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6.9 ANALOGUE OR MODBUS INPUT FOR AUXILIARY POWER
When Auxiliary Engines (AE) are monitored by VAF PT2 flow meters, it is possible to measure the
Specific Fuel Oil Consumption (SFOC) of the AE driving the generators.
In order to measure the electric power supplied by the generators to the boardnet, 4–20mA signals or
Modbus signals representing the power level of the generators can be connected to an input inside of
the SPU3. A maximum of 6 AE’s can be connected.
A maximum of 6 input signals (4–20mA or Modbus) can be connected to the SPU3 representing the AE’s
power level.
Terminal number on SPU3
Backplane-‘X’
The number of Backplane-“X” might differ per PEM4 configuration, depending on the total
system. Please refer to the connection diagram what comes with the project.
Terminal nr. J1 (see section 6.12)
Terminal nr. J2 (see section 6.12)
Terminal nr. J1 (see section 6.12)
6.10 ANALOGUE INPUT FOR VISCOSENSE
®
3D – DENSITY, TEMP. AND VISCOSITY
A ViscoSense
®
3D can be connected to the SPU3. Therefore the 4–20mA output signals of the
ViscoSense
®
3D interface box, density, temperature and viscosity, will be connected to the analogue input
inside of the SPU3.
Using the density and temperature input the mass flow within the fuel system can be calculated and be
shown on the PEM4 screen.
Because the ViscoSense
®
3D measurement and the volume flow measurement possibly have different
temperatures, both measurements (mass and volume) will be calculated at reference temperature and
accordingly be multiplied with each other to get the mass flow.
Terminal number on SPU3
Backplane-`X`
The number of Backplane-“X” might differ per PEM4 configuration, depending on the total
system. Please refer to the connection diagram what comes with the project.
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