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The standby power system uses these components and relays
to give power to the AC and DC standby buses at all times:
* Static inverter
* Remote control circuit breaker (RCCB)
* K5 standby normal relay
* K3 standby alternate relay.
Standby Power Logic
When you close the battery switch, and the standby power
switch is in AUTO, the AC and DC standby buses have power.
The battery switch signals the SPCU to close the RCCB to give
power to the static inverter. The inverter then powers the AC
standby bus.
SPCU logic gives power to the AC and DC standby buses. K5
energizes when transfer bus 1 and DC bus 1 both have power to
give standby bus power. If either transfer bus 1 or DC bus 1 has
no power, K5 opens. In this condition, the static inverter powers
the AC standby bus.
The DC standby bus gets power from the hot battery bus when
K3 energizes. K3 energizes when all of these are true:
* Battery switch to ON position
* Standby power switch to AUTO
* AC transfer bus 1 and/or DC bus 1 does not have power.
K3 also energizes when the standby power switch is in the BAT
position. This occurs with the battery switch in either position.
The standby power switch in the OFF position keeps power off
of the AC and DC standby buses. The RCCB, K3, and K5 get no
signals and no power goes to the standby buses.
The SPCU has these other relays that control DC power:
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* Battery bus normal relay (K2)
* Battery bus alternate relay (K1)
* Switched hot battery bus relay (K8).
See the DC generation section for more information about these
relays. (SECTION 24-30)
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General
The STANDBY PWR OFF light shows that the standby power
system buses have no power. The ELEC light comes on to show
that the standby power system has a failure.
STANDBY PWR OFF Light
The STANDBY PWR OFF light is on the generator drive and
standby power module (P5-5). This amber light comes on when
one of these buses have a low voltage condition:
* AC standby bus
* DC standby bus
* Battery bus.
The electrical meters, APU and galley power module (P5-13)
has circuits which monitor the voltage at these buses for low
voltage conditions.
An AC low voltage condition happens when the voltage at the
AC standby bus goes below 100 v AC for more than two
seconds.
A DC low voltage condition happens when the bus voltage goes
below 17.5v dc for more than two seconds.
The P5-13 supplies the electrical ground for the STANDBY PWR
OFF light. The master caution and the ELEC annunciator on the
P7 panel also come on.
ELEC Light
The ELEC light is on the P5-13 module. This amber light comes
on when the module finds a failure in the electrical system or an
internal failure. The master caution and the ELEC annunciator
also come on.
The SPCU monitors components of the standby power system.
The SPCU causes the ELEC light to come on if any of these
conditions are true:
* Internal SPCU relay fails
* SPCU power supply fails
* SPCU internal circuit card fails
* Static inverter voltage output is below 100 v AC for more than
two seconds, and there is a static inverter on command from
the SPCU control logic.
The SPCU internal relays are important components of the
electrical system distribution. These are the internal relays that
the SPCU monitors:
* Battery bus alternate (K1)
* Battery bus normal (K2)
* Switched hot battery bus (K8)
　
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