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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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 Posted: Wed Aug 12, 2009 10:07 pm Post subject: Why3 different alt disconnect relay wiring in Z schematics? |
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Hello 
I am in the process of making my schematic for a Jab 3300. If I go with a master contactor, I may base it on Z-21 and if not, Z-20. While looking at these two, I noticed there were different ways to wire the alternator OV disconnect relay. And I found a 3rd way done in Z-16.
Below are listed my summaries of what the differences are. I'd like to understand why they are done this way, what the pros and cons are, and if I've misunderstood anything.
Z-16 (with a battery contactor) has one of the alternator leads connected to the ‘com’ of the alt disconnect relay and the other to the regulator. The ‘N.O.’ lead of the relay then goes to the regulator. So when the relay is closed, both leads of the alternator go to the regulator. When the relay is open, still one of the leads from the alternator is connected to the regulator. But because it's AC, and the alternator is not grounded, there is no return path, thus no current put out to the regulator.
Z-20 (without a battery contactor) has both alt leads going to the regulator first, then to the N.O. pole of the alt relay. The crowbar OVM is connected to the #4 pole of the master switch, as it is in Z-16.
Z-21(with a battery contactor) has both alternator leads going through the regulator, as in Z-20, but then goes to the ‘com’ pole of the alt disconnect relay. The relay also has the crowbar OVM connected across its coil and not to the master switch.
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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