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#11
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Voltage Regulator replacement
Jay Masino wrote: What's the brand name? It was a Lamar. I didn't write down the model number. It was for a 14V aircraft, probably a Piper, meaning that the regulator sinks the field current. |
#12
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Voltage Regulator replacement
mikem wrote:
Jay Masino wrote: What's the brand name? It was a Lamar. I didn't write down the model number. It was for a 14V aircraft, probably a Piper, meaning that the regulator sinks the field current. Piper electrical systems source the field current. The other side of the field winding is connected to ground. |
#13
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Voltage Regulator replacement
Ray Andraka wrote:
mikem wrote: Jay Masino wrote: What's the brand name? It was a Lamar. I didn't write down the model number. It was for a 14V aircraft, probably a Piper, meaning that the regulator sinks the field current. Piper electrical systems source the field current. The other side of the field winding is connected to ground. My Comanche regulator grounds the field wiring. I thought most pipers were that way. |
#14
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Voltage Regulator replacement
ktbr wrote:
My Comanche regulator grounds the field wiring. I thought most pipers were that way. Well, let me clarify... grounded is for max generator output. The regulator controls the generator output by controlling "how much" it is grounded. This could be done in a pulse-width method or linear method. |
#15
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Voltage Regulator replacement
ktbr wrote:
It was a Lamar. I didn't write down the model number. It was for a 14V aircraft, probably a Piper, meaning that the regulator sinks the field current. Piper electrical systems source the field current. The other side of the field winding is connected to ground. My Comanche regulator grounds the field wiring. I thought most pipers were that way. I should have clarified. The Cherokee line uses "B" type regulators. For those, the regulator is connected between the power buss and the alternator. Higher voltage at the regulator output (average voltage for PWM regulators) yields higher alternator output. The other end of the field winding is grounded. I wasn't aware the the Commanche used the other type. |
#16
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Voltage Regulator replacement
kontiki wrote:
Has anyone replaced their Delco Remy voltage regulator (the old mechanical type for a 50 amp generator) with a new solid state type by Zeftronics? CHief aircraft sells them, just wondering what anyone's experience was. Mine is old, acting up and charging too high. In the old days I guess you could clean the contacts and so forth but I'd rather just replace it. I replaced the Delco-Remy's and paralelling relay on my PA-30 with Zeftronics, and couldn't be happier. I used to stock a spare generator and have to replace them regularly - once I installed the Zeftronics, this came to an end. Guess they don't arc as much. The installation instructions are dead simple, and they have diagnostics that tell you what is wrong. In fact, the Zeftronics regulators were my first experience ever with buying a PMA part (other than an engine part) and being able to install it exactly per instructions and having everything work without cutting, fitting, adjusting, and generally messing with it. It's a good design, IMO. I also discovered, by talking to their chief engineer, that there is someone in this world who has a lower opinion of the FAA engineering and certification people than I do. Michael |
#17
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Voltage Regulator replacement
Ray Andraka wrote: mikem wrote: It was a Lamar. I didn't write down the model number. It was for a 14V aircraft, probably a Piper, meaning that the regulator sinks the field current. Piper electrical systems source the field current. The other side of the field winding is connected to ground. I was wrong. I picked up the unit at the airport tonight. It has "PAC-484121 Voltage Regulator 14V B-00331-2 Lamar, inc. Bancocas N.J. USA" silk-screened on the cover. It is a linear regulator. It regulates in the high side (sources current to the field). If your alternator has two field terminals, you have to ground the other one..., just like my Cessna. The Lamar unit came out of a PA32. |
#18
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Voltage Regulator replacement
mikem wrote: The digital Zeftronics puts out continuous broadband RF (as opposed to the old mechanical units that put out various pops and clicks at random times The mechanical regulator operates like a buzzer. I have a couple of sim setups here I use to teach the systems, and in a dark room with the alternator operating you can see the small but constant arcing between the regulator contact points. A capacitor across field and ground kills most of the noise. The inductance of the field winding and the resistors in the regulator maintain a semblance of constant current flow even thought the points are bouncing, and the capacitor reduces the arcing that makes noise and burns the contacts. Works pretty well, even though it's primitive. I do like the constant-current regulator idea, though failure is more likely to be instant and without warning. Worn mechanical regulators will start dropping the output voltage or might stick occasionally. Dan |
#19
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Voltage Regulator replacement
"kontiki" wrote in message ... Has anyone replaced their Delco Remy voltage regulator (the old mechanical type for a 50 amp generator) with a new solid state type by Zeftronics? CHief aircraft sells them, just wondering what anyone's experience was. Mine is old, acting up and charging too high. In the old days I guess you could clean the contacts and so forth but I'd rather just replace it. Used the Zeftronics on my Cherokee 140 about 5 years ago. No issues. Works fine. Joe Schneider N8437R ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#20
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Voltage Regulator replacement
JJS wrote:
Used the Zeftronics on my Cherokee 140 about 5 years ago. No issues. Works fine. Joe Schneider N8437R Update: Installed the Zeftronics unit last week and flew out to Austin over the weekend. Unit works perfectly and makes me realize just how bad my old one was. I highly recommend these units as a replacement for the old Delco Remy antiques. |
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