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11:18 pm
NWBA Member
September 7, 2010
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This thing weighs 500 lbs, I havent figured out How I am gonna get it out of my truck yet. I picked it up for $126.00, But it has a 3 Hp, 3 phase motor. (would it be cheaper to get a converter or a new motor?) I could change the motor out with a single phase, but first... I have a question about this thing called an:
EPC Combination Line Starter and Enclosure
I assume it is not a phase converter, but I wish. It was decommissioned in '96 and sat in a warehouse till the auction.
Thank you for any feedback!
3:00 pm
August 23, 2010
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That thing is the switch - in simple terms. All it will do is start and stop electricity flowing through it, and if you change the motor you will need to buy parts for this as well. Looks $$$ I would go with a RPC and then you have 3 phase to run future equipment with no hassles.;)
11:53 pm
June 24, 2010
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I've noticed someone's selling 3HP VFDs on ebay for $120 delivered. Don't know if they're any good, or if they'll actually run a 3HP motor. But if they work, that might be the cheapest way to get the thing going. And you'd get the speed control too.
10:54 pm
NWBA Member
September 7, 2010
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Mike B;14891 wrote: I've noticed someone's selling 3HP VFDs on ebay for $120 delivered...
I checked that out,(http://cgi.ebay.com/ws/eBayISA.....0652886815)
I am hesitant.... trust issues. How does one know if these things are any good? By spending $120.oo I guess.
I got it out of the truck, that cheap HF ramp didn't collapse! This thing(buffer) is made of .375 and .500 Plate, even has a port-hole, which isn't on the port-side
...And I think I did get a "Square Deal"
11:33 pm
NWBA Member
July 9, 2010
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When I saw the words Navy Buffer the first thing that I pictured was a floor buffer. They never come with instruction. You'll figure it out. Grab the handle and hang on. Amazing how responsive they are. I know of someone trying to drive one while sitting on top of the motor. What a hoot! Don't try this at home, or anywhere with less clear space than a basketball court!
Looks like a serious pedistal buffer. The plating plant had several similar. They will wear you out pretty quickly. Good luck and have fun with it.
It may not matter but, Shipboard electrical power is 3 phase "DELTA". Not the same as shore power which is "Wye".
Jeff in Poulsbo
My son is the Blacksmith
1:47 am
NWBA Member
September 7, 2010
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J Wilson;14896 wrote: It may not matter but, Shipboard electrical power is 3 phase "DELTA". Not the same as shore power which is "Wye". Jeff in Poulsbo
So, the 3phase motor I have may not work with a VFD using "Wye"? Would it specify on the nameplate the type? I have some research to do. The plug is definitely like none I have used before. Electrons are different in the Navy.
2:07 am
NWBA Member
July 9, 2010
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That does look like a typical navy shipboard connector for use in explosive atmosphere. You can have it changed to the appropriate connector for your uses. Please check with a knowledgeable electrician. (I'm not)
Mechanical and Nuclear, are the two kinds of navy electrical power. They both "Zzzzzzapp" when released from the conductor.
Jeff
My son is the Blacksmith
2:29 am
NWBA Member
September 7, 2010
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Yes, you are correct. It was from an explosive atmosphere.
I worked in a shipyard, Groton ct., but the union wouldn't allow us welders to plug anything in, so I never saw a plug. All pneumatic tools on board ship, and we couldn't touch those either, except for a deburring tool.
Thank you for your help with figuring this out.
3:07 am
NWBA Member
April 22, 2010
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A 3 phase motor doesnt care if you give it delta or wye.
If there are any 110 or single phase 220 circuits inside, that are using only one or two of the three wires, then, yes, you dont want to connect them to a 208 leg (the "high" leg or "wild" leg on a wye supply)
So, if for instance, there is a 110 volt transformer for the mag starter, you have to make sure which leg you hook it up to- but you can still run it on either delta or wye.
And what they give you on "shore" is totally dependent on the local utility- I have had both delta and wye 3 phase drops over the years, depending on what was on the pole. Used to have a shop in Inglewood California that was all Wye, big pain-- the high leg is ONLY good for a full 3 wire 3phase hookup, so 1/3 of the breaker spots could only be used for 3 phase.
But the other shops I have had, the power company gave me delta. PSE gives me 400 amps of 3 phase right now, and its all delta.
2:57 am
March 7, 2012
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Ries, you may have your Wye and Delta confused here. Delta has the high leg not wye. Bob
3:06 am
NWBA Member
April 22, 2010
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Ok, I think you are right- old brains are full of holes, ya know. But the basic message stays the same- utilities deliver both, depending on their whim.
And actual high leg delta (hopefully I will remember now) is rarer and rarer.
But the motor still dont care- 3 phase is 3 phase.
3:56 am
NWBA Member
July 9, 2010
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As I recall, and my memory is junk, shipboard power is generated at 440 VAC, 60 Hz, 3-phase, 3-wire, delta connected, ungrounded. If or how that may affect your use when connected to Wye I do not know. CONSULT A PROFESSIONAL who understands the difference.
My son is the Blacksmith
3:17 pm
March 7, 2012
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Ries, You are dead on with thaat statement, a motor does not care if it is wye or delta. While I am a land lover and know nothing about marine power systems, I have been in the electrical business for 38 years.
J. Wilson, most but not all Delta is ungrounded. Again you guys are right on with the motor. What is vital is the 60 Hz. and the voltage must be the same. You must match the power AC or DC, as well as the number of phases. The new electronic converters work really well when you size them correctly. And with the 3 phase you can have a variable speed converter. These converters can be a little confusing to wire however for a rookie. Good luck, Bob
9:48 pm
June 24, 2010
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Since I mentioned the cheap ebay VFDs on this thread earlier, I figured I'd post about the one I broke down and ordered. Now $115 delivered for the 3HP model. I bought it to run my mini lathe with a 4-pole 1 HP motor I picked up at Quad State. I'm still playing with the settings, but it seems to be working fine. This morning I used the lathe to drill a deep 1/2" hole. I had the VFD at 8 HZ (about 200 RPM on motor) and a 1.5 to 1 drive ratio. I could stall the motor, but the lathe drilled fine as long as I was careful with the feed pressure. I've figured out a way to easily go to a 3 to 1 ratio, and will do that. I've also adjusted the VFD for more voltage at low RPMs. There's still a lot of adjustment left, but I don't want to over do it.
If you google the VFD (Huanyang), there are quite a few complaints online. But they seem to be mostly from people who expected it to run a 400 HZ router spindle without adjusting the settings. It does appear that a braking resistor might not work if I added one. The built it electronic braking works fine, though. And the manual isn't translated that well -- is there gambling in this establishment? I thought about trying to track down one in the original Chinese, but I'd end up serving breakfast in bed for a month. I did figure out how to hook up a remote switch without too much trouble.
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