The generator is designed for use with an external voltage regulator forming part of the GCU. The GCU: - rectifies the output of the pilot exciter, - regulates the excitation current to the main exciter field winding. The IDG generator contains three shielded toroidal current transformers combined into one assembly. These provide outputs proportional to the current in the links connecting the neutral ends of the main stator windings to the neutral terminal. They are designed for use in conjunction with the differential feeder current protection circuit in the GCU. The secondary windings of these transformers are connected to an auxiliary connector. 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 E. IDG Oil System (Ref. Fig. 006)
 (1) IDG Cooling An engine oil cooler located close to the IDG enables IDG oil cooling. The schematic of the IDG oil circuit is shown on figure 
R  **ON A/C 401-499, 
R R  E. IDG Oil System (Ref. Fig. 006A) 
R R R R R  (1) Engine fuel/oil cooler An engine fuel/oil cooler cools the IDG oil and limits the IDG inlet temperature to 127 deg.C. Engine oil and IDG oil both go through the fuel/oil cooler but do not mix. 
R R  NOTE : The normal IDG oil inlet temperature is between 40 deg.C to____ 105 deg.C 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (2) IDG oil system operation The IDG has a self contained oil system except for the heat-exchanger. Positive displacement scavenge pumps deliver the oil (via the IDG filter) to the aircraft heat exchanger and return it to the IDG.

 IDG System - IDG Hydraulic Schematic
 Figure 006

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-21-00Page 17 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

R  IDG System - IDG Hydraulic Schematic 
R  Figure 006A 
R 1EFF :  401-499,  1  24-21-00 Page 18 
1  1  Aug 01/05
 1  1
 1CES  1

 The charge oil supply of cleaned, cooled deaerated oil is provided as
 a bus.
 This oil supply feeds :
 - the differential hydraulic units
 - the generator
 - the governor
 - the control piston
 The lubrication jets are individually supplied.
 The dearator supercharges the inlet of the charge pump with solid
 oil.
 The charge pump pressurizes the oil against the charge relief valve.
 It provides thus regulated supply pressures to :
 - the hydraulics
 - the controls
 - the differential
 - the generator
 - the various lubrication and cooling nozzles.
 (3) Oil filter differential pressure indicator
 There is a differential pressure indicator to show when the filter
 element is clogged. The sensing device for the differential pressure
 is automatically neutralized during cold oil running conditions: this
 avoids spurious indications due to high oil viscosity. Similarly, a
 cooler by-pass valve is fitted in the IDG.
 When pressure rises, the valve opens so the cooler is by-passed
 during cold oil operation.
 A scavenge pump relief valve limits the supply pressure of the
 scavenge system.
 A vent valve releases internal case pressure if necessary. 
R  **ON A/C 401-499, 
R  (2) IDG cooling and lubrication system operation 
R 
R  The oil enters the IDG at the opposite side of the drive end through 
R  the input (I/P) filter and is ported to: 
R  - the differential gear, 
R  - input seal, 
R  - charge pump, 
R  - generator stator and rotor. 
R 
R  The oil supplied to the differential gear is also used to spray cool 
R  the PMG stator and lube the disconnect spline. 
R  The input housing has rectangular grooves cut around the main 
R  generator stator core in which oil flows to cool the stator and 
R  maintain a lower IDG surface temperature.

R  The charge pump draws in the oil flow at its suction port and 
R  intensifies its pressure. 
R 
R  The charge oil is then used: 
R  - as a motive flow in the hydraulic and control system, 
R  - for cooling and lubrication of the hydraulic parts. 
R 
R  The oil entering the rotor is distributed for cooling at level of: 
R  - the exciter and main generator rotors, 
　
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