Observe all relevant local and national safety regulations while you perform any
maintenance work on electrically powered equipment.
Do not connect the equipment to an electrical supply until you have refitted all
safety covers and ground connections.
9.1 Circuit Description
The sub-sea installation consists of three principal parts:
❐
The coil array
❐
The Sub-sea Power Supply Pod (PSU)
❐
The Sub-sea Electronics Pod (SEP)
Figure 9-1
shows how these are interconnected.
Main board
Coil array
Driver
board
Figure 9-1: Simplified interconnection diagram
DPN 402196 Issue 4.1
WARNING - ELECTRICAL HAZARD
Altimeter
Piggy-back board
Analogue
board
SEP
© Teledyne TSS
Data
comms
Pi-filter
Switched
network
mode
power
Po wer
supply
from RO V
PSU
9 – Maintenance
9- 1
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