15
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.
Analog input
Signal
Type
of
input
signal
Terminal
number
on
SPU3
Backplane-
‘X’
Auxiliary power 1
4
–20mA - active
Terminal nr. X1 and X2
Auxiliary power 2
4
–20mA - active
Terminal nr. X3 and X4
Auxiliary power …
4
–20mA - active
Terminal nr. X… and 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.
Modbus input
Signal
Type
of
input
signal
Terminal number on SPU3
Auxiliary power 1
Modbus
Terminal nr. J1 (see section 6.12)
Auxiliary power 2
Modbus
Terminal nr. J2 (see section 6.12)
Auxiliary power …
Modbus
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.
Analog input
Signal
Type
of
input
signal
Terminal
number
on
SPU3
Backplane-`X`
Density
4
–20mA - active
Terminal nr. X1 and X2
Temperature
4
–20mA - active
Terminal nr. X3 and X4
Viscosity
4
–20mA - active
Terminal nr. X5 and X6
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.