4.
Intr
odu
ction
Introduction
The Compac C4000 BioBlend controller has been specifically adapted to enable the dispensing
of customised mixtures of diesel and bio-diesel fuels.
Using two pumps and solenoids, bio-diesel and diesel are drawn from their respective tanks and
blended at a ratio of between 20% to 40% bio-diesel to diesel in 5% increments.
The blend can be selected in two ways:
1) Static Blend. This is set in the C4000 using the parameter switch menu and is used for stand
alone pumps with no fuel management system connected. Blend ratios in 5% increments from
B20 (20% bio-fuel) to B40 (40% bio-fuel).
2) Dynamic Blend. The blend ratio is set on each fuel card and sent from the ComFMS board to
the C4000. Gradients in 5% can be set from B20 (20%) to B40 (40%).
The system works by turning on both pump motors and then pulsing the primary and secondary
solenoids of the bio-fuel circuit to achieve the correct blend ratio. Two meters are used, one for
each fuel. The combined total of fuel delivered through both meters is displayed on the main
pump display.
The total flow rate of the pump will vary depending on the blend selected. At a low ratio of bio-
fuel the flow rate will be lower as the majority of the blend will be supplied by the diesel pump
and motor. As the ratio of bio-diesel increases, the total flow rate will increase as the flow will
be a combination of both pumps and motors.
NOTE:
The pump is designed to dispense mineral diesel with the addition of bio-diesel. It is not
designed to dispense 100% bio-diesel if the mineral diesel tank is empty. Meter errors and fuel
overflow through the air eliminator may occur if this is attempted.
Software Requirements
For the system to operate correctly special software must be used in the C4000 processor board
and the ComFMS board if applicable. The blend percentage can only be controlled through a
Compac fuel management system, it is not able to be controlled by a 3rd party system.
Software versions are:
C4000: HIA29253_BLEND
ComFMS: EAB01828_BLEND
