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idleup
Joined: 06 Aug 2011
Posts: 19
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 Posted: Sun Apr 21, 2013 1:37 pm Post subject: E-Bus alternative feed turned on during normal operations... |
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What happens if your E-Bus feed switch is turned on during normal operations? In this scenario it looks like power would be coming in from two directions according to Z-13/8... If that is not a problem, then why have an E-bus alt switch at all?
- Matt
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enginerdy(at)gmail.com
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| Posted: Sun Apr 21, 2013 2:06 pm Post subject: E-Bus alternative feed turned on during normal operations... |
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If you look at the source, the EBUS 15A circuit is fed from the hot side of the battery contactor. If there was not an E-bus alternate feed switch, there would be no way to turn off the items connected to the endurance bus, without disconnecting the battery.
The way it is, you can use the battery contactor to switch ALL of your loads in normal operations, then in alternator failure conditions, you can switch the e-bus switch to ON and the battery contactor to OFF, reducing your loads to just the items powered directly from the main battery bus (including the switched-on endurance bus).
For the other part of the question, if you switch the e-bus on during normal operations, the energy to the e-bus will flow through the contactor instead of the diode, because the voltage drop in the diode will keep current from flowing through it (because there is an easier path).
That is my understanding. Please someone speak up if I've got it wrong.
Daniel
On Apr 21, 2013, at 4:37 PM, idleup wrote:
| Quote: |
What happens if your E-Bus feed switch is turned on during normal operations? In this scenario it looks like power would be coming in from two directions according to Z-13/8... If that is not a problem, then why have an E-bus alt switch at all?
- Matt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399065#399065
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idleup
Joined: 06 Aug 2011
Posts: 19
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| Posted: Sun Apr 21, 2013 2:19 pm Post subject: Re: E-Bus alternative feed turned on during normal operation |
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Okay, I understand about the necessity for the switch otherwise you could never shut off power to the e-bus.
But I am still confused about if there would be a problem if it were inadvertently switched on during normal operations. You mentioned that it would flow from the contactor instead of the diode, do you mean the battery bus side of the contactor?
I guess what I am really concerned with is would their be any problem if it were switched on during flight inadvertently? I am thinking no, but just want confirmation of that...
- Matt
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enginerdy(at)gmail.com
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| Posted: Sun Apr 21, 2013 2:38 pm Post subject: E-Bus alternative feed turned on during normal operations... |
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I think you would only notice the difference if you have a voltmeter on the e-bus. In normal operation, you would see about 13.5V, but with the e-bus contactor turned on, it would rise to 14V or so. (depending on the voltage of your system).
This is because in normal operation, the e-bus diode will take out about half a volt from the battery's bus voltage. When you short the e-bus back to the battery, the 0.5V drop will go away. Current is no longer flowing through the e-bus diode -- it is coming straight from the battery now. When you turn the e-bus switch off, current will go back to coming through the diode like nothing happened.
On Apr 21, 2013, at 5:19 PM, idleup wrote:
| Quote: |
Okay, I understand about the necessity for the switch otherwise you could never shut off power to the e-bus.
But I am still confused about if there would be a problem if it were inadvertently switched on during normal operations. You mentioned that it would flow from the contactor instead of the diode, do you mean the battery bus side of the contactor?
I guess what I am really concerned with is would their be any problem if it were switched on during flight inadvertently? I am thinking no, but just want confirmation of that...
- Matt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399069#399069
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