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Now I need help with the PM OV module from B@C specialty

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Mon Nov 03, 2008 10:10 am Post subject: Now I need help with the PM OV module from B@C specialty

According to the B&C wiring diagram for the "504-1 PM-OV 14 Volt Over Voltage Module" I need either a 10 amp or a 15amp fuse to connect to the Power BUS. Depends on whether I have a SD8, a 200G or a SK10 alternator. This is referring to my Rotax internal generator. Ive got the 80 HP Rotax UL engine. How do I know Which type alternator this is. I cannot find anything in the manual. All this for a Fuse rating. Anybody help please? ......Geoff

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Joemotis(at)aol.com
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Posted: Mon Nov 03, 2008 12:18 pm Post subject: Now I need help with the PM OV module from B@C specialty

13.5 V, 250 W DC (at) 5500 RPM,  This off the Zenith website (at) http://www.zenithair.com/pdf-doc/912ul-80hp.pdf

  

 Joe Motis

 Do not archive

  

  In a message dated 11/3/2008 10:10:40 A.M. Pacific Standard Time,  stol10(at)comcast.net writes:

  	  Quote: 	
		  80 HP    Rotax UL engine 	




Plan your next getaway with AOL Travel.  Check out Today's Hot 5 Travel Deals!

  [quote][b]

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craig(at)craigandjean.com
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Posted: Mon Nov 03, 2008 12:35 pm Post subject: Now I need help with the PM OV module from B@C specialty

I believe those alternators are all add-ons that B&C sells and not relevant

to your Rotax. See figure Z-16 ""Rotax 912/914 System" in the appendix to

Bob Nuckoll's AeroElectric Connection for one way to use the overvoltage

module on a 912.



https://matronics.com/aeroelectric/articles/Rev11/AppZ_R11M.pdf



-- Craig

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Mon Nov 03, 2008 1:03 pm Post subject: Re: Now I need help with the PM OV module from B@C specialty

Thanks Craig. I would still need to know what fuse I need. Below is the link to the relevant diagram at B&C. At the left side the 14 gage wire is hooked into the Main power bus. my interest is in the fuse choices listed there.

http://www.bandc.biz/PM_OV504-500_RevE.pdf

I tried this link. It works fine................Geoff

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craig(at)craigandjean.com
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Posted: Mon Nov 03, 2008 2:11 pm Post subject: Now I need help with the PM OV module from B@C specialty

The symbol on the B&C schematic is actually for a circuit breaker - compare

it to the symbol for the 20 amp fuse coming off of the battery and the 15

amp fuse in the lead from the alternator before the voltage regulator. The 2

amp device feeding the relay's coil is also a circuit breaker. Otherwise you

wouldn't be able to reset the overvoltage circuit after it triggered.



In the Rotax 912 installation manual (Edition 1/Rev. 0 dated May 01/2007)

the schematic in figure 67 on page 109 shows a 25 amp breaker between the

output of the voltage regulator and the battery. The key function of a fuse

or breaker is to protect the wire attached to it. You don't want a fuse so

large that the wire ends up acting as the fuse instead. And you don't want a

wire so small that it can't safely carry the current required with a

tolerable voltage drop for normal operation. And that is a function of

current requirements *and* the physical length of the wire.



Overall I'm not wild about the general design shown in the B&C schematic - I

think it has been simplified too much just to show how the OV module is

connected. For example it has the charging current from the alternator

passing through the main bus to the battery and doesn't address the starter

circuit. It differs substantially from the typical Rotax layout shown in the

Rotax installation manual and Nuckoll's own design in figure Z-16. Since Bob

designed the OV module and probably drew the schematic on the B&C site I'd

get his opinion. He is active on the AeroElectric list on Matronics.



Sorry, I know this is not the simple answer you were looking for. But I

think the overall design of the electrical system controls how the OV

protection is designed in. If you have not already I would strongly

recommend buying and reading Bob's book cover to cover.



-- Craig



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