S 985-137-003

 (4)  
Push and release switch S2 to make sure the VSCF is connected. Ignore any light illumination. (S1 will not function if the VSCF is disconnected.)

 S 985-138-003

 (5)
Push and hold switch S1 on the VSCF to see three messages.

 NOTE: If normal, all three messages will be displayed in less than
____ 10 seconds. The third message will be maintained for 20 seconds if abnormal.
 (a)  
DISPLAY MODULE SELF-TEST RESULTS

 (b)  
LAST VSCF FAULT

 (c)  
LAST SYSTEM FAULT SINCE RESET

 S 985-150-003
 (6)  Continue to hold S1. In approximately 30 seconds, after pushing switch S1, the two-part message display begins with an expanded message for each of the first three S1 messages in their same order, followed by a 12 second lights off interval, followed by a sequence of fault messages beginning with the most recent fault message and continuing in sequence to a maximum of 15 fault messages, if applicable. Release switch S1.
 NOTE: The user should note each two-part message (e.g., 5, 4),
____ as it is displayed, for later reference to the Expanded Fault Messages chart.
 S 765-144-003
 (7)  
Close the CSD access door.

 S 865-145-003

 (8)  
Remove electrical power if it is no longer necessary (AMM 24-22-00/201).

 TASK 24-11-11-735-092-003
 5. Disconnect Test - Variable Speed Constant Frequency Generator/Converter
_______________________________________________________________________
 NOTE: This is a scheduled maintenance task.
____
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 VARIABLE SPEED CONSTANT FREQUENCY ú  24-11-11
 GENERATOR/CONVERTERS WITH THE THREE ú CONFIG 3 LIGHT DISPLAY MODULE ú 01 Page 513 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 A.
B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
General
 (1)  
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 switch on the VSCF to DISCONNECT RESET, the VSCF connects again.

References

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

 (2)  
AMM 24-21-00/101, AC Generation System

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 71-00-00/201, Power Plant

 (5)
WDM 24-21-11, WDM 24-21-21Prepare for the Disconnect Test.

 S 865-093-003

 (1)  
Supply electrical power to the airplane busses from the APU generator or the external power source (AMM 24-22-00/201).

 S 865-094-003

 (2)  
Start the engine (AMM 71-00-00/201).

 (a)  Make sure that the applicable DRIVE or LOW OIL PRESSURE No. 1 or 2 light on the P5-5 panel goes off.
 S 985-095-003
 (3)  
Push and release the applicable GEN 1 or GEN 2 switch on the P5-4 panel to ON.

 S 985-096-003

 (4)  
Turn the ac meters switch on the P5-13 panel to the applicable GEN 1 or GEN 2 position.

 (a)  Make sure that the frequency meter shows 400 | 5 Hz.

 (b)
Make sure that the ac voltmeter shows 115 | 5 volts.Do a Test of the Electrical Disconnect in the VSCF.

 S 985-097-003

 (1)  
Operate the applicable DISCONNECT No. 1 or No. 2 switch on the P5-5 panel.

 (a)  
If the guard on the DISCONNECT switch has lockwire in it, remove the lockwire.

 (b)  
Lift the guard on the DISCONNECT switch.

 (c)  
Push and release the DISCONNECT switch.

 S 215-099-003
 (2)  
Make sure that the applicable DRIVE or LOW OIL PRESSURE No. 1 or No. 2 light comes on.

 S 865-100-003

 (3)  
Make sure that there is no residual voltage.

 (a)  Push and hold the RESID VOLTS button.
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