Description
Product Specifications
| Feature | Details |
|---|---|
| Brand | VAF Instruments |
| Model Number | SPU-3 TORQUE MONITORING SYSTEM (154109) |
| Function | Signal Processing Unit for Shaft Power/Torque |
| Country of Origin | Netherlands |
| Weight | Approx. 2.4 kg |
| Dimensions | 200mm x 165mm x 90mm |
| Input Signal | Frequency/Pulse from Optical or Inductive Sensors |
| Output Type | 4-20mA Analog / RS-485 Modbus Digital |
| Power Supply | 115/230V AC or 24V DC (Model specific) |
The VAF SPU-3 (154109) is a specialized Signal Processing Unit designed for precision torque, speed, and power measurement on marine propeller shafts and industrial rotating machinery. This unit acts as the “brain” of the T-Sense torque measuring system, converting raw sensor data into actionable information for fuel efficiency optimization and engine load monitoring. Its robust, vibration-resistant housing and high-speed sampling rates make it a critical component for maritime vessels looking to comply with EEXI/CII regulations and reduce operational carbon footprints through real-time power management.
Q&A: Product Common Issues & Solutions
Q: Why is the SPU-3 showing a “No Signal” alarm even when the shaft is rotating? A: This is usually related to the air gap between the shaft-mounted sensors and the stationary pickup units. If the gap exceeds the technical limit (typically 2-4mm), the SPU-3 cannot detect the pulses. Check for mechanical shifting or debris buildup on the sensor faces. Additionally, verify the integrity of the shielded cabling to ensure no signal interference is occurring.
Q: Can the SPU-3 be calibrated for different shaft diameters? A: The SPU-3 hardware is universal, but the software parameters must be configured with the specific “Shaft Constant” and “Modulus of Rigidity” (G-modulus) of your vessel’s shaft. If these values are entered incorrectly into the system menu, the torque and power readings will be mathematically scaled incorrectly, leading to inaccurate performance data.
Q: What causes erratic or fluctuating power readings on the display? A: Erratic readings are often the result of “electrical noise” from nearby high-power VFDs or poor grounding of the signal cable shield. Ensure the SPU-3 is grounded at a single point and that the sensor cables are not run parallel to high-voltage power lines. In some cases, a failing internal power supply module within the SPU-3 can also cause unstable reference voltages.
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