Rolls-Royce R984672B Voltage Transmitter Assembly
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Rolls-Royce R984672B Voltage Transmitter Assembly
The Rolls-Royce R984672B Voltage Transmitter Assembly is an electro-hydraulic and electromechanical feedback instrumentation unit designed for marine propulsion control systems. Primarily integrated into Rolls-Royce Kamewa waterjets, steering deflectors, reversing buckets, and controllable pitch propeller (CPP) systems, the R984672B converts mechanical feedback displacements or remote potentiometric input signals into a stable, noise-immune DC voltage/current reference signal.
Technical Details:
| Parameter / Specification | Engineering Rating / Technical Value |
|---|---|
| Manufacturer / Brand | Rolls-Royce Marine (Legacy) / Kongsberg Maritime |
| Manufacturer Part Number (MPN) | R984672B |
| Equipment Classification | Transmitter Assembly / Positional Feedback Voltage Transducer |
| Nominal Supply Voltage | 24 VDC (Nominal, polarity-protected) |
| Operating Voltage Range | 18.0 VDC to 32.0 VDC (Residual ripple < 5%) |
| Signal Input Type | Precision angular/linear potentiometric feedback (1 kΩ to 5 kΩ standard bridge) |
| Signal Output Range | 0 to 10 VDC / ±10 VDC bipolar (configurable auxiliary 4–20 mA loop) |
| Measurement Linearity & Accuracy | ≤ ±0.25% Full Scale (FS) |
| Temperature Drift | ≤ 0.015% FS / °C |
| Isolation Voltage | 1.5 kVAC RMS between supply, input, and signal output circuits |
| Terminal Block Configuration | Screw-clamp cage terminals; 0.5 mm² to 2.5 mm² (AWG 20–14) |
| Cable Gland Entries | M20 × 1.5 threaded entries for shielded marine multi-core cabling |
| Operating Temperature | -25°C to +70°C |
| Ingress Protection (IP Rating) | IP66 (Dust-tight and protected against high-pressure water jets) |
| Vibration Compliance | IACS UR E10, 0.7 g (2.0 to 13.2 Hz), 1.0 g (13.2 to 100 Hz) |
Frequently Asked Questions
What is the primary function of the Rolls-Royce R984672B?
The R984672B functions as an instrumentation bridge and voltage transmitter assembly. It captures mechanical stroke or angular position from jet propulsion deflectors or CPP systems and translates it into a standardized voltage reference for automated ship control systems.
Is the R984672B interchangeable with the R984672C?
Yes. Revision C (R984672C) is a direct functional and form-fit replacement for Revision B (R984672B). Both units share the same mounting pitch, terminal block pin assignments, input drive shaft specifications, and supply voltage ranges.
How is the zero/span calibration executed on this assembly?
The unit includes internal multi-turn trimpots labeled ZERO and SPAN. With the mechanical link pinned at neutral, adjust ZERO to achieve the baseline output. Then cycle the actuator to maximum deflection and turn SPAN until the output matches full-scale voltage (e.g., +10.0 VDC).
What checks are performed on reconditioned units prior to dispatch?
Every reconditioned unit undergoes an insulation resistance test (Megger), a multi-point linearity sweep from 0% to 100% stroke, a 24-hour thermal soak run under electrical load, and housing vacuum testing to verify IP66 water-tightness.
Can this transmitter run on a 12V DC power bus?
While certain versions can tolerate voltages down to 18 VDC, standard marine control loops require nominal 24 VDC. Operating below 18 VDC degrades internal voltage regulators and compromises signal linearity under load. Use a clean, isolated 24 VDC industrial power converter.
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