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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-34-00-020
Purpose
The static inverter is the backup power source for the AC
standby bus. The AC transfer bus 1 is the normal power source.
General Description
The static inverter uses DC power to give 115 volts, 400 Hz,
single phase AC power to standby loads.
The static inverter has input power whenever the BAT switch is
in the ON position or the standby power switch is in the BAT
position.
The AC standby bus usually gets power from the AC transfer
bus 1. The SPCU sends a command to the static inverter to
supply power if transfer bus 1 has no power or when you put the
standby power switch to the BAT position. The static inverter
power goes through the SPCU to the AC standby bus.
Location
The static inverter is on the E2 rack in the EE compartment.
Indication
You may monitor the static inverter on the electrical meters,
battery, and galley power module. You see these static inverter
output parameters when you put the AC meter selector to the
INV position:
* Frequency (CPS FREQ)
* Voltage (AC VOLTS).
A static inverter failure causes the amber ELEC light to come
on. This light means that the electrical meters, battery, and
galley power module has found a fault in the system and you
must do a BITE test.
Other electricaL system failures will also cause the ELEC light
to come on. See the electrical power - general section for more
information about the light and BITE functions of the electrical
meters, battery, and galley power module. (SECTION 24-00)
STANDBY POWER SYSTEM - STATIC INVERTER
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STANDBY POWER SYSTEM - STATIC INVERTER
STANDBY POWER SYSTEM - STATIC INVERTER
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Purpose
The static inverter remote control circuit breaker (RCCB)
connects battery power to the static inverter.
Location
The RCCB is inside the J9 junction box. The J9 is in the EE
compartment, in front of the E2 rack.
General Description
The RCCB closes when the SPCU signals it to close. This lets
the static inverter receive power from the battery. The SPCU
closes the RCCB when either of these conditions occur:
* The BAT switch to the ON position
* The standby power switch to BAT.
STANDBY POWER SYSTEM - STATIC INVERTER REMOTE CONTROL CIRCUIT BREAKER
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STANDBY POWER SYSTEM - STATIC INVERTER REMOTE CONTROL CIRCUIT BREAKER
STANDBY POWER SYSTEM - STATIC INVERTER REMOTE CONTROL CIRCUIT BREAKER
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STANDBY POWER SYSTEM - STATIC INVERTER REMOTE CONTROL CIRCUIT BREAKER
24-34-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Standby Power
The AC standby bus always has power when the battery switch
is in the ON position and the standby power switch is in the
AUTO or BAT position. The normal power source of the AC
standby bus is the AC transfer bus number 1. The alternate
source of power is the hot battery bus and the static inverter.
The static inverter uses 24v dc nominal power from the battery
and changes it into 115v ac, 400 Hz, single phase power.
The DC standby bus always has power when the battery switch
is in the ON position and the standby power switch is in the
AUTO or BAT position. The normal source of power for the DC
standby bus is DC bus 1. The alternate source of power is the
hot battery bus through relay K3.
The standby power system uses these controls:
* Battery switch
* Standby power switch
* Standby power control unit (SPCU).
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