2 – Installation
2-20
© Teledyne Limited
DPN 402197 Issue 7.1
4. Place the desiccant pack inside so that it fits between the Processor Board and the SEP hous-
ing. Make certain that there are no trapped wires or components and push the end-cap home.
5. Carefully align the end-cap to the SEP housing so that the four securing screws will engage
properly. If necessary, turn the end-cap slightly to achieve perfect alignment. Ensure that the
two holes for the button head screws align with the hardened stainless steel inserts on the end
of the SEP housing.
6. Insert the four M4 × 12mm A4 stainless steel screws and use the 3mm hexagonal key to
tighten them evenly. Insert both button head screws and tighten them lightly.
7. Reconnect the ground wire, the 8-way and the 6-way connectors on the ‘Power/Comms’ end-
cap. Make certain both locking clips on each of the connectors engage properly.
8. Align and engage the ‘Power/Comms’ end-cap into the SEP housing. Make certain both holes
for the button head screws align with the hardened stainless steel inserts in the end of the SEP
housing.
9. Make certain there are no trapped wires and press the end-cap home. Twist the end-cap
slightly if necessary to achieve perfect alignment of the screw holes. As you replace the end-
cap, the SEP housing may become slightly pressurised which may make the cap difficult to
replace.
Do not apply excessive force.
10. Insert the four M4 × 12mm A4 stainless steel screws and use the 3mm hexagonal key to
tighten them evenly. Insert both button head screws and tighten them lightly.
2.3.4 Sensing Coils
Each coil triad includes three identical but electrically independent sensing coils aligned mutually at
right angles and supported in a purpose-designed mounting block. You
must
connect these coils
correctly to their respective channels on the SEP.
Two cables are supplied for connecting the coils to the SEP. Each cable has a sealed junction block
and three short tails terminated with 8-way right-angled connectors that attach to the coils. Labels
identify the three tails and help you to connect them to the appropriate sensing coil. The cables are
identical and interchangeable. The junction block has holes that you should use to attach the block to
the coil mounting bar on the ROV.
There are two 12-way ports on the SEP that accept the connectors of the coil cables. A label on the
SEP end cap identifies which is port and which is starboard.
Signal levels detected by the sensing coils may be extremely low (less than 5µV). You must therefore
take care to establish good cable connections when you install the system.
NOTE
Route the cables from the coils to the SEP by securing them along the ROV body
using cable clips. Avoid introducing any sharp bends or other points of stress, and
ensure that the cables are safe from potential damage from manipulators, thrust-
ers or other equipment on the ROV.
