ITW GSE 4400 Tier 4, Руководство пользователя, Страница: 22 / 126

Operation Manual - ITW GSE 4400 Tier 4
d) Warnings/Faults
The control system reacts appropriately to different detected issues. These types can be generalized
between warnings and faults. Warnings are given when the system is able to function but requires
servicing/user interaction. Faults are generated when the unit cannot or should not supply regulated
power to the aircraft.
All faults prevent the engine from starting. However, they react differently to an operating unit. Faults
can be categorized into three subcategories as defined by the fault number.

Fault numbers less than 6000
o
Minor faults: Will disconnect power to the aircraft but not affect engine and generator
functions.

Fault numbers between 6000 and 8000
o
Mid-level faults: Will disconnect power to the aircraft, turn off the generator and shut
down the engine after the required 30 second cool down.

Fault numbers greater than 8000
o
Major faults: Result in immediate shutdown of all system components including the
engine. Service is required on the unit before it is returned to operation.
Engine generated warnings and faults are also monitored and their respective Cummins fault
numbers are shown on the display.
e) Generator
The 400 Hz generator is a brushless, dual bearing, revolving field, three-phase, alternating current
type unit. The front end of the rotor shaft extends forward beyond the front bearing and is coupled to
the engine flywheel by a flexible coupling assembly. The rear end of the rotor shaft extends rearward
beyond the rear bearing and into the exciter stator housing. The exciter rotor is mounted on this shaft
extension with a key and is secured by a washer and 1/2-13 threaded cap screw.
The rectifier has six diodes mounted on the exciter rotor and converts exciter AC output to DC for
excitation of the generator revolving fields. The exciter outputs DC to the generator fields, and
consequently the generator output is controlled by the voltage regulator PC board (REG). A
centrifugal, radial-blade fan draws cooling air over all internal windings. Air enters at the exciter end
and is discharged at the drive end. The complete generator assembly is bolted to the engine’s
flywheel and housing.
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