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
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| Subject: | 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
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| Subject: | Re: 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 <hgmckay@bellsouth.net> 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
>
> <Electrical wiring one-line Diagram.pdf>
Message 3
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| Subject: | 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 <hgmckay@bellsouth.net> 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-
<Electrical wiring one-line Diagram.pdf>
Message 4
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| Subject: | Re: 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 <hgmckay@bellsouth.net> 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????<D29C00CAAAD94829847618F3128C
3F05.jpg>
>
>
> 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 <hgmckay@bellsouth.net> 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
>
> <Electrical wiring one-line Diagram.pdf>
>
> <D29C00CAAAD94829847618F3128C3F05.jpg>
Message 5
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| Subject: | 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 <hgmckay@bellsouth.net> 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????<D29C00CAAAD94829847618F3128
C3F05.jpg>
=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 <hgmckay@bellsouth.net> 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-
<Electrical wiring one-line Diagram.pdf>
=C2-
<D29C00CAAAD94829847618F3128C3F05.jpg>
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