Learjet 20 Series Pilot Training Manual page 42

DISTRIBUTION
Alternating current from the inverters is dis-
tributed through the left and right AC buses.
Primary inverter output goes to the left bus,
secondary inverter output to the right bus.
These two buses are tied together by the AC
bus-tie circuit breaker, enabling either inverter
to power all AC buses. Auxiliary inverter out-
put, if installed, may be directed to either the
left or right bus.
Two step-down transformers draw 115-VAC
power from their respective 115-VAC buses,
26 V
AC TRANS
BUS
L AC BUS
PRIMARY
INVERTER
POWER
RELAY
PRI INV
SW
PRI INV
60 A
CB
L PWR
BUS
L
L GEN
GEN
BUS
LEGEND
BATTERY POWER
GENERATOR POWER
LEARJET 20 SERIES PILOT TRAINING MANUAL
L AC
BUS
2 A
L AUX
10
10 A
AC BUS CB
CB
A
L BUS
AUX INV
PRI-SEC SW
R BUS
PARALLELING BOX
AUX
INVERTER
AUX INV
ON-OFF SW
POWER
RELAY
60 A
10 A
275
A
GROUNDPOWER
PRIMARY INVERTER POWER
Figure 2-13. AC Power Distribution (Typical)
FOR TRAINING PURPOSES ONLY
reducing the voltage to 26 VAC. The 26 VAC
is then distributed to the installed equipment
requiring 26 VAC.
Each 115-VAC and 26-VAC bus is protected
by its respective bus circuit breaker.
The 26-VAC BUS circuit breaker applies to SNs
24-315 and subsequent, and 25-189 and subse-
quent, except 25-191. On prior SNs the trans-
formers were wired directly to the bus.
R AC
BUS
7.5 A
P S
10
R AUX
AC BUS CB
AC VOLTS
AUX INV
CB
R ESS
50 A
BAT CHG BUS
FlightSafety
international
TRANS
2 A
R AC BUS
10 A
A
CB
SECONDARY
INVERTER
POWER
RELAY
SEC INV
SW
SEC INV
60 A
CB
R PWR
BUS
10 A
R GEN
BUS
275
A
AUXILIARY INVERTER POWER
SECONDARY INVERTER POWER
26 V
AC
BUS
R
GEN
2-15