
4 – Electrical Installation
DPN 402197 © TSS (International) Ltd Page 7 of 18
*Refer to sub-section 4.2.2 for details of the communication connections.
Lay the Power and Communications cable from the ROV electrical distribution system
to the SEP. Route the cable along fixed ROV frame members and use cable clips to
secure it at regular intervals. Avoid applying any sharp bends or other points of
mechanical stress along the cable.
Follow the important advice listed in sub-section 4.1.2 concerning the care of connec-
tors.
Connect the Power and Communications cable to the 8-way male ‘Power/Comms’
port on the SEP. Tighten the knurled locking collar by hand only. Do not over tighten
this connector.
CAUTION
It is very important to provide a good ground connection on pin number 2 of the cable.
A poor or a missing connection will severely degrade the performance of the 350 Sys-
tem.
You must make all connections to the ROV using waterproof connectors or splices of
good quality.
4.1.4 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.
TSS supplies two cables that you must use to connect 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 inter-
changeable.
Table 4–1: Power and Communications cable
Connector Pin Number
(and Wire number)
Function Core colours
1 (N) Supply neutral line/L2 Blue
2 (E) ROV ground (refer to sub-section 4.1.1) Green/Yellow
3 (L) Supply 110V live/L1 Brown
Pin 4 (wire number 1) Comms 1 Orange
Pin 5 (wire number 2) Comms 2 White
Pin 6 (wire number 3) Comms 3 Red
Pin 7 (wire number 4) Comms 4 Yellow
Pin 8 (no connection) Spare – Linked internally to the cable screen –
(wire identity S) Link this wire to the cable screen Green
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