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When an IDG must be disengaged, the IDG button should be pressed and held until the Gen FAULT light comes on, but should not be held for more than 3 seconds. In the event of a generator having out of limit load but continuing to power its AC bus, the amber FAULT light in the GEN button will not illuminate.
Why is the IDG disconnect SW is a guarded switch?
GUARDED – The IDG switch is guarded and normally spring-loaded out. When pushed, the IDG is disconnected from its drive shaft and can only be reconnected by maintenance. FAULT – An amber FAULT light indicates an IDG oil outlet overheat or low oil pressure.
How does an IDG work?
An IDG consists of a Constant Speed Drive (CSD) and AC generator mounted side by side in a single housing assembly. The CSD uses controlled differential action to maintain the constant output speed necessary to power the generator.
What is aircraft IDG?
The IDG(Integrated Drive Generator) is an aircraft power generation device which houses a Continuously Variable Transmission(CVT) to generate 400Hz constant frequency power regardless of the engine speed.
What is the does the IDG disconnect do?
Pressing the IDG disconnect sends a current to a solenoid. A solenoid is “a cylindrical coil of wire acting as a magnet when carrying electric current.” When activated it pulls a pin that is holding another spring loaded pin that engages the disconnect mechanism.
What is the maximum time to depress IDG disconnect switch?
C: Never disconnect an IDG in flight, or push the IDG disconnect push button for more than 5 seconds. D: Never disconnect an IDG unless the engine is running, nor push the IDG disconnect push button for more than 3 seconds.
What is the difference between CSD and IDG?
A unit called a constant-speed drive (CSD) is used to ensure the alternator rotates at the correct speed to ensure a 400-Hz frequency. When the CSD and the alternator are contained within one unit, the assembly is known as an integrated drive generator (IDG).
What is the difference between IDG and VFG?
Variable Frequency Generators (VFG) When the motor speed is too low for the power demand, the output voltage of the generator is decreased. On most types (e.g. A320, A330, B737, B747, B777) an Integrated Drive Generator (IDG) is used.
What happens if you disconnect the IDG on an Airbus A320?
Also it says that not to disconnect it if the engine is not running as if we do and then start the engine it’ll damage the IDG. How does this happen? Pressing the IDG disconnect sends a current to a solenoid.
What happens when you disconnect the solenoid from the engine?
When activated it pulls a pin that is holding another spring loaded pin that engages the disconnect mechanism. Holding it for +3 seconds will overheat and thus destroy the solenoid and will require replacement to be able to use it again. The disconnect mechanism requires a running engine.
What happens when you hit the disconnect button on a generator?
When you press the disconnect button (the red arrow), the disconnect circuit is completed and the solenoid pulls the pin out of the pinion shaft (the blue arrow) which then engages the worm gear on the drive shaft (the green arrow) and causes that gear to disengage from the drive mechanism. This causes the generator to stop turning.