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* TRU 3 has no power.
K1 also energizes when the standby power switch is put to the
BAT position.
Standby Normal Relay (K5)
The standby normal relay (K5) energizes to let the DC standby
bus get power from DC bus 1. The AC standby bus also gets
power for AC transfer bus 1 when the relay energizes. The K5
relay energizes when these conditions are true:
* Standby power switch is in the AUTO position
* Both DC bus 1 and AC transfer bus 1 have power.
The AC standby bus gets power from the static inverter when
K5 is open.
Standby DC Alternate Relay (K3)
The standby DC alternate relay (K3) energizes to let the DC
standby bus get power from the battery. The relay energizes
when these conditions are true:
* Standby power switch is in the AUTO position
* Either or both DC bus 1 and AC transfer bus 1 have no
power.
The K3 also energizes if the standby power switch is put in the
BAT position.
K3 is open if DC bus 1 and AC transfer bus 1 have power or the
standby power switch is put in the OFF position.
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-30-00-005
Switched Hot Battery Bus Relay (K8)
The switched hot battery bus relay (K8) energizes to let the
switched hot battery bus get power from the battery or the
battery charger.
K8 energizes when the battery switch is in the ON position.
K8 also energizes when the airstairs handle is in the STANDBY
position.
Other Relays
These relays control DC power distribution and are outside of
the standby power control unit:
* TRU 3 transfer relay (R622)
* DC bus tie relay (R9)
* DC ground service relay (R634).
The SPCU controls all of the relays except the DC ground
service relay. The BPCU controls the ground service relay.
TRU 3 Transfer Relay (R622)
The TRU 3 transfer relay (R622) controls the power source of
TRU 3. The relay energizes to let TRU 3 get power from AC
transfer bus 1 when AC transfer bus 2 loses power. R622
energizes when all of these conditions are true:
* Bus transfer switch is in the AUTO position
* AC transfer bus 1 has power
* AC transfer bus 2 does not have power.
DC Bus Tie Relay (R9)
The DC bus tie relay energizes to connect DC bus 1 and DC bus
2 in parallel. The relay energizes when all these conditions are
true:
* Bus transfer switch is in the AUTO position
* AC transfer bus 1 or AC transfer bus 2 has power
* Autopilot system is not in the approach mode with glideslope
capture.
The relay opens when any of the conditions are not true.
Ground Service Bus Relay (R634)
The ground service bus relay (R634) controls the power source
selection of the ground service DC bus. The BPCU lets R634
energize when you push the ground service switch on the
forward attendant panel. The relay de-energizes to let this bus
get power from the DC bus 1.
Static Inverter RCCB
The static inverter gets input power through the static inverter
RCCB when it closes. This RCCB is normally closed. See the
standby power system section for more information.
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-30-00-005
GUN 013-015, 111-114, 201-999
Dual Battery RCCB
The auxiliary battery and auxiliary battery charger are in
parallel with the main battery and main battery charger when
the dual battery RCCB closes. This RCCB is normally open. See
the DC Generation system section 24-31 for more information
about the operation of this RCCB.
GUN ALL
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 24-30-00
Page 8
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-30-00-005
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-30-00
Page 9
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-30-00-005
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
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