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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-090
AC GENERATION - JUNCTION BOXES - COMPONENT LOCATIONS
AC GENERATION - JUNCTION BOXES - COMPONENT LOCATIONS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-090
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AC GENERATION - JUNCTION BOXES - COMPONENT LOCATIONS
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D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
Each generator control unit (GCU) has these functions:
* Control a generator control breaker (GCB) and a bus tie
breaker (BTB)
* Supply/control excitation to an IDG generator
* Protect the electrical system and an IDG from electrical
parameters not in limits
* Control electrical system indication on the P5-5 and P5-4
modules.
* Give built-in-test for fault isolation.
GCU Inputs
GCU1 and GCU2 receive power from one of these two sources:
* Permanent magnet generator in the IDG (AC power)
* 28v dc power from the BATTERY BUS for GCU 1 and from DC
STBY for GCU 2.
Each GCU uses 28v dc to power protection circuits and regulate
IDG output voltage. The GCU converts the PMG AC input to DC
power.
Each GCU receives three phase sense current inputs from two
points:
* The neutral current transformers (NCT) inside each IDG,
between the IDG and ground
* The differential protection current transformer (DPCT) on the
IDG power feeders, between the IDG and the GCB, in the
respective PDP (Power Distribution Panel).
Each GCU also receives three phase sense voltage inputs from
splices at the GCB.
GCU1 and GCU2 receive these inputs:
* Generator switch position (momentary)
* Oil pressure input from the IDG
* Position status from the GCB
* Position status from the EPC
* Position status from the APB
* Position status from the BTB
* Signal from the fire switch
* Ready-to-load (RTL) signal from the common display system
display electronics units (CDS/DEU)
* Indication if BPCU fail-safe protection is active
* BTB command open/close signal
* Airplane on ground status (AIR/GRD)
* SOURCE OFF light on the P5 (GCU supplies ground)
* TRANSFER BUS OFF light on the P5 (GCU supplies ground).
The GCU monitors IDG oil pressure and frequency to control the
DRIVE light on the generator drive and standby power module
(P5-4). The light comes on for low oil pressure or
underfrequency.
The RTL signal tells the GCU that the engine is operating at a
sufficient speed to operate the IDG.
AC GENERATION - GENERATOR CONTROL UNIT (GCU) - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-101
GCU Outputs
GCU1 and GCU2 have these output signals:
* GCB close
* GCB open
* BTB close
* BTB open.
GCU Fail-Safe
The GCU has fail-safe protection if it loses the protection or
control capability for the power channel. These actions occur if
the GCU goes to a fail-safe condition:
* GCR opens
* GCB opens
* BTB closes (if open)
* GCU FAULT LIGHT on face of GCU comes on.
BPCU Fail-safe
The GCU receives a 28v dc signal from the BPCU when the
BPCU operates properly. If the BPCU goes into a failsafe mode,
the 28v dc signal goes away. The GCU responds to the failsafe
signal based on GCU position through programming pins. See
the External Power-BPCU section for more information on the
BPCU failsafe signal. (SECTION 24-40)
Built-In-Test-Equipment (BITE)
Each GCU has front face BITE to help you do troubleshooting of
the electrical system. See GCU/AGCU - TRAINING
INFORMATION POINT in this section for more information.
AC GENERATION - GENERATOR CONTROL UNIT (GCU) - GENERAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-101
AC GENERATION - GENERATOR CONTROL UNIT (GCU) - GENERAL DESCRIPTION
AC GENERATION - GENERATOR CONTROL UNIT (GCU) - GENERAL DESCRIPTION
EFFECTIVITY
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