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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-101
Generator Control Breaker (GCB) - Manual Close
The generator control unit for IDG 1 (GCU 1) sends a close
command to generator control breaker 1 (GCB 1) when all of
these conditions occur:
* Control switch 1 temporarily goes to the ON position
* Fire switch is in the normal position
* Power quality is OK
* GCU has a ready to load (RTL) signal from the display
electronics units (DEUs) or IDG power quality is good for 20
seconds
* Bus tie breaker 1 (BTB 1) is open.
The GCU receives the RTL signal when the engine is at or
above idle speed and the engine start lever is in the idle
position.
The BTB receives an open (trip) signal from the GCU when the
IDG power quality is good (GCR in closed position) and you put
the generator control switch to the ON position. The GCU
monitors BTB position and closes the GCB only after BTB 1
opens.
GCB - Automatic Close
GCU 1 also sends a close command to the GCB 1 when all of
these conditions occur:
* Fire switch is in the normal position
* BTB 1 is open
* Airplane is in the AIR mode
* GCB is open on transition to the AIR mode and the APU is
the only source of power on the aircraft (GCB 2 is also open)
* Auxiliary power breaker (APB) opens.
This occurs only once in flight. The circuit gets reset on
transition to the GND mode.
GCB - Open
GCU 1 sends an open command to the GCB 1 when any of these
conditions occur:
* GCU sees an underspeed condition (engine shut down)
* Engine fire switch is in the FIRE position
* Power quality is out of limits
* Generator control switch 1 goes temporarily to the OFF
position
* GCU 1 receives an open (trip) command from the BPCU.
AC GENERATION - GCU - GENERATOR CONTROL BREAKER (GCB) CONTROL
EFFECTIVITY
GUN ALL 24-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-102
AC GENERATION - GCU - GENERATOR CONTROL BREAKER (GCB) CONTROL
AC GENERATION - GCU - GENERATOR CONTROL BREAKER (GCB) CONTROL
EFFECTIVITY
GUN ALL 24-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-102
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AC GENERATION - GCU - GENERATOR CONTROL BREAKER (GCB) CONTROL
24-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Generator Excitation
The IDG has a constant speed drive and a brushless AC
generator.
The constant speed drive (CSD) is a hydromechanical device
that adds or subtracts the variable input speed of the engine
accessory gearbox. This operation keeps a constant output
shaft speed necessary to turn the AC generator.
The AC generator is a three-phase, brushless generator. The
generator has these components:
* Exciter rotor (armature)
* Main generator rotor (field winding)
* Permanent magnet generator (PMG) rotor
* Main generator (exciter) stator
* PMG stator
* Neutral current transformer (NCT).
The CSD turns the PMG rotor. As the PMG rotor turns, it induces
an AC voltage in the three-phase windings of the PMG stator.
This AC voltage goes to the GCU. A voltage regulator (VR)
inside the GCU transforms and rectifies the AC power to DC
power. DC power goes to the exciter field windings with the
generator control relay (GCR) in the closed position.
The stationary magnetic field caused by the DC voltage in the
windings of the exciter field (stator) makes a three-phase AC
voltage in the windings of the exciter armature (rotor). A
rotating rectifier in the rotor converts the AC to DC voltage. The
DC voltage goes to the field windings of the main generator.
Current flow in the field windings causes a rotating magnetic
field. The rotating magnetic field causes an AC voltage in the
windings of the main generator stator.
The GCU monitors the power output of the generator. When the
voltage and the frequency are within power quality limits, the
GCU can close the GCB. The voltage regulator controls AC
power output by control of the excitation power through the
GCR.
The TRIP GCR closes, and excitation power goes away if any of
these conditions occur:
* Generator switch is OFF
* Engine fire switch is in the FIRE position
* Any GCU protective function occurs
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