---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Tue 11/20/18: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:48 PM - Rotax 912 UL Rectifier wiring (Hugh McKay) 2. 04:22 PM - Re: Rotax 912 UL Rectifier wiring (Dave Alberti) 3. 06:01 PM - Re: Rotax 912 UL Rectifier wiring (Hugh McKay) 4. 06:39 PM - Re: Rotax 912 UL Rectifier wiring (Dave Alberti) 5. 08:32 PM - Re: Rotax 912 UL Rectifier wiring (Hugh McKay) ________________________________ Message 1 _____________________________________ Time: 01:48:09 PM PST US From: Hugh McKay Subject: RotaxEngines-List: Rotax 912 UL Rectifier wiring I need some advice by anyone out there who may be able to clear up a questi on I have concerning checking the output wiring of the standard Rotax 912 r ectifier used with the 912 UL engine. I have this rectifier on my Allegro 2000 ELSA (912 UL engine). For additional information I am attaching my air plane wiring one line diagram that shows how my rectifier is wired. Also I want to make reference to a Blog article authored by Klaus Truemper titled =9C18 December 2012 Testing Rotax 912/914 Generator and Rectifier =9D. You can Google the title and read the article. In the section of Mr. Truemper=99s article (Testing Regulator/Rectifi er) where he states =9CWith the Master switch off: The above test (re ferring to the previous paragraph) should show 0 voltage for all three case s. I do not know what Mr. Truemper=99s wiring diagram looked like bec ause he did not offer one in his article. After reading Mr. Truemper=99s article and because of some perceived battery charging issues I was having with my airplane I thought I would che ck my rectifier according to his instructions in the article section titled (Testing Regulator/Rectifier). All the tests he listed (the same ones I di d) fell within the values stated in his article except those tested with th e Master switch =9Coff=9D. In my case, with the Master switch =9Coff=9D the voltage to ground on R, B+, and C each measured 1 2.7 VDC in stead of 0 VDC. Again I don=99t have Mr. Truemper=99s wiring diagram, but in th e wiring diagram shown in the Rotax 912 UL engine installation manual their wiring diagram indicates that there will be regular 12 VDC battery voltage on R, B+, and C when the master switch is =9Coff=9D. My question is this: Assuming there is a disconnect switch between terminal C and B+ in the open position (per instruction from Rotax to protect the b attery from discharge), with the Master switch in the =9Coff=9D position should I be measuring 12+VDC to ground on R, B+, and C rather tha n 0 VDC?? Hugh G. McKay III, P.E. Fellow. L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 Ph. 704-661-8271 Fax 704-483-5466 Email hgmckay@bellsouth.net http://www.geo.com (click on Power Division) Sent from Mail for Windows 10 ________________________________ Message 2 _____________________________________ Time: 04:22:04 PM PST US From: Dave Alberti Subject: Re: RotaxEngines-List: Rotax 912 UL Rectifier wiring You don=99t show a battery relay to that isolates the battery when all switches are off (as in shutdown) which is in the rotax install wiring diag ram. I believe that is the master that Truemper=99s speaking about. Dave Alberti 414-699-9312 > On Nov 20, 2018, at 3:46 PM, Hugh McKay wrote: > > I need some advice by anyone out there who may be able to clear up a quest ion I have concerning checking the output wiring of the standard Rotax 912 r ectifier used with the 912 UL engine. I have this rectifier on my Allegro 2 000 ELSA (912 UL engine). For additional information I am attaching my airpl ane wiring one line diagram that shows how my rectifier is wired. Also I wan t to make reference to a Blog article authored by Klaus Truemper titled =9C18 December 2012 Testing Rotax 912/914 Generator and Rectifier=9D. Y ou can Google the title and read the article. > > In the section of Mr. Truemper=99s article (Testing Regulator/Rectif