IDG Location in Nacelle
 Figure 001
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R  IDG System Control - Component Location Figure 002
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 IDG Attachment to the Gearbox
 Figure 003

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R  IDG Attachment to the Gearbox 
R  Figure 003A 
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 3. System Description
__________________
 A. Integrated Drive Generator (IDG)
 The IDG converts variable speed shaft power directly into constant
 frequency 400 Hz AC electrical power.
 This is accomplished by the Constant Speed Drive (CSD) which drives the
 AC generator at constant speed.
 The AC generator produces thus constant frequency power.

 B. Function of the Generator Control Unit (GCU)
 Each GCU controls its dedicated IDG:
 -
IDG 1 : GCU 1,

 -
IDG 2 : GCU 2.

 The main functions for the regulation and protection of the IDG are:
 -
regulation of the generator voltage at Point Of Regulation (POR),

 -
regulation of the generator speed,

 -monitoring and protection of the system.
 C. Function of the IDG Pushbutton Switches
 If an IDG is faulty (overheat or abnormal oil low pressure), the FAULT legend comes on. The pilot must then open the safety guard and push the IDG pushbutton switch. This action results in the mechanical disconnection of the faulty IDG.
 NOTE : With engine stopped, the IDG cannot be disconnected. An underspeed
____ condition generated by the GCU inhibits the disconnection.
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 4. Power Supply
____________
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU ELEC/IDG2/DISC 2XT T25 122VU ELEC/IDG1/DISC 1XT T24
 5. Interface
_________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 004)

R **ON A/C 401-499,
R (Ref. Fig. 004A)

R **ON A/C ALL
 A. Generator Control Unit
 (1) Input data
 Each GCU receives the following signals from its dedicated IDG:
 - oil inlet temperature,
 - oil outlet temperature,

 -low oil pressure,
 -PMG 3 phase output voltage,
 -CT 3 phase signal.
 (2) Output data
 Each GCU provides the following output analog data to the SDACs, through the ARINC 429 link:
 -
IDG oil output temperature,

 -
IDG oil inlet temperature,

 -
AC load at POR,

 -
AC frequency (phase A)

 -
AC voltage (phase A) at POR.

 It provides also to the SDACs the following discrete information
 through ARINC 429 link:
 - overload warning,

 Speed Regulation Loop
 Figure 004

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R  Speed Regulation Loop 
R  Figure 004A 
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 - generator fault, - IDG disconnect status, - IDG disconnect pushbutton position, - IDG oil outlet overheat, - IDG oil low pressure, - GEN pushbutton switch position.
 6. Description___________
 A. Description of the IDG 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 005) 
R  **ON A/C 401-499, 
R  (Ref. Fig. 005A) 
R  **ON A/C ALL
 (1) Electrical circuit
 - hook-up of the electrical wiring, - location of the electrical connectors.
 (2) Maintenance
 - oil replenishing, - oil drainage, - oil level check, - filter, - disconnect reset handle.
 (3) Inspection
 - clogging indicator of the scavenge oil filter on the IDG oil-out line.
　
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