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Of Master Switches

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639
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panama
Could anybody bring me some more light as to how the instruments and systems relate to the Master Switches? So far I know of the following master switches (FSUIPC):

- Alternator
- Master Battery switch
- Master Avionics switch
- Fuel Valves

As I understand if the Master Avionics switch is on then all of the avionic (electronic) instruments work.

Is the Master Battery only used for starting engines? or is it also needed to have the avionics working? i.e. if Master Battery is off, then Master Avionics does not work, i.e. both switches are electrically in series.

What about the Master Alternator switch, based on my very poor knowledge of mechanics I would assume that if the Alternators are off then the Battery does not get charged but that other than this, it is not required for operation of instruments.
 
Last edited:

n4gix

Resource contributor
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unitedstates
The "Master Battery" switch effectively disconnects the batteries from the master bus. All other electrical circuits, including Master Avionics connects to the master bus.

Master Battery
.....Master Avionics

Alternator/Generator switches connect the alternators/generators into the master bus, which in turn (a) powers the charging system and (b) provides power to everything connected to the master bus if the batteries are either disconnected or have failed.

Fuel Valves may be either electrical or mechanical. If electrical, they obtain power from the master bus.
 
Messages
639
Country
panama
Ok so basically this is what you mean in a simple electrical diagram. Here I depict a device between curly brackets and a switch as <Switch>:

{Generator}------<MasterGen>------+
| MASTER BUS
{Battery}---------<MasterBatt>-----+---------------{Avionics}
|

So if generator fails and battery is disconnected Avionics don't get power. If there is no generator connected but the battery is the Avionics get power.
Right?


The "Master Battery" switch effectively disconnects the batteries from the master bus. All other electrical circuits, including Master Avionics connects to the master bus.

Master Battery
.....Master Avionics

Alternator/Generator switches connect the alternators/generators into the master bus, which in turn (a) powers the charging system and (b) provides power to everything connected to the master bus if the batteries are either disconnected or have failed.

Fuel Valves may be either electrical or mechanical. If electrical, they obtain power from the master bus.
 

n4gix

Resource contributor
Messages
11,674
Country
unitedstates
Ok so basically this is what you mean in a simple electrical diagram. Here I depict a device between curly brackets and a switch as <Switch>:

Code:
 {Generator}------<MasterGen>------+
                                                    | MASTER BUS
 {Battery}---------<MasterBatt>-----+---------------{Avionics}
                                                    |

So if generator fails and battery is disconnected Avionics don't get power. If there is no generator connected but the battery is the Avionics get power.
Right?

That is correct. In Real LifeTM of course, the output from the generator/alternator system output is split between the "charging system" and the main bus, but for FS usage we can opt for the simplest model... ;)
 
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