A-TECH ATW-02T Marine Winch

A-TECH CO. ATW-02T Marine Electro-Mechanical Winch

The A-TECH CO. ATW-02T is an electro-mechanical utility and survey winch engineered for demanding vessel deck installations, hydrographic surveying, ROV umbilical handling, and offshore tether management. Operating with an active line pull rating of 20 kN (2.0 metric tons) on the first layer, the ATW-02T integrates a high-torque, marine-duty squirrel-cage induction motor with a multi-stage planetary gearbox and an electro-magnetic failsafe disc brake.

Housed in a ruggedized, hot-dip galvanized structural carbon steel frame coated with a C5-M marine epoxy barrier, the ATW-02T delivers corrosion resistance against continuous salt-spray, green water impact, and washdown cycles. The winch is equipped with an integrated level-wind diamond-screw spooling gear, an absolute optical encoder for precise pay-out/haul-in wire telemetry, and an isolated junction interface supporting dual-channel remote and local pendant operation.

Model Details

• Manufacturer: A-TECH CO., LTD.
• Model: ATW-02T
• Manufacturer Part Number (MPN): ATW-02T-440-3P60-BRK
• Product Series: ATW Utility & Survey Drum Handling Series

Technical Details

Key Features

1. Heavy-Duty 20 kN Pull Force: Delivers a rated line pull of 20 kN (bare drum) and 14 kN (full drum) with stepless variable frequency drive (VFD) speed regulation up to 35 m/min.
2. Fail-Safe Electro-Magnetic Braking: Spring-applied, electrically released multi-disc holding brake rated at 150% static line load (30 kN holding capacity), ensuring zero slip upon emergency stops or auxiliary bus blackout.
3. Synchronized Diamond-Screw Level Wind: Mechanically coupled, bi-directional diamond-bar spooling arm ensures uniform layer wrapping across multi-layer drum windings, eliminating cable biting and premature sheath fatigue.
4. C5-M Harsh Environment Enclosure: Marine epoxy coated welded frame (minimum 320 µm DFT) with 316L stainless steel hardware, shafts, and grease-purged IP56/IP66 enclosures for open deck installations.
5. Industrial PLC & Slip Ring Compatibility: Integrated high-accuracy line counter telemetry (pulse output) and modular junction enclosure compatible with fiber-optic rotary joints (FORJ) and copper slip rings for live instrument/umbilical deployment.

Winch Compatibility

• Frequency Converters / VFD Drives: Fully compatible with marine-type inverters including ABB ACS880 Marine Drive, Danfoss VLT AutomationDrive FC 302, Siemens SINAMICS S120/G120D, and Schneider Altivar Process ATV900 series.
• Control Systems: Compatible with Allen-Bradley ControlLogix/CompactLogix, Siemens S7-1200/1500, Kongsberg K-Pos DP integrations, and standard NMEA-0183/2000 payout logging units.
• Rotary Slip Rings: Factory-machined shaft ends pre-drilled to mount standard slip rings: Moog Focal Model 180 / Model 228, Trolex TX series, or Mercotac high-current/signal slip rings.
• Vessel Classes: Workboats, Anchor Handling Tug Supply (AHTS) vessels, research and survey catamarans, DP-2 offshore support vessels (OSV), naval support ships, and oceanographic barges.

Part Number Cross-References

• A-TECH CO.: ATW-02T | ATW02T-440 | ATW-02T-REV-B
• Ashtead Tech Reference: ATW-2 / ATW-2F Series
• Equivalent Aftermarket References: MAC-02-ELW-440V, RMW-2000-E440, OSW-20KN-VFD

Applications

• Oceanographic & Hydrographic Survey: Deployment of towed sensor arrays, side-scan sonars, sub-bottom profilers, magnetometer arrays, and ocean CTD water samplers.
• ROV / Subsea Tether Deployment: Mid-depth deployment and handling of inspection-class Remotely Operated Vehicles (ROVs), underwater drop-cameras, and dive intervention tools.
• Auxiliary Tug & Workboat Operations: General deck mooring, workboat tugger operations, line handling on supply barges, and auxiliary positioning.
• Environmental & Marine Research: Continuous sediment grab sampling, trawl sonde towing, benthic sled pulling, and water-column profiling.

Frequently Asked Questions

What is the maximum holding capacity of the A-TECH ATW-02T winch?

The ATW-02T features a mechanical spring-set electro-magnetic disc brake that provides a static holding capacity of 30 kN (3,059 kgf), delivering a 150% safety factor over the rated first-layer pull load of 20 kN.

Can the ATW-02T winch be integrated with a vessel Dynamic Positioning (DP) or remote survey suite?

Yes. The terminal control block (TB3/TB4) provides integrated interfaces for isolated 4–20 mA or 0–10V speed/torque commands, alongside dual-channel quadrature encoder outputs for real-time monitoring of cable pay-out distance, line speed, and fault signaling to vessel bridge monitoring stations.

What electrical power supply is required on deck for the ATW-02T?

The winch operates on standard marine 3-phase 380V to 440V AC, 50/60 Hz shipboard auxiliary power. A dedicated 50 A to 60 A branch circuit with an upstream motor-rated circuit breaker or motor starter cabinet is recommended.

Can the winch drum accommodate synthetic rope in place of steel wire rope?

Yes, the drum and guide rollers can handle synthetic lines (such as Dyneema or Spectra) as well as steel wire ropes or armored electro-optical umbilicals. However, the level-wind diamond lead screw is pitch-matched to the designated cable diameter; specify the exact line diameter prior to delivery so the factory can fit the matching level-wind drive gear ratio.

How does the emergency stop circuit behave during a total vessel power loss?

The ATW-02T utilizes a fail-safe mechanical brake assembly. In the event of an emergency stop activation, control loop failure, or sudden total black-out of the shipboard main bus, internal mechanical coil springs immediately force the friction discs closed, arresting drum rotation in fractions of a second with zero external power required.