DCS: Mirage F1 Flight Manual
Version 1.0
19
3.2 ELECTRICAL SYSTEM
Description
The electrical system consists of:
-
Two 15 kVA three phase alternators at 400 Hz and 115/200 V AC
-
Two 100 A transformers-rectifiers (TR)
-
One 40 Ah battery.
-
A static inverter
-
A switching box that enables to supply an emergency AC system by the alternators or
the DC system through the static inverter.
-
A standby receptacle that enables certain equipment to be energized and preheated on
the ground.
-
An external AC power receptacle to supply the systems from an auxiliary power unit.
The electrical power is distributed by:
-
AC system 1, normally supplied by alternator 1
-
AC system 2, normally supplied by alternator 2
-
Emergency AC system, normally supplied by alternator 1
-
DC system, normally supplied by the TR’s and the battery. It comprises:
o
a direct battery system
o
a main system
o
a utility subsystem, with automatic shedding in case of both alternators failure.
There are three missile busses, shedding occurs if an alternator fails and RPM are < 5600.
See limitations chapter regarding alternators ventilation.
Operation
When there is undervoltage detection in AC system 1, the emergency AC system is switched to
the inverter. The EMG~ light is on.
When the standby receptacle is connected, the battery and the distribution systems are isolated.
During start, the cranking and ignition of the engine are electrically accomplished on the battery.
After starting, the alternators cut in when they reach their frequency and voltage thresholds,
this happens at approximately 2800 engine RPM.
The inverter selector is set to RESET, switching the emergency AC system to system 1. The EMG~
light goes out.
As soon as the alternators cut in, the standby receptacle disconnects and the aircraft is supplied
normally.
When the external power receptacle is connected, the alternators are isolated (battery switch
ON, light is out) and the two AC systems are supplied.
The external power has priority over the alternators.
There is no external DC power receptacle, since the aircraft is equipped with transformer-
rectifiers.
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