ier) where he states =9CWith the Master switch off: The above test (re ferring to the previous paragraph) should show 0 voltage for all three cases . I do not know what Mr. Truemper=99s wiring diagram looked like becau se he did not offer one in his article. > > After reading Mr. Truemper=99s article and because of some perceived battery charging issues I was having with my airplane I thought I would che ck my rectifier according to his instructions in the article section titled ( Testing Regulator/Rectifier). All the tests he listed (the same ones I did) f ell within the values stated in his article except those tested with the Mas ter switch =9Coff=9D. In my case, with the Master switch =9C off=9D the voltage to ground on R, B+, and C each measured 12.7 VDC in stead of 0 VDC. > > Again I don=99t have Mr. Truemper=99s wiring diagram, but in t he wiring diagram shown in the Rotax 912 UL engine installation manual their wiring diagram indicates that there will be regular 12 VDC battery voltage o n R, B+, and C when the master switch is =9Coff=9D. > > My question is this: Assuming there is a disconnect switch between termina l C and B+ in the open position (per instruction from Rotax to protect the b attery from discharge), with the Master switch in the =9Coff=9D p osition should I be measuring 12+VDC to ground on R, B+, and C rather than 0 VDC?? > > Hugh G. McKay III, P.E. Fellow. L.M. ASCE > Senior Consultant > Worldwide Engineering Inc. > 4090 North NC Hwy. 16 > Denver, NC 28037 > > Ph. 704-661-8271 > Fax 704-483-5466 > Email hgmckay@bellsouth.net > http://www.geo.com (click on Power Division) > Sent from Mail for Windows 10 > > ________________________________ Message 3 _____________________________________ Time: 06:01:16 PM PST US From: Hugh McKay Subject: RE: RotaxEngines-List: Rotax 912 UL Rectifier wiring Dave, My battery is manually isolated by Breaker 13 shown within the =9Cclo ud=9D noted as Rev.#1 on the attached one line (better drawing than w hat I sent previous). All the Breakers mounted on the panel including Break er 13 are Potter & Brumfield W23 Push Button Thermal circuit breakers that can also be used as manual isolation switches. I assumed the term =9C Master Switch=9D as used by Mr. Truemper meant the =9CIgnition Switch=9D as seen on my one line. With that switch in the =9Cof f=9D position and Breaker 13 open the voltage to ground on R, B+, and C each measured 12.7 VDC in stead of 0 VDC. This is the same wiring arrang ement as shown in the Rotax 912 Installation Manual, page 46 of 66 Dated 19 97 03 26. Unless I am =9Csomewhere lost in translation=9D, If M r. Truemper has his engine wired according to the Rotax manual (which is th e same as mine, he should also be reading the voltage to ground on R, B+, a nd C each as 12+ VDC in stead of 0 VDC Having said all this, have I lost my mind?? According to the attached one l ine is my electrical system wired correctly???? Hugh G. McKay III, P.E. Fellow. L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 Ph. 704-661-8271 Fax 704-483-5466 Email hgmckay@bellsouth.net http://www.geo.com (click on Power Division) Sent from Mail for Windows 10 From: Dave Alberti Sent: Tuesday, November 20, 2018 7:23 PM Subject: Re: RotaxEngines-List: Rotax 912 UL Rectifier wiring You don=99t show a battery relay to that isolates the battery when al l switches are off (as in shutdown) which is in the rotax install wiring di agram. =C2-I believe that is the master that =C2-Truemper=99s spe aking about. Dave Alberti 414-699-9312 On Nov 20, 2018, at 3:46 PM, Hugh McKay wrote: I need some advice by anyone out there who may be able to clear up a questi on I have concerning checking the output wiring of the standard Rotax 912 r ectifier used with the 912 UL engine. I have this rectifier on my =C2-All egro 2000 ELSA (912 UL engine). For additional information I am attaching m y airplane wiring one line diagram that shows how my rectifier