Home » Public Forums » GMCnet » Bridge Rectifier
| Bridge Rectifier [message #83752] |
Sun, 09 May 2010 00:44  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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I've ordered a bridge rectifier to resurrect my onan. I see the good documentation on the photo site but I'm not sure how to tell the terminals apart.
The original has a "-" sign on one terminal and the new one has a "+" sign on one terminal. Other than that I can't tell up from down. The original could be inserted in any orientation -the new ones must have their pins bent to fit in the connector.
Frankly I'm not really sure what a bridge rectifier does except that it's a bunch of diodes. I sure would appreciate some sage advice.
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Bridge Rectifier [message #83756 is a reply to message #83752] |
Sun, 09 May 2010 01:17  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Let me know if you get a rectifier that fits correctly without modification.
On Sat, May 8, 2010 at 10:44 PM, Larry Davick <ljdavick@comcast.net> wrote:
>
>
> I've ordered a bridge rectifier to resurrect my onan. I see the good documentation on the photo site but I'm not sure how to tell the terminals apart.
>
> The original has a "-" sign on one terminal and the new one has a "+" sign on one terminal. Other than that I can't tell up from down. The original could be inserted in any orientation -the new ones must have their pins bent to fit in the connector.
>
> Frankly I'm not really sure what a bridge rectifier does except that it's a bunch of diodes. I sure would appreciate some sage advice.
> --
> Larry Davick
> The Mystery Machine
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Bridge Rectifier [message #83776 is a reply to message #83772] |
Sun, 09 May 2010 07:12 |
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Tangerine
Messages: 192
Registered: February 2004
Location: Livonia, MI
Karma: 0
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Senior Member |
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How can you tell which wire goes on the (-) & (+) terminals?? Are the other
2 polarity sensitive? I did not mark the wires as I removed them. There are
4 wires, 2 are a little heavier than the other 2. I have tried them oposite
corners and I get nothing on the output.
Gary W. Mills (Livonia MI)
. ___________
./_][__][] []| 1974 GMC M/H
.*O-------OO-* Painted Desert
"Tangerine Dream" W/New Frame
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org]On Behalf Of Ken Henderson
Sent: Sunday, May 09, 2010 8:02 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Bridge Rectifier
Larry,
The terminal diagonally opposite the (-) is the (+). Look at that (-) VERY
carefully because I don't think I've ever seen a bridge marked on the
negative terminal and not the positive.
Ken H.
Americus, GA
'76 X-Birchaven
www.gmcwipersetc.com
On Sun, May 9, 2010 at 1:44 AM, Larry Davick <ljdavick@comcast.net> wrote:
>
>
> I've ordered a bridge rectifier to resurrect my onan. I see the good
> documentation on the photo site but I'm not sure how to tell the terminals
> apart.
>
> The original has a "-" sign on one terminal and the new one has a "+" sign
> on one terminal. Other than that I can't tell up from down. The
original
> could be inserted in any orientation -the new ones must have their pins
bent
> to fit in the connector.
>
> Frankly I'm not really sure what a bridge rectifier does except that it's
a
> bunch of diodes. I sure would appreciate some sage advice.
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
1974 GMC 260
Tangerine Dream
Livonia Michigan
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| Re: [GMCnet] Bridge Rectifier [message #83785 is a reply to message #83752] |
Sun, 09 May 2010 11:36 |
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Larry, the + is DIAGONALLY opposite to the - on your old one. If you
need help installing, let me know and I can
come down. You MAY have to rotate some of the terminals to get them to
fit the connector. I can help you with that.
tt
On 5/8/2010 10:44 PM, Larry Davick wrote:
>
> I've ordered a bridge rectifier to resurrect my onan. I see the good documentation on the photo site but I'm not sure how to tell the terminals apart.
>
> The original has a "-" sign on one terminal and the new one has a "+" sign on one terminal. Other than that I can't tell up from down. The original could be inserted in any orientation -the new ones must have their pins bent to fit in the connector.
>
> Frankly I'm not really sure what a bridge rectifier does except that it's a bunch of diodes. I sure would appreciate some sage advice.
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Terry Taylor
'74 ex-Eleganza SE
San Lorenzo, CA
http://www.n6mon.org
http://dldesignstore.com
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| Re: Bridge Rectifier [message #83790 is a reply to message #83752] |
Sun, 09 May 2010 12:44 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| ljdavick wrote on Sat, 08 May 2010 22:44 |
I've ordered a bridge rectifier to resurrect my onan. I see the good documentation on the photo site but I'm not sure how to tell the terminals apart.
