S 865-090-002
 S 865-091-002
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 VARIABLE SPEED CONSTANT FREQUENCY  ú 24-11-11
 GENERATOR/CONVERTERS  ú CONFIG 2 ú 01 Page 513 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 VARIABLE SPEED CONSTANT FREQUENCY GENERATOR/CONVERTER - ADJUSTMENT/TEST
_______________________________________________________________________
 TASK 24-11-11-735-021-003
 1.  System Test - Variable Speed Constant Frequency Generator/Converter___________________________________________________________________
 A. General
 (1)  
This test will make sure that the variable speed constant frequency generator/converter (VSCF) will supply power to loads correctly. During this test, it is necessary to operate the engine and connect the VSCF to loads. The loads that you will use are the lights, air conditioning, fuel boost pumps, and hydraulic pumps.

 (2)  
This test will also make sure that the disconnect circuits for the VSCF operate correctly. When you push the DISCONNECT switch, the VSCF disconnects electrically (removes the field current) and the generator continues to turn. When you push the DISCONNECT RESET button, the VSCF connects again.

 (3)  
If a system trip occurs, the M238 annunciator panel and or the VSCF NVM can be used to identify the cause of the trip. Troubleshoot the cause of the trip using the AC Generation System - Troubleshooting Procedures (AMM 24-21-00/101).

 (4)  
If a system trip occurs from a VSCF failure, it will give these indications:

 (a)  
The FF light on the M238 annunciator panel will come on.

 (b)  
The output voltage from the VSCF will be less than 10 volts.

 (c)  
The VSCF Fault History Display Module will identify the cause as VSCF FAULT - PROTECTIVE TRIP.

 (5)
The VSCF is on the accessory gearbox at the 8 o'clock position.

 B.
References

 (1)  
AMM 24-11-11/401, Variable Speed Constant Frequency
 Generator/Converter

 (2)  
AMM 24-11-11/501, Fault History Display Procedure - Variable Speed Constant Frequency Generator/Converter

 (3)  
AMM 24-21-00/101, AC Generation System

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 71-00-00/201, Power Plant

 (6)  
WDM 24-21-11, WDM 24-21-21

 C.
Access

 (1)  
Location Zones
 506 Engine 1 - Accessory Gearbox, 8 o'clock
 606 Engine 2 - Accessory Gearbox, 8 o'clock
 101 Left Control Cabin - P5 overhead panel

 (2)  
Access Panels
 5740 CSD Access Door - Engine 1
 5840 CSD Access Door - Engine 2

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 VARIABLE SPEED CONSTANT FREQUENCY ú  24-11-11
 GENERATOR/CONVERTERS WITH THE THREE ú CONFIG 3 LIGHT DISPLAY MODULE ú 01 Page 501 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
POWER AND NEUTRAL TERMINALS
EXCITATION LEADS
COOLING 
AIR 
INLET 
CASE 
COOLING  DRAIN 
AIR  PLUG 
EXHAUST  VSCF 
GENERATOR/ 
CONVERTER 
DISPLAY MODULE 
SELF-TEST 
LAST VSCF FAULT 
LAST SYS FAULT 
SINCE RESET 
S1 
A 

CURRENT
TRANSFORMER
LEADS

MAIN
CONNECTOR

CASE
SEE A  PRESSURE-FILL VALVE
INPUT SHAFT
VACUUM BREAK VALVE
SIGHT GLASS
SPLINE CAVITY PRESSURE-FILLINSTRUCTION VALVE
PLATE IDENTIFICATIONOIL OUT SEE B
PLATE
PORT SWITCHES
DISCONNECT RESET
FLIGHT MESSAGES
SYS FAULT RESET

S2
LIGHTS
VSCF Generator/Converter Display Module Indications
Figure 501 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
　
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