Consilium SAL R1a Speed Log ELC (Main Unit / Electronics Board, Part No. 703800)

The Consilium SAL R1a ELC (Electronic Cabinet / Main Unit, Part No. 703800) is the core processing and interface unit for the Consilium SAL R1a Acoustic Correlation Speed Log System. It processes signals received from the underwater acoustic transducer (TRU) to calculate speed through water (STW) and distance traveled, distributing data to bridge repeaters, radar, and ECDIS systems.

Key Specifications & ArchitectureParameterTechnical SpecificationSystem ModelConsilium SAL R1a Speed and Distance Measuring DeviceAssembly Part Number703800 (ELC Main Cabinet / Electronics Assembly)Main Processing BoardSAL R1a PCBU (Water Track Unit - WTU, typically P/N 703809)Measuring PrincipleAcoustic Correlation (3.8 MHz / 4.2 MHz / 4.0 MHz)Speed Range$\\pm 50\\text{ knots}$ sensed speedAccuracySpeed: Better than 1% or $0.1\\text{ knots}$; Distance: Better than 1%Operating Voltage115 VAC / 230 VAC ($\\pm 10\\%$, 50–60 Hz); optional 12 VDC auxiliary supplyPower Consumption~30 VA nominalEnclosure Rating & DimensionsIP66 steel wall-mount cabinet; $360 \\times 360 \\times 170\\text{ mm}$; approx. $10.5\\text{ kg}$Internal Sub-Assemblies & Functions

• Water Track Unit (WTU / PCBU 703809): Carries out high-speed digital signal processing on acoustic echoes returned from water particles to determine forward/reverse vessel speed.

• Power Supply Section: Accepts dual AC mains ($115\\text{ VAC} / 230\\text{ VAC}$) and generates internal DC operating rails, plus a 24 VDC auxiliary output designed to power up to three external SD-series display units.

• Transducer Interface: Dedicated connection terminal for the TRU transducer cable (standard 30-meter or optional 40-meter factory cable).