The FMPC-V2 is an electronic control system (composed of HW and SW parts developed by UNIS company) and together with the brushless DC motor, hydraulic pump and 3-wave solenoid valve presents the FMP (Fuel Metering Pump). The FMP is a part of the APU fuel system and its main function consists in feeding the gas generator nozzles of the APU with the required fuel flow and pressure to guarantee a constant turbine speed.
The FMPC-V2 is powered from the 28V primary and secondary on-board systems. The FMPC-V2 is controlled through the START/STOP digital input, RS-422 serial interface or by an analogue input signal for setting up the required fuel flow. The primary function of the FMPC-V2 is to control a sixpole 3-phase brushless DC motor; furthermore, it provides fuel temperature monitoring at the pump inlet, the current consumption, the temperature of power bridge transistors, the supply voltage level.
The FMPC-V2’s control SW was developed in accordancewith the document RTCA DO178B level B.