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9 – Maintenance
Chapter 10 "System Drawings"
9.1.1 Power Supply Pod
The PSU contains the Power Supply PCB assembly and the –Filter Assembly – see Figure 9-2.
Figure 9-2: PSU interconnection diagram
9.1.1.1 Power Supply PCB
(See drawing 490228 in
Power for the sub-sea installation comes from the ROV electrical supply. Normally this will be nominal
110V single phase AC rated at 350VA. For special applications, Teledyne TSS can supply the 440
System with a PSU that accepts nominal 240V AC instead.
The PSU uses switched-mode circuitry to convert the electrical supply from the ROV into the four
conditioned and stabilised DC supplies required by the SEP. These are:
❐
+5V (2A) for use by the control logic.
❐
+15V (500mA) for use by the analogue electronics.
❐
–15V (500mA) for use by the analogue electronics.
❐
–15V (10A) to drive the search-coils.
Cooling of the supply is by direct thermal conduction to the PSU housing assisted by a small fan.
There is a danger of electric shock from electrical voltages in the PSU. Do not
open the PSU with power connected.
Except for the fuse on the input, the Power Supply board is NOT repairable in the
field. You must renew the board as a complete unit if you suspect it has developed
a fault condition.
9-2
includes the drawings for the System.
Chapter 10 "System
Drawings")
© Teledyne TSS
WARNING
DPN 402196 Issue 4.1
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