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Post by turbokinetic on Feb 27, 2019 2:27:43 GMT
Was perusing the online sell-your-junk sites while waiting on a flight this week. Found this early single-cylinder belt drive Frigidaire skid. It has been stripped of the condenser coil, receiver, and control. But, most importantly, it has a steel-weight Delco repulsion-induction motor; and a complete Frigidaire compressor pump.
The seller was in the same town very near the airport, so on the way home today, I got it.
Sincerely, David
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Post by birkie on Feb 27, 2019 3:32:42 GMT
Was perusing the online sell-your-junk sites while waiting on a flight this week. Wow, what luck! The motor itself is a great find. So what did you end up doing logistically - buy the skid, take it back with you as very unusual checked baggage?
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Post by turbokinetic on Feb 27, 2019 3:46:43 GMT
Was perusing the online sell-your-junk sites while waiting on a flight this week. Wow, what luck! The motor itself is a great find. So what did you end up doing logistically - buy the skid, take it back with you as very unusual checked baggage? Yeah, the motor was really what made the decision for me.
Sorry if it was confusing. I flew home from the West Indies, but I searched near my home and the BHM airport. So, when I arrived home in Alabama, the parts were between the airport and home so I just put it in the car.
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Post by NJ_Bill on Feb 27, 2019 6:04:56 GMT
Ahh, reminds me of the old 2 cylinder Tecumseh (I think) units I used to work on may years ago. Main difference where the ones I worked on where 110 VDC units.
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Post by turbokinetic on Feb 27, 2019 13:09:21 GMT
Ahh, reminds me of the old 2 cylinder Tecumseh (I think) units I used to work on may years ago. Main difference where the ones I worked on where 110 VDC units.
Wow! 110VDC units - that is fascinating! Cold water drinking fountain?
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Post by NJ_Bill on Feb 28, 2019 6:10:40 GMT
Wow! 110VDC units - that is fascinating! Cold water drinking fountain? 1950 - 1962 tugboats and oil barges. Barges had a 20KW 2-71 110VDC generator and a bank of 9 Grp batteries. Tugs had two 30 to 40 KW GM 3-71 gen sets and the same 9 battery bank. One tug had two banks of batteries. Not a fun job changing those out. I'd get home and throw my clothes straight in the trash. Battery acid would eat them all up. We had a small harbor oiler same 110 VDC electrical system. When ever we would get a new engineer on that bot, somehow they would reverse current the generators. I'd have to fo down, lift the brushes, and reflash the generator so positive was back positive again. Numerous times I would check and exercise the reverse current relays, do you think I could get then to reverse current??? NOOO. hehe.
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Post by turbokinetic on Feb 28, 2019 12:50:19 GMT
1950 - 1962 tugboats and oil barges. Barges had a 20KW 2-71 110VDC generator and a bank of 9 Grp batteries. Tugs had two 30 to 40 KW GM 3-71 gen sets and the same 9 battery bank. One tug had two banks of batteries. Not a fun job changing those out. I'd get home and throw my clothes straight in the trash. Battery acid would eat them all up. We had a small harbor oiler same 110 VDC electrical system. When ever we would get a new engineer on that bot, somehow they would reverse current the generators. I'd have to fo down, lift the brushes, and reflash the generator so positive was back positive again. Numerous times I would check and exercise the reverse current relays, do you think I could get then to reverse current??? NOOO. hehe. Wow, fascinating! I work on marine engines and power systems now, but haven't seen any DC main power systems like that. We do still see 110VDC power, but it is limited to the switchboard, as an uninterruptable power source for breaker tripping and spring-charge power. Most everything now is 480V 3-phase since it is more standardized with industry in general.
LOL at the ships' engineers reversing the generators. That sounds like a headache having to try an d explain that to them, as to what they did and as to why it caused a problem!
Thanks for sharing the story.
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Post by NJ_Bill on Feb 28, 2019 16:07:58 GMT
LOL at the ships' engineers reversing the generators. That sounds like a headache having to try an d explain that to them, as to what they did and as to why it caused a problem!
Thanks for sharing the story.
One project I had a few years ago on a harbor supply boat was totally rewiring it and converting it from 32 VDC to a 12 VDC system. Unfortunately the boat "Carried passengers for hire" so it was an inspected vessel by the USCG (Uncle Sam's Confused Group) The crazy inspector was pulling all sorts of rules and regs out of the CFR,s pertaining to high voltage systems. You would not believe how complex the 12 volt system ended up. ugggg..... I don't miss the big heavy 8 volt batteries though!!
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Post by turbokinetic on Mar 1, 2019 1:29:51 GMT
That's crazy about USCG having problems with a 32V system! I have had them inspect our 11,000V generators (yes, you read that right 11KV) and not say much about that even!
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Post by NJ_Bill on Mar 1, 2019 22:18:12 GMT
That's crazy about USCG having problems with a 32V system! It's actually crazier, the 32 volt system was coming out due to 32 volt equipment being made out of unobtainium. A straight forward 12 volt system was going in. Steel hull boat and the USCG mandated both the + and - legs be isolated from the hull. This required fuse protection on both the positive and negative legs to each circuit, and isolated ground starter, alternator , oil and temperature senders on the engine. Plus the installation of ground fault lights.
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Post by turbokinetic on Mar 1, 2019 22:33:19 GMT
That's crazy about USCG having problems with a 32V system! It's actually crazier, the 32 volt system was coming out due to 32 volt equipment being made out of unobtainium. A straight forward 12 volt system was going in. Steel hull boat and the USCG mandated both the + and - legs be isolated from the hull. This required fuse protection on both the positive and negative legs to each circuit, and isolated ground starter, alternator , oil and temperature senders on the engine. Plus the installation of ground fault lights.
Yep, almost all of our offshore power systems are isolated 24VDC systems, equipped as you mention with ground fault warnings. All breakers are double-pole.
Then, the 480V system is also "high resistance grounded" with ground fault warnings!
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Post by NJ_Bill on Mar 2, 2019 5:16:51 GMT
Yep, almost all of our offshore power systems are isolated 24VDC systems, equipped as you mention with ground fault warnings. All breakers are double-pole. Then, the 480V system is also "high resistance grounded" with ground fault warnings!
Best one was when the USCG wanted us to install ground fault lights on a wooden boat.
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Post by turbokinetic on Mar 2, 2019 12:23:18 GMT
Then, the 480V system is also "high resistance grounded" with ground fault warnings!
Best one was when the USCG wanted us to install ground fault lights on a wooden boat. That is funny!
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Post by ckfan on Mar 2, 2019 13:17:49 GMT
I deal with high voltage DC applications too in the solar power world. Ground faults are always fun to track down. Never had an issue with a ground fault to wood though...
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Post by elec573 on Mar 13, 2019 17:17:12 GMT
Looks like a future project or do you have a fridge in mind for your new find ?
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