The original has a "-" sign on one terminal and the new one has a "+" sign on one terminal. Other than that I can't tell up from down. The original could be inserted in any orientation -the new ones must have their pins bent to fit in the connector.
Frankly I'm not really sure what a bridge rectifier does except that it's a bunch of diodes. I sure would appreciate some sage advice.
|
Earlier I replied to a post about this:
<http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=73712&rid=153#msg_73712>
| Quote: |
... In relatively non-technical terms, this is how I understand it works: (Engineers might laugh, but I am a tech... this is how it works inside my head!)
You need a magnetic field to generate electricity. Big permanent magnets are not suitable for portable generators for many reasons so an electromagnet is used. A small amount of the OUTPUT of the generator is used to power this magnet. The compounding reactor is what taps this power. It sends an AC voltage to the Bridge Rectifier where it gets converted into a DC voltage. This DC voltage is applied to the field windings to create the electromagnetic field.
The thyrector in the compounding reactor works as a voltage regulator varying the strength of the magnetic field by varying the power being sent to the field windings. (It is my understanding thyrectors "never" go bad.)
I am sure you noticed that we are using the output to make something that we need to make the output!
Normally there should be enough residual magnetism to get the generator started putting out a low voltage to "feed back" into the field. ...
|
IIRC, the field windings are connected through a male to male spade connectors. It DOES make a difference which one is positive (+) and negative (-). They are 180* opposite each other on most (but not all) bridge rectifiers. I put a small red and black wire ties on them before taking it apart. I do not think it will HURT anything if connected backwards... it just will not work. You have a 50/50 chance of getting it right.
The original one from my 4k also has a "-" sign but no "+". All the new ones I have seen mark at least the "+" terminal.
The other connectors are the AC power input, One from the compounding reactor, the other comes off one of the brushes. As these are AC voltage, they can be swapped and work just fine.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Bridge Rectifier [message #83870 is a reply to message #83790] |
Mon, 10 May 2010 01:02 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Since the bridge rectifiers were so cheap I bought 4. Maybe I'll get it right before I run out ;~)
Larry Davick
The Mystery Mahcine
On May 9, 2010, at 10:44 AM, Mike Miller wrote:
>
>
> ljdavick wrote on Sat, 08 May 2010 22:44
>> I've ordered a bridge rectifier to resurrect my onan. I see the good documentation on the photo site but I'm not sure how to tell the terminals apart.
>>
>> The original has a "-" sign on one terminal and the new one has a "+" sign on one terminal. Other than that I can't tell up from down. The original could be inserted in any orientation -the new ones must have their pins bent to fit in the connector.
>>
>> Frankly I'm not really sure what a bridge rectifier does except that it's a bunch of diodes. I sure would appreciate some sage advice.
>
>
> Earlier I replied to a post about this:
>
> <http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=73712&rid=153#msg_73712>
>
> Quote:
>> ... In relatively non-technical terms, this is how I understand it works: (Engineers might laugh, but I am a tech... this is how it works inside my head!)
>>
>> You need a magnetic field to generate electricity. Big permanent magnets are not suitable for portable generators for many reasons so an electromagnet is used. A small amount of the OUTPUT of the generator is used to power this magnet. The compounding reactor is what taps this power. It sends an AC voltage to the Bridge Rectifier where it gets converted into a DC voltage. This DC voltage is applied to the field windings to create the electromagnetic field.
>>
>> The thyrector in the compounding reactor works as a voltage regulator varying the strength of the magnetic field by varying the power being sent to the field windings. (It is my understanding thyrectors "never" go bad.)
>>
>> I am sure you noticed that we are using the output to make something that we need to make the output!
>>
>> Normally there should be enough residual magnetism to get the generator started putting out a low voltage to "feed back" into the field. ...
>
>
> IIRC, the field windings are connected through a male to male spade connectors. It DOES make a difference which one is positive (+) and negative (-). They are 180* opposite each other on most (but not all) bridge rectifiers. I put a small red and black wire ties on them before taking it apart. I do not think it will HURT anything if connected backwards... it just will not work. You have a 50/50 chance of getting it right.
>
> The original one from my 4k also has a "-" sign but no "+". All the new ones I have seen mark at least the "+" terminal.
>
> The other connectors are the AC power input, One from the compounding reactor, the other comes off one of the brushes. As these are AC voltage, they can be swapped and work just fine.
> --
> Mike Miller
> `73 26' X Painted D.