is wired. Al so I want to make reference to a Blog article authored by Klaus Truemper ti tled =9C18 December 2012 Testing Rotax 912/914 Generator and Rectifie r=9D. You can Google the title and read the article. =C2- In the section of Mr. Truemper=99s article (Testing Regulator/Rectifi er) where he states =9CWith the Master switch off: The above test (re ferring to the previous paragraph) should show 0 voltage for all three case s. I do not know what Mr. Truemper=99s wiring diagram looked like bec ause he did not offer one in his article. =C2- After reading Mr. Truemper=99s article and because of some perceived battery charging issues I was having with my airplane I thought I would che ck my rectifier according to his instructions in the article section titled (Testing Regulator/Rectifier). All the tests he listed (the same ones I di d) fell within the values stated in his article except those tested with th e Master switch =9Coff=9D. In my case, with the Master switch =9Coff=9D the voltage to ground on R, B+, and C each measured 1 2.7 VDC in stead of 0 VDC. =C2- Again I don=99t have Mr. Truemper=99s wiring diagram, but in th e wiring diagram shown in the Rotax 912 UL engine installation manual their wiring diagram indicates that there will be regular 12 VDC battery voltage on R, B+, and C when the master switch is =9Coff=9D. =C2- My question is this: Assuming there is a disconnect switch between terminal C and B+ in the open position (per instruction from Rotax to protect the b attery from discharge), with the Master switch in the =9Coff=9D position should I be measuring 12+VDC to ground on R, B+, and C rather tha n 0 VDC?? =C2- Hugh G. McKay III, P.E. Fellow. L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 =C2- Ph. 704-661-8271 Fax 704-483-5466 Email hgmckay@bellsouth.net http://www.geo.com (click on Power Division) Sent from Mail for Windows 10 =C2- ________________________________ Message 4 _____________________________________ Time: 06:39:54 PM PST US From: Dave Alberti Subject: Re: RotaxEngines-List: Rotax 912 UL Rectifier wiring Hugh, that does not isolate the battery, the rotax drawing drops at relay 19 and takes all voltage off the regulator at B+ and R. Dave Alberti 414-699-9312 > On Nov 20, 2018, at 7:59 PM, Hugh McKay wrote: > > Dave, > > My battery is manually isolated by Breaker 13 shown within the =9Ccl oud=9D noted as Rev.#1 on the attached one line (better drawing than w hat I sent previous). All the Breakers mounted on the panel including Breake r 13 are Potter & Brumfield W23 Push Button Thermal circuit breakers that ca n also be used as manual isolation switches. I assumed the term =9CMas ter Switch=9D as used by Mr. Truemper meant the =9CIgnition Swit ch=9D as seen on my one line. With that switch in the =9Coff =9D position and Breaker 13 open the voltage to ground on R, B+, and C each m easured 12.7 VDC in stead of 0 VDC. This is the same wiring arrangement as s hown in the Rotax 912 Installation Manual, page 46 of 66 Dated 1997 03 26. U nless I am =9Csomewhere lost in translation=9D, If Mr. Truemper h as his engine wired according to the Rotax manual (which is the same as mine , he should also be reading the voltage to ground on R, B+, and C each as 12 + VDC in stead of 0 VDC > > Having said all this, have I lost my mind?? According to the attached one l ine is my electrical system wired correctly???? > > > Hugh G. McKay III, P.E. Fellow. L.M. ASCE > Senior Consultant > Worldwide Engineering Inc. > 4090 North NC Hwy. 16 > Denver, NC 28037 > > Ph. 704-661-8271 > Fax 704-483-5466 > Email hgmckay@bellsouth.net > http://www.geo.com (click on Power Division) > Sent from Mail for Windows 10 > > From: Dave Alberti > Sent: Tuesday, November 20, 2018 7:23 PM > To: rotaxengines-list@matronics.com > Subject: Re: RotaxEngines-List: Rotax 912 UL Rectifier wiring > > You don=99t show a battery relay to that isolates the battery when a ll switches are off (as in shutdown) which is in the rotax install wiring di agram. I believe that is the master that Truemper=99s speaking about .. > > Dave Alberti > 414-699-9312 > > On Nov 20, 2018, at 3:46 PM, Hugh McKay wrote: > > I need some advice by anyone out there who may be able to clear up a quest ion I have concerning checking the output wiring of the standard Rotax 912 r ectifier used with the 912 UL engine. I have this rectifier on my Allegro 2 000 ELSA (912 UL engine). For additional information I am attaching my airpl ane wiring one line diagram that shows how my rectifier is wired. Also I wan t to make reference to a Blog article authored by Klaus Truemper titled =9C18 December 2012 Testing Rotax 912/914 Generator and Rectifier=9D. Y ou can Google the title and read the article. > > In the section of Mr. Truemper=99s article (Testing Regulator/Rectif ier) where he states =9CWith the Master switch off: The above test (re ferring to the previous paragraph) should show 0 voltage for all three cases . I do not know what Mr. Truemper=99s wiring diagram looked like becau se he did not offer one in his article. > > After reading Mr. Truemper=99s article and because of some perceived battery charging issues I was having with my airplane I thought I would che ck my rectifier according to his instructions in the article section titled ( Testing Regulator/Rectifier). All the tests he listed (the same ones I did) f ell within the values stated in his article except those tested with the Mas ter switch =9Coff=9D. In my case, with the Master switch =9C off=9D the voltage to ground on R, B+, and C each measured 12.7 VDC in stead of 0 VDC. > > Again I don=99t have Mr. Truemper=99s wiring diagram, but in t he wiring diagram shown in the Rotax 912 UL engine installation manual their wiring diagram indicates that there will be regular 12 VDC battery voltage o n R, B+, and C when the master switch is =9Coff=9D. > > My question is this: Assuming there is a disconnect switch between termina l C and B+ in the open position (per instruction from Rotax to protect the b attery from discharge), with the Master switch in the =9Coff=9D p osition should I be measuring 12+VDC to ground on R, B+, and C rather than 0 VDC?? > > Hugh G. McKay III, P.E. Fellow. L.M. ASCE > Senior Consultant > Worldwide Engineering Inc. > 4090 North NC Hwy. 16 > Denver, NC 28037 > > Ph. 704-661-8271 > Fax 704-483-5466 > Email hgmckay@bellsouth.net > http://www.geo.com (click on Power Division) > Sent from Mail for Windows 10 > > > > ________________________________ Message 5 _____________________________________ Time: 08:32:34 PM PST US From: Hugh McKay Subject: RE: RotaxEngines-List: Rotax 912 UL Rectifier wiring Dave, Thanks for your clarification of the Rotax instruction concerning disconnec ting the battery. I went back and read a similar article by Phil Lockwood c alled =9CTips and Tricks for the Ideal Rotax 912 Installation =9D published in 2005. In that article he clearly states that the + battery wire that is connected to R, B+, and C must be disconnected from the batte ry. Based on my wiring one line drawing where would you recommend I move Br eaker 13 to isolate the battery, and should I change the breaker to a large r amp rating? Hugh G. McKay III, P.E. Fellow. L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 Ph. 704-661-8271 Fax 704-483-5466 Email hgmckay@bellsouth.net http://www.geo.com (click on Power Division) Sent from Mail for Windows 10 From: Dave Alberti Sent: Tuesday, November 20, 2018 9:41 PM Subject: Re: RotaxEngines-List: Rotax 912 UL Rectifier wiring Hugh, that does not isolate the battery, the rotax drawing drops at relay 1 9 and takes all voltage off the regulator at B+ and R. =C2- Dave Alberti 414-699-9312 On Nov 20, 2018, at 7:59 PM, Hugh McKay wrote: Dave, =C2- My battery is manually isolated by Breaker 13 shown within the =9Cclo ud=9D noted as Rev.