ROV Mounted Camera Winch: Specifications, Wiring & Installation Guide

Overview: What Is an ROV Mounted Camera Winch?

An ROV mounted camera winch is a compact hydraulic reel assembly that integrates directly onto an ROV frame, enabling operators to deploy a camera (or sensor payload) vertically into confined spaces such as risers, J-tubes, flooded compartments, or seabed bore holes without repositioning the ROV itself. The winch spools out a composite cable carrying power, video signal, lighting control, and RS-485 communications, while an internal slip ring maintains continuous electrical continuity across the rotating drum.

This guide covers the full technical specification of a standard ROV-frame-mounted camera winch system, including hydraulic requirements, slip ring wiring, cable depth marking conventions, mechanical dimensions, and installation recommendations.

Key Specifications at a Glance

Hydraulic Drive System

The winch drum is driven by a hydraulic motor coupled through a worm gearbox, providing high torque at low line speeds with inherent load-holding capability. No separate brake is required. The pressure-reducing and check valve arrangement maintains stable drum tension regardless of supply pressure fluctuations from the ROV hydraulic power unit.

Hydraulic Component Overview

Hydraulic Circuit Notes

• The pressure-reducing valve limits peak motor inlet pressure and protects the slip ring assembly from vibration at high RPM.
• The worm gearbox provides self-locking under load, holding the camera payload in position on power loss without operator intervention.
• ROV hydraulic supply is connected via standard SAE face-seal fittings; the return line must be routed to the ROV low-pressure return manifold.
• Recommended flushing procedure: circulate clean filtered hydraulic fluid at minimum flow for 5 minutes before first deployment.

Slip Ring and Signal Interface

A multi-channel IP68-rated rotary slip ring is mounted at the drum axis to transfer all electrical signals continuously as the cable pays out and retrieves. The stainless steel housing is rated for full submersion at ROV working depth.

Slip Ring Technical Data

8-Pin Wiring Map

Cable routing note: The 4 m ROV-to-winch flying lead uses the same 8-conductor pinout. Ensure the video coax is impedance-matched (75 ohm) at all connectors to avoid signal reflections across the 55 m drum cable.

Cable Depth Marking System

The 55 m camera cable incorporates a standardised depth-marking scheme that allows operators to read deployed depth directly from the drum face or via the topside camera view:

• White stripe: Appears every 10 m (at 10, 20, 30, 40, and 50 m marks)
• Green stripe: Appears at the 5 m mid-point between each white stripe (at 5, 15, 25, 35, and 45 m marks)
• No marking: The final 5 m (50 m to 55 m) acts as a mechanical stop buffer and carries no depth stripe

This convention is consistent with standard ROV umbilical depth marking practice, allowing cross-trained operators to read depth without additional instrumentation.

Mechanical and Mounting Dimensions

Frame Integration Guidelines

• The 12 mm base plate is drilled for standard ROV frame bolt patterns; custom drilling is available on request.
• Mount the winch as close to the ROV centre-of-buoyancy as possible to minimise trim change during deployment.
• Allow a minimum 80 mm clearance above the drum for cable egress and a 150 mm radial clear zone around the hydraulic motor body.
• Hydraulic hose routing should avoid chafe points; use bulkhead fittings where hoses pass through frame rails.

Typical Applications

• Riser and J-tube inspection: Deploy the camera vertically from the ROV into flooded risers, J-tubes, or conductor pipes without additional tooling
• Seabed borehole inspection: Lower the camera into bored holes for sediment and structural assessment
• Flooded compartment survey: Inspect confined subsea structures where the ROV body cannot enter
• Pipeline end termination (PLET/PLEM) inspection: Camera on a tether reaches into receptacle bores for visual confirmation of seal condition
• Mooring chain and stud link examination: Deploy laterally alongside mooring legs for close-range visual inspection

Cable and Connector Compatibility

The winch is designed around a composite camera cable consisting of a central coaxial video core surrounded by eight individually screened conductors, all within a single PU or LDPE outer jacket. RV Power Group supplies compatible subsea cable assemblies and wet-mate connectors for camera winch applications.

• Composite cable OD: typically 8 to 10 mm depending on conductor CSA and jacket wall
• Minimum bend radius on drum: 6x cable OD (maintained by drum geometry)
• Connector interfaces: 8-pin and coax bulkhead connectors available in titanium and 316L stainless steel
• Custom cable lengths (up to 100 m) and multi-core counts available on request