> `78 23' Birchaven
> Hillsboro, OR
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Bridge Rectifier [message #86611 is a reply to message #86607] |
Sun, 30 May 2010 12:59 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Jim,
No luck finding one. I took a different approach that might come back to bite me in the butt. I made 4 little jumpers twisted to the correct orientation.
Here is why I think it might bite me in the butt:
I used 14ga wire without knowing for certain what is needed.
Crimps may corrode over time or even come loose.
Bridge Rectifier no longer mounted to the Onan frame. Heat sink issue?
Here is why I did it this way:
I tried twisting the lugs but was never confident that the were fully seated in the connector.
Pulling the connectors out of the wiring harness looked to be a PIA!
Its a solution I understood and could easily do.
If a better solution comes up I'll jump on it!
Larry Davick
The Mystery Machine
On May 30, 2010, at 10:27 AM, Jim Kanomata <jimkanomata@gmail.com> wrote:
> Larry where did you locate the part that plugs in without modification?
>
> On Sat, May 29, 2010 at 10:45 PM, Larry Davick <ljdavick@comcast.net> wrote:
>>
>>
>> As usual, you-all were right. When I mentioned that the Onan wasn't making any power you said BRIDGE RECTIFIER! I've replace the bridge rectifier with instructions from the Onan manual and she's putting out again!
>>
>> Somehow that doesn't sound right...
>>
>> It works again, and I have the help of many of you to thank.
>>
>> Thank you!
>> --
>> Larry Davick
>> The Mystery Machine
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Bridge Rectifier [message #86612 is a reply to message #86611] |
Sun, 30 May 2010 13:35 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| ljdavick wrote on Sun, 30 May 2010 13:59 |
Jim,
No luck finding one. I took a different approach that might come back to bite me in the butt. I made 4 little jumpers twisted to the correct orientation.
Here is why I think it might bite me in the butt:
I used 14ga wire without knowing for certain what is needed.
Crimps may corrode over time or even come loose.
Bridge Rectifier no longer mounted to the Onan frame. Heat sink issue?
Here is why I did it this way:
I tried twisting the lugs but was never confident that the were fully seated in the connector.
Pulling the connectors out of the wiring harness looked to be a PIA!
Its a solution I understood and could easily do.
If a better solution comes up I'll jump on it!
Larry Davick
The Mystery Machine
|
Larry,
The bridge rectifier current is in the 2~4amp region.
-> 14awg is plenty
The original plastic block is no kind of protection.
-> So corrosion will be no more of an issue now. Crimps are pretty reliable.
The original mounting was no kind of heat sink and it still should not be required at field current loads.
I tried twisting the lugs, too, and came to the same conclusion.
Pulling the connectors out of the holder isn't that tough - if you have a little teeny-tiny screw driver.
If you know what you did and it works, You scored.
The BG Micro part <http://www.bgmicro.com/DIO1024.aspx>
might be a plug in, but I already had a bridge in my parts box.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Bridge Rectifier [message #86614 is a reply to message #86612] |
Sun, 30 May 2010 13:59 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Thank you for the correct unit. Even Onan supplies the wrong ones.
On Sun, May 30, 2010 at 11:35 AM, Matt Colie <mcolie@chartermi.net> wrote:
>
>
> ljdavick wrote on Sun, 30 May 2010 13:59
>> Jim,
>>
>> No luck finding one. I took a different approach that might come back to bite me in the butt. I made 4 little jumpers twisted to the correct orientation.
>>
>> Here is why I think it might bite me in the butt:
>> I used 14ga wire without knowing for certain what is needed.
>> Crimps may corrode over time or even come loose.
>> Bridge Rectifier no longer mounted to the Onan frame. Heat sink issue?
>>
>> Here is why I did it this way:
>> I tried twisting the lugs but was never confident that the were fully seated in the connector.
>> Pulling the connectors out of the wiring harness looked to be a PIA!
>> Its a solution I understood and could easily do.
>>
>> If a better solution comes up I'll jump on it!
>>
>> Larry Davick
>> The Mystery Machine
>
> Larry,
> The bridge rectifier current is in the 2~4amp region.
> -> 14awg is plenty
> The original plastic block is no kind of protection.
> -> So corrosion will be no more of an issue now. Crimps are pretty reliable.
> The original mounting was no kind of heat sink and it still should not be required at field current loads.
> I tried twisting the lugs, too, and came to the same conclusion.
> Pulling the connectors out of the holder isn't that tough - if you have a little teeny-tiny screw driver.
> If you know what you did and it works, You scored.
>
> The BG Micro part <http://www.bgmicro.com/DIO1024.aspx>
> might be a plug in, but I already had a bridge in my parts box.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan - DTW 3.2/4R
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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