#1 on the attached one line (better drawing than w hat I sent previous). All the Breakers mounted on the panel including Break er 13 are Potter & Brumfield W23 Push Button Thermal circuit breakers that can also be used as manual isolation switches. I assumed the term =9C Master Switch=9D as used by Mr. Truemper meant the =9CIgnition Switch=9D as seen on my one line. With that switch in the =9Cof f=9D position and Breaker 13 open the voltage to ground on R, B+, and C each measured 12.7 VDC in stead of 0 VDC. This is the same wiring arrang ement as shown in the Rotax 912 Installation Manual, page 46 of 66 Dated 19 97 03 26. Unless I am =9Csomewhere lost in translation=9D, If M r. Truemper has his engine wired according to the Rotax manual (which is th e same as mine, he should also be reading the voltage to ground on R, B+, a nd C each as 12+ VDC in stead of 0 VDC =C2- Having said all this, have I lost my mind?? According to the attached one l ine is my electrical system wired correctly???? =C2- =C2- Hugh G. McKay III, P.E. Fellow. L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 =C2- Ph. 704-661-8271 Fax 704-483-5466 Email hgmckay@bellsouth.net http://www.geo.com (click on Power Division) Sent from Mail for Windows 10 =C2- From: Dave Alberti Sent: Tuesday, November 20, 2018 7:23 PM Subject: Re: RotaxEngines-List: Rotax 912 UL Rectifier wiring =C2- You don=99t show a battery relay to that isolates the battery when al l switches are off (as in shutdown) which is in the rotax install wiring di agram. =C2-I believe that is the master that =C2-Truemper=99s spe aking about. Dave Alberti 414-699-9312 On Nov 20, 2018, at 3:46 PM, Hugh McKay wrote: I need some advice by anyone out there who may be able to clear up a questi on I have concerning checking the output wiring of the standard Rotax 912 r ectifier used with the 912 UL engine. I have this rectifier on my =C2-All egro 2000 ELSA (912 UL engine). For additional information I am attaching m y airplane wiring one line diagram that shows how my rectifier is wired. Al so I want to make reference to a Blog article authored by Klaus Truemper ti tled =9C18 December 2012 Testing Rotax 912/914 Generator and Rectifie r=9D. You can Google the title and read the article. =C2- In the section of Mr. Truemper=99s article (Testing Regulator/Rectifi er) where he states =9CWith the Master switch off: The above test (re ferring to the previous paragraph) should show 0 voltage for all three case s. I do not know what Mr. Truemper=99s wiring diagram looked like bec ause he did not offer one in his article. =C2- After reading Mr. Truemper=99s article and because of some perceived battery charging issues I was having with my airplane I thought I would che ck my rectifier according to his instructions in the article section titled (Testing Regulator/Rectifier). All the tests he listed (the same ones I di d) fell within the values stated in his article except those tested with th e Master switch =9Coff=9D. In my case, with the Master switch =9Coff=9D the voltage to ground on R, B+, and C each measured 1 2.7 VDC in stead of 0 VDC. =C2- Again I don=99t have Mr. Truemper=99s wiring diagram, but in th e wiring diagram shown in the Rotax 912 UL engine installation manual their wiring diagram indicates that there will be regular 12 VDC battery voltage on R, B+, and C when the master switch is =9Coff=9D. =C2- My question is this: Assuming there is a disconnect switch between terminal C and B+ in the open position (per instruction from Rotax to protect the b attery from discharge), with the Master switch in the =9Coff=9D position should I be measuring 12+VDC to ground on R, B+, and C rather tha n 0 VDC?? =C2- Hugh G. McKay III, P.E. Fellow. L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 =C2- Ph. 704-661-8271 Fax 704-483-5466 Email hgmckay@bellsouth.net http://www.geo.com (click on Power Division) Sent from Mail for Windows 10 =C2- =C2- ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.