Rolls-Royce AIU-3 Controller Module

The Rolls-Royce AIU-3 (Analog Interface Unit / Analog Input Controller Module) is an automation module developed by Rolls-Royce Marine (Aquamaster Rauma / Kamewa). Engineered specifically for marine propulsion control cubicles, the AIU-3 acts as the critical bridge between field instrumentation (feedback potentiometers, angle transmitters, hydraulic pressure transmitters, tachometers) and the master propulsion processor.

Operating in azimuth thrusters and steerable propulsion packages, the AIU-3 digitizes high-precision analog signals, executes local filtering, and communicates azimuth positioning, clutch, and pitch feedback directly to thruster control cabinets (such as the Aquamaster Micropilot and Ulstein-heritage systems). The module incorporates galvanic channel-to-channel isolation, transient overvoltage suppression, and fault-tolerant rail protection to ensure zero drift during dynamic positioning (DP) and maneuvering regimes.

Model Details

• Manufacturer: Rolls-Royce
• Model Identifier: AIU-3 (Analog Input / Interface Unit 3)
• Primary MPN: 7030008
• Hardware Revision / Sub-Assembly: 1V69 / AIU3-1V69
• Alternate Cross-References:
  • Aquamaster Rauma 7030008-1V69
  • Rolls-Royce Marine AIU-3 / AIU3
  • Kongsberg Marine Spare P/N: RR-7030008
  • Kamewa Thruster Interface Card AIU-3

Technical Specifications

Equipment Compatibility

• Rolls-Royce Aquamaster Azimuthing Thrusters: US series (US 205, US 255, US 305, US 355, US 601, and CP/FP variants).
• Kamewa Ulstein Propulsion Units: Tunnel thrusters (TT series), Retractable thrusters (UL series), and Controllable Pitch Propeller (CPP) hydraulic control racks.
• Integrated Control Panels: Aquamaster Rauma MicroPilot series, Compact Steering Cabinets, and Rolls-Royce Common Platform Marine automation racks.

Key Features

1. High-Precision Signal Conditioning: 16-bit analog-to-digital conversion provides drift-free position resolution down to 0.05 degrees of azimuth angle.
2. Industrial Galvanic Isolation: 1,500 V optical/galvanic barriers decouple field noise from the sensitive core controller architecture, preventing common-mode ground loop failures.
3. Continuous Wire-Break & Ground Fault Detection: Embedded diagnostics detect and signal open circuit, short circuits, and ground fault conditions across all sensor loops.
4. Dual Power Input Redundancy: Automatic seamless switchover between Main and Auxiliary 24 VDC power buses without interruption to thruster control operation.
5. Rugged Marine-Grade Construction: Conformal-coated circuit assemblies withstand salt spray, continuous high-vibration engine-room environments, and extreme thermal swings.

Applications

• Marine Azimuth Steering Angle Feedback Systems (Potentiometer & RVDT interfaces)
• Dynamic Positioning (DP-1, DP-2, DP-3) Thruster Interface Cubicles
• Controllable Pitch Propeller (CPP) Blade Angle & Pitch Actuator Monitoring
• Main Steering Gear Hydraulic Servo-Valve Proportional Feedback
• Tugboat, Anchor Handling Tug Supply (AHTS), and Platform Supply Vessel (PSV) Main Propulsion Automation

Frequently Asked Questions

What is the function of the Rolls-Royce AIU-3 Controller Module?

The AIU-3 (Analog Interface Unit) processes, conditions, and digitizes analog signals from sensors—such as rudder/steering angle potentiometers, hydraulic pressure sensors, and temperature probes—and feeds real-time telemetry to Rolls-Royce, Aquamaster, and Kamewa propulsion control computers.

Can the AIU-3 module replace an AIU-1 or AIU-2 board directly?

In most Aquamaster Rauma control racks, the AIU-3 serves as a backward-compatible replacement for earlier AIU revisions. However, terminal configurations and hardware jumper settings must be aligned to match earlier wiring looms. Verify firmware compatibility on the master CPU rack prior to hot-swapping.

What does the Part Number 7030008 1V69 indicate?

Part number 7030008 is the proprietary OEM production code for the AIU-3 assembly used by Aquamaster Rauma and Rolls-Royce Marine. The “1V69” designation denotes the hardware revision and component layout of the PCB.

How do I troubleshoot an illuminated red or amber LED on the AIU-3?

An illuminated error LED indicates an open-circuit loop condition, a short-circuit to chassis ground, or supply voltage dropping below 18 VDC. Use a multimeter to verify 24 VDC at TB1 and ensure the 4–20 mA loop current across the active channel terminals falls between 4.0 mA and 20.0 mA.

Are reconditioned Rolls-Royce AIU-3 units load tested prior to dispatch?

Yes. Every reconditioned AIU-3 module undergoes bench testing on a dedicated marine simulator. The analog inputs are verified across dynamic 0–100% signal sweeps, thermal cycle testing is conducted inside an environmental test chamber, and communication data integrity is logged under synthetic bus loads before release.