DC GENERATION SYSTEM - ADJUSTMENT/TEST
1. Test DC Generation System Operation (CA ALL EXCEPT B2501 thru B2503; IDO ALL EXCEPT 601)
A. Test Battery Control and Indicator Circuits Using Airplane Battery
NOTE: To obtain an indication from the M238 module, place IND-TEST switch (S2) in IND position.
(1)
Remove electrical power from airplane and set BAT switch and STANDBY POWER switch to OFF.
(2)
Open all dc circuit breakers on P6-5 and P6-6 panels except leave the following closed:
(a)
HOT BAT BUS (C22) on P6-6
(b)
DC BUS INDICATION HOT BAT (C134) on P6-5
(3)
Set dc meters selector switch to BAT and check that dc voltmeter indicates 26士 4 volts.
(4)
Close the following circuit breakers:
(a)
BAT BUS CONT AUTO (C145) on P6-5
(b)
DC BUS INDICATION BAT (C26) on P6-5
(5)
Set BAT switch to ON and check that BATT light on electrical power annunciator module M238 comes on.
(6)
Set dc meters selector switch to BAT BUS and check that dc voltmeter indicates 26士 4 volts.
(7)
Open BAT BUS CONT AUTO (C145) circuit breaker on P6-5.
(8)
Close BAT BUS CONT MANUAL (C789) circuit breaker on P6-5.
(9)
Observe that dc voltmeter indicates zero.
(10)
Observe that BATT light on M238 is extinguished.
(11)
Set STANDBY POWER switch to BAT.
(12)
Observe that dc voltmeter indicates 26 士 4 volts and BATT light on M238 is on.
(13)
Set STANDBY POWER switch to OFF.
(14)
Set BAT switch to OFF.
B. Test Bus Protection Panel TR Unit Circuit
NOTE: To obtain an indication from the M238 module, place IND-TEST switch (S2) in IND position.
(1)
Check that EXTERNAL POWER BUS PROT PANEL AC (C811) and EXTERNAL POWER GRD SERVICE (C812) circuit breakers on P6-12 panel are closed.
(2)
Provide external power to the airplane and check that the following lights are on.
(a)
EXTERNAL POWER CONN light on external power panel P19.
(b)
GND POWER AVAILABLE light on overhead panel P5-4.
(c)
EXT PWR TR light on M238.
(d)
EXTERNAL POWER NOT IN USE light in external power panel P19.
5B1
Feb 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-31-0 Page 501
C. Test No. 3 TR Unit Circuit
NOTE: To obtain an indication from the M238 module, place IND-TEST switch (S2) in IND position.
(1)
Close BAT BUS (C20), DC BUS INDICATION TR NO 3 (C25), BAT TRANS CONT (C167), and FUELING & EXT PWR CONT (C32) circuit breakers on panel P6-5.
(2)
Check that No 1 TRANS CONT (C464), NO 2 TRANS CONT (C465), and TR UNITS NO 3 (C808) circuit breakers on panel P6-4 are closed; check that NO 2 GEN BUS MAIN DISTRIBUTION (C817) circuit breaker on panel P6-12 is closed.
(3)
Set BAT switch to ON.
(4)
Set GRD PWR switch to ON. Check that EXTERNAL POWER NOT IN USE light on external power panel P19 goes off and TR3 light on M238 comes on.
(5)
Check that BATT light on M238 is on.
(6)
Check that dc voltmeter indicates 26 + 4 volts when meters selector switch is set to TR 3 and BAT BUS.
(7)
Open HOT BAT BUS (C22) circuit breaker on panel P6-6. Check that dc voltmeter reads 26 + 4 volts when selector switch is set to BAT BUS and zero when set to BAT.
(8)
Set BAT switch to OFF. Check that BATT light on M238 goes off and dc voltmeter reads zero when selector switch is set to BAT and BAT BUS.
(9)
Open TR UNITS NO 3 (C808) circuit breaker and check that TR3 light on M238 goes out.
D. Test No. 1 and 2 TR Units Circuits and Control
NOTE: To obtain an indication from the M238 module, place IND-TEST switch (S2) in IND position.
(1)
Close BAT BUS CONT AUTO (C145) circuit breaker on P6-5.
(2)
Check that the following circuit breakers are closed:
(a)
CONTROL GENERATOR NO 1 (C4), CONTROL GENERATOR NO 2 (C5), CONTROL GENERATOR APU (C6), and TR UNITS NO 1 (C806) on P6-4.
(b)
DC BUS POWER NO 1 (C31) and DC BUS INDICATION BUS NO 1 (C23) on P6-5.
(c)
HOT BAT BUS (C22) on P6-6.
(d)
TRANSFER BUS NO 1 NORMAL (C819) and NO 2 ALT (C822) on P6-11.
(3)
Open TR UNITS NO. 2 circuit breaker (C807) on P6-4, and TRANSFER BUS NO 2 NORMAL (C821) on P6-12.
(4)
Set BAT switch to ON and check that NO. 1 light on M238 is on.
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