VideoRay Defender MSS, Operator'S Manual

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The strain relief system includes a carabineer that could get hooked on something underwater and
cause the ROV to become trapped. To avoid this possibility, tape over the carabineer with electrical or
duct tape.
The tether connectors should be kept clean to avoid abrasion and corrosion on the
electrical contacts and damage to the rubber insulation. Tether connectors should not be lubricated
with petroleum products or grease. Petroleum will degrade the rubber and grease will attract dirt and
lead to abrasion and corrosion. VideoRay recommends lubricating the tether connectors with pure
silicone spray.
Tether Specifications
Tether Diameter
Units \ Type Negative Neutral Performance
mm 8.51 +/- 0.38 11.18 +/- 0.50 8.18 +/- 0.50
inches 0.335 +/- 0.015 0.440 +/- 0.020 0.322 +/- 0.020
New tether was introduced in 2018. These tethers include a braided Kevlar around the conductors, are
slightly different diameter and can be identified by an "FB" code printed on the tether.
Units \ Type FB Neutral FB Performance
mm 12.2 +/- 0.25 9.1 +/- 0.25
inches 0.440 +/- 0.010 0.358 +/- 0.010
Minimum Tether Bend Radius
Units \ Type Negative Neutral Performance
mm 88.9 114 82.5
inches 3.5 4.5 3.25
Tether Connector Pin Configuration
Tether pin numbering in the connector is shown above. When looking at the mating surface of the
connector, Pin 1 is the offset pin / socket. For male connectors, pins 2-8 proceed in a clockwise
direction. For female connectors, sockets 2-8 proceed in a counter-clockwise direction.
Tether Pin Function and Conductor Wire Gauge
Pin Function Negative Neutral Performance
1 Interlock (GND) 24 24 28