FES Maintenance manual, v1.16 May 2020
Page 10 of 24
3.2.5 Wiring
FES wiring consists of:
1. POWER CABLES
−
For power cables, we use high-quality Betatherm 155 wires with a cross-section of
35 sqmm.
−
On the end of power wires, suitable cable shoes and Radsok power connectors are
pressed and soldered.
2. SIGNAL CABLES
−
We use high quality tinned and shielded wires in signal cables.
−
Signal wires are soldered to multipole DB9 or DB15 connectors on one side and
directly to the circuit board inside the FCC box on the other.
3. 12 V WIRES
−
We use aviation grade Spec 55 wires for all 12V circuits.
−
12 V circuits are equipped with cable shoes.
4. DIFFERENT TYPES OF CONNECTORS
3.2.6 Other components
DC/DC converter
converts high voltage from FES battery packs to 12 V, which supplies
the instruments and the main contactor. It also charges 12 V battery if installed.
The main contactor
connects and disconnects the FES battery packs to the motor
controller. A pre-charge resistor is also installed.
The motor controller
converts high voltage DC to three-phase AC voltage, which it
feeds to the motor. It also sends RPM and controller temperature by the CAN bus to the
Flight Control Unit (FCU) instrument.
Ventilators
provide cooling to the motor controller.
The power switch
provides 12V power to the main contactor and the motor controller
electronic circuit board.
The BMS
in each battery pack controls charging and cell balancing. It can be connected
to a PC with a special cable to monitor the charging process with the BMS Control
software. During the flight, BMS sends temperature and individual cell voltage data to the
FCU instrument.
A shunt
measures current from Battery packs.
The LXUI box
converts analogue current and voltage measurement signals to a digital
signal, which is sent over the CAN bus to the FCU instrument.
