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The ground service bus provides power to those circuits necessary for ground servicing operations, without having to energize the remainder of the electrical system. Power to the ground service bus is supplied directly from external power or the APU generator, provided the right generator bus is not energized. The ground service bus supplies power to the battery charger and right TR 2. When the right generator bus is energized, the ground service bus functions as a part of the right AC distribution system, receiving power directly from the right generator bus. When desired, all AC busses may be energized through the external power receptacle.
There is a priority control of AC power distribution. That is, if the APU generator is supplying power to a bus, and an engine-driven generator is placed on the bus, the APU generator will automatically be taken of the bus. If external power is supplying power to a bus, and either the APU or an engine driven generator is placed on the bus, external power will automatically be taken off the bus, and the generator will take the load for that bus.
The shutdown of a generator, for any reason other than a fault on that generator bus, will automatically transfer the load from that generator to the remaining operating generator, through the AC crosstie relay. Should a generator become inoperative because of a fault on its own bus, or due to differential fault protection action, the AC crosstie relay will lock open, isolating that bus from the rest of the system. The loads connected to the bus will remain de-energized until the fault on the bus is cleared. The loads on the other generator will not be affected.
DC Power Distribution
The function of the DC power distribution system is similar to the AC system in that the right and left systems function separately. The DC system has a manual crosstie in the event of a failure of either side. In addition to the left and right systems, DC power is supplied from the battery. In the left DC system, power is supplied by two TRs, both receiving power from the left AC bus. In the right system, TR 1 is powered from the right AC bus, and TR 2 is powered from the ground service bus. When the ground service bus is receiving power from the generator bus, the two TRs are connected through the DC ground service tie relay to furnish power to the right DC bus. When the ground service bus is powered directly from either external power or the APU generator, the right TR 1 is isolated and only the right TR 2 supplies power to the DC transfer bus. The DC bus crosstie differs from the AC bus crosstie in that the DC bus crosstie is not automatic and must be opened or closed manually. In addition to supplying power to the respective DC busses, the TRs supply power to the emergency DC bus, and to the DC transfer bus.
The battery supplies 28-volt DC power to the battery direct bus (regardless of battery switch position) and when the battery switch is ON, to the battery bus. The battery is connected to the DC transfer bus when the right and left DC busses are not energized, except when ground service power is being used. The battery is being charged when the battery switch is ON and the ground service bus is energized. When the emergency power switch is ON, the battery is connected to the DC emergency bus and disconnected from the battery charger.
Continental
Rev. 12/01/00 v#29 Flight Manual
Battery Charger
The battery charger is in a charging position when the ground service bus is powered and the battery switch is on. When the battery is fully charged, the battery charger will be in a pulsating mode. If the battery is in a low state of charge, the ammeter may initially oscillate but should stabilize within 4 seconds at a continuous current of approximately 40 amperes and transitioning into a pulsating mode as the battery becomes fully charged. Pulse intervals will range from 5 seconds to 30 minutes.
Emergency AC and DC Power Supply
During normal operation, the emergency AC bus receives single phase AC power from the left AC bus, and the emergency DC bus receives power from the left DC bus. Loss of power to the left generator bus will transfer the emergency AC bus to the right AC bus and the emergency DC bus to the right DC bus.
In the event of complete loss of power, the battery will provide both AC and DC emergency power when the emergency power switch is ON. The emergency DC bus will be powered from the battery direct bus, which will also power the emergency inverter to provide power to essential equipment for approximately 30 minutes. When emergency electrical power is in use, the battery charger is not available.
ELECTRICAL - CONTROLS AND INDICATORS
Continental
Rev. 12/01/00 v#29 Flight Manual
ELECTRICAL - CONTROLS AND INDICATORS ELECTRICAL - WARNING AND CAUTION LIGHTS
Continental
Rev. 12/01/00 v#29 Flight Manual
ELECTRICAL - CONTROLS AND INDICATORS
Installed on Some Airplanes
ELECTRICAL SYSTEM SCHEMATIC
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