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MSS
Operator's Manual, 1.00.00
Tether
Tether connects the ROV to the surface and provides power, communications, video and an APIC
(Auxiliary Pair of Independent Conductors) for accessory use. The tether consists of conductors, a
®
Kevlar
strength member, flotation (for Neutral and Performance tethers) and an outer jacket. It is
available three types: Negative, Neutral and Performance (often called PPT), and can be purchased in
standard and custom lengths. Neutral and Performance are neutrally buoyant in fresh water because
they have a specially designed foam jacket.
While larger conductors provide the best power transmission capacity, they lead to thicker tethers,
which results in higher drag. Negative tether has the largest conductors (best power transmission
capacity), followed by Neutral, and then Performance. Negative and Performance tether have the
smallest diameter (least drag), while Neutral tether has the largest diameter.
The tether connectors are wet mateable and can be connected while they are wet. One of the pins in
the connector is offset. To connect the tether to the ROV, control panel or another tether, align the
offset pin of the connectors and press the two connectors together until the base surface of each
connector are touching each other. Then, connect the tether locking sleeves by screwing them
together to secure the connection.
Multiple tethers can be connected in series like conventional power extension cords. See the
Tether
Management
section of the
Operations Guide
for recommended tether configurations.
Always secure the tether connectors using the locking sleeves and strain relief system to
avoid separation and loss of the ROV.
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