High Oil Temperature (HIGH OIL TEMP) Lights
Illuminated (amber) - generator drive oil temperature exceeds operating limits.

DISCONNECT Switches (guarded and safetied)
Disconnects generator drive.
Generator drive cannot be re-engaged in the air.

Generator Drive Oil Temperature (GEN DRIVE OIL TEMP) Indicator
Displays the temperature of the oil used in the generator drive.
Copyright . The Boeing Company. See title page for details.
6.10.4  December 1, 2000

Electrical -Controls and Indicators
737 Operations Manual
IN scale (inner) - Displays the temperature of the oil entering the generator drive.
RISE scale (outer) - Displays the temperature rise within the generator drive.
.  
Higher than normal temperature rise indicates excessive generator load or
poor condition of the generator drive

.  
Lack of adequate cooling will generally cause the temperature RISE to
decrease.

Standby Power (STANDBY PWR OFF) Light
Illuminated (amber) - AC standby bus is inactive.

STANDBY POWER Switch
AUTO (guarded position) –
.
In flight, or on the ground, and AC transfer busses powered:

.
AC standby bus is powered by AC transfer bus 1

.
DC standby bus is powered by DC bus 1.

.
In flight, loss of all AC power

.  
AC standby bus is powered by the battery or, on some airplanes, the battery bus, through the static inverter

.
DC standby bus is powered by the battery bus

.  
a fully charged battery will provide a minimum of 30 minutes of standby power.

.  
On the ground, loss of all AC power - No automatic transfer of power. AC
and DC standby busses are not powered.

OFF (center position) –
.
STANDBY PWR OFF light illuminates

.
AC standby bus, static inverter, and DC standby bus are not powered.

BAT (unguarded position) –
.  
AC standby bus is powered by the battery or, on some airplanes, the
battery bus, through the static inverter

.
DC standby bus is powered by the battery bus

.  
The battery bus is powered by the hot battery bus, regardless of the
battery switch position.

Drive Temperature (DRIVE TEMP) Switch
RISE/IN - Selects RISE or IN temperature to be displayed on the GEN DRIVE OIL TEMP indicator.
Copyright . The Boeing Company. See title page for details.
June 7, 2002   6.10.5
Electrical -
Bus Switching

Ground Power (GRD POWER AVAILABLE) Light
Illuminated (blue) – external power bus is powered by ground power supply.
Remains illuminated as long as ground power source is attached outside the airplane.

Ground Power (GRD PWR) Switch
Three position switch, spring–loaded to neutral.
OFF – disconnects ground power from both generator busses.
ON – if momentarily moved to the ON position and ground power is available:

.
removes previously connected power from AC generator busses

.  
connects ground power to both AC generator busses if power quality is
correct

.
switches the ground service bus to the generator bus 1

.
deactivates the ground service switch.

Copyright . The Boeing Company. See title page for details.
6.10.6   December 3, 2004

Electrical -Controls and Indicators 737 Operations Manual

AC Ammeter
Indicates engine generator load in amperes.

TRANSFER BUS OFF Light
Illuminated (amber) – related transfer bus is inactive.

BUS OFF Light
Illuminated (amber) – related generator bus is inactive.

Generator Off Bus (GEN OFF BUS) Light
Illuminated (blue)- related generator is not supplying the generator bus.

Generator Switch (GEN 1/GEN 2)
Three position switch, spring–loaded to neutral.
OFF - disconnects related engine generator from the generator bus.
ON - connects related engine generator to the generator bus if the power quality

is correct. Disconnects the previous power source.

Bus Transfer (BUS TRANS) Switch
AUTO (guarded position) - upon failure of one engine generator bus, its transfer bus is switched to the active generator bus. Allows TR1 and TR2 to be operated in parallel.
OFF - Isolates transfer busses by preventing operation of the bus transfer relays, and opens TR3 disconnect relay. Prevents the battery charger from switching to its alternate source of power, main bus 2.

APU Generator Off Bus (GEN OFF BUS) Light
Illuminated (blue) – APU is at its operating speed and not powering a generator bus.
　
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