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nuckolls.bob(at)aeroelect
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 Posted: Tue Apr 19, 2011 3:04 pm Post subject: Single shunt with two altenators Main and Stby |
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| Quote: |
As you can tell I really don't want to install a second shunt if I
can help it.
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Then don't do it. Main alternator-out operations
should be according to a PLAN.
| Quote: | I also don't plan to use the hall effect option for the standby regulator.
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Is this a 'option'? The regulator was designed
to annunciate failure of the main alternator
as indicated by the alternator picking up ship's
loads. Circuitry within the regulator reads the b-lead
current and stops the ALTERNATOR LOADED light from
flashing when total loads drop below 20A.
| Quote: | Thanks for any help.
|
You don't need to install ANY ammeters. They
are adjuncts to troubleshooting . . . not
in-flight systems management. But the hall
effect sensor on the SB1B regulator is not
an ammeter. It is part of an adjunct to in-flight
operations in the Z-12 configuration.
You can run the SD-20 on about any alternator
regulator for a 14V system. But the B&C standby
regulators offer ALTERNATOR LOADED annunciation
to signal the main alternator failure.
I know I can install a second shunt and use a switch to send the
signal to the EMS for which shunt data I want displayed but this
seems like extra parts for little benefit.
What's your proposed Plan-B for pressing
the SD-20 into service as backup for a failed
alternator?
Bob . . .
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rvg8tor
Joined: 06 Apr 2009
Posts: 50
Location: Olympia, WA
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| Posted: Tue Apr 19, 2011 4:06 pm Post subject: Re: Single shunt with two alternators Main and Stby |
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I can't figure out how to break up the quoted part so my answers are in blue.
| nuckolls.bob(at)aeroelect wrote: | | Quote: |
As you can tell I really don't want to install a second shunt if I
can help it.
|
Then don't do it. Main alternator-out operations
should be according to a PLAN.
| Quote: | I also don't plan to use the hall effect option for the standby regulator.
|
Is this a 'option'? The regulator was designed
to annunciate failure of the main alternator
as indicated by the alternator picking up ship's
loads. Circuitry within the regulator reads the b-lead
current and stops the ALTERNATOR LOADED light from
flashing when total loads drop below 20A.
| Quote: |
The light comes on when the standby alternator comes on the instructions say that the hall effect is optional to show when the load comes under 20A with the blinking light, mine would just show a steady light. My plan is I know what equipment I want on and I plan to shutoff or pull the CB for all unwanted items, I know I will be under 20A with this plan. Also with my main alternator off (I would do this as part of the failure procedure) I would see the load on the ammeter coming from the standby alternator with the one shunt two alternator connection I asked about in the first post. So would this work, I am trying to find the pitfalls.
Thanks for any help.
|
You don't need to install ANY ammeters. They
are adjuncts to troubleshooting . . . not
in-flight systems management. But the hall
effect sensor on the SB1B regulator is not
an ammeter. It is part of an adjunct to in-flight
operations in the Z-12 configuration.
You can run the SD-20 on about any alternator
regulator for a 14V system. But the B&C standby
regulators offer ALTERNATOR LOADED annunciation
to signal the main alternator failure.
As far as I can tell the light will still come on to show the SD20 is providing power, I just will not get the blinking overloaded light unless I read it wrong.
From the install instructions:
"The SB1B-14 will operate without the hall-effect current sensor attached. The Standby Alternator ON annunciator will illuminate normally but will not flash if the standby alternator output is below 20 amps."
The bus sense wire comes from the main bus to terminal #3 of the regulator
I know I can install a second shunt and use a switch to send the
signal to the EMS for which shunt data I want displayed but this
seems like extra parts for little benefit.
What's your proposed Plan-B for pressing
the SD-20 into service as backup for a failed
alternator?
As stated above if it comes on I would reduce the load to a know set of equipment and known amp level.
Bob . . . |
So will hooking both B leads to one side of the shunt be harmful in any way, since only one alternator is on at a time, I should always read the amperage being provided to the main bus and battery no matter which alternator is providing the power. Is there any instance when both alternators would be outputting power under the Z12 plan?
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_________________
Mike "Nemo" Elliott
RV-8A QB (Engine)
www.mykitlog.com/rvg8tor |
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