OP
motofool33
Well-known member
so since it seems everyone says i should switch the motor instead of try a phase converter where do you guys get your motors oher then used.
Phase converters
- Thread starter motofool33
- Start date
I did not/would not say that.
I say build a rotary phase converter for the compressor.. Unless you have vast sums of money you want to spend on another motor. Or really vast sums to spend on a VFD
Regards,
404
sberry
Banned
I can or could and don't. Just don't want the extra layer of equipment. As a side question,,, I always want to know,, most or many of these garages are modest, what would one use a 7 1/2 grinder for?
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sberry
Banned
You can work around the poco on occasion, if my effort was sincere I would want line power if it was possible, I understand the conversions for specialty stuff, I understand it as a hobby. It sounds like the welder you have works, and if its a plan to get or switch some stuff because one would like to have it and its cheaper this becomes a losing game.
You can change motors buut that's another foot down a different direction, if my goal was to get this stuff cause I needed to use it to get work done buy a running comp and plug it in, I see 1 hp grinders for 50$ and no body that ever bought a new Ironman 230 has thought they lost a nickel.
If you are in a biz where time is money in fabrication we get back to the cost of it all again but maintenance work can normally be done from 100A service. That's why all that old iron is cheap, hard to deal with it, need another layer of cords and plugs, another panel. For some this isn't a problem, some it becomes an end unto itself.
Its great to have all the tools but kind of pointless if there is no work for it.
You can change motors buut that's another foot down a different direction, if my goal was to get this stuff cause I needed to use it to get work done buy a running comp and plug it in, I see 1 hp grinders for 50$ and no body that ever bought a new Ironman 230 has thought they lost a nickel.
If you are in a biz where time is money in fabrication we get back to the cost of it all again but maintenance work can normally be done from 100A service. That's why all that old iron is cheap, hard to deal with it, need another layer of cords and plugs, another panel. For some this isn't a problem, some it becomes an end unto itself.
Its great to have all the tools but kind of pointless if there is no work for it.
sberry
Banned
I got a lot of shate, only got one machine and don't really even use it that requires larger than a 10 wire and 50A service.
Personally any time I can trade away from all that old stuff I do. I have done a couple things where I should have ran and bought a used machine that was 3 ph but that's another story. Bought my Spec 2050 thinking I would use the auto electric but have never moved it from its home port which is 240 single rural.
I not only don't want that grinder but have been coveting a new battery one. I have a Miller Maxstar I would dearly loved to have earlier in my career.
Personally any time I can trade away from all that old stuff I do. I have done a couple things where I should have ran and bought a used machine that was 3 ph but that's another story. Bought my Spec 2050 thinking I would use the auto electric but have never moved it from its home port which is 240 single rural.
I not only don't want that grinder but have been coveting a new battery one. I have a Miller Maxstar I would dearly loved to have earlier in my career.
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Option 1, a "phase converter" drive:
http://driveswarehouse.com/p-2153-pc1-250.aspx
Option 2 is a 50 HP 3-phase drive set up to run single phase input, such as:
http://driveswarehouse.com/p-2751-sj700b-370hfuf.aspx
Hitachi has a short paper on using their 3-phase drives with single-phase input:
http://www.hitachi-america.us/suppo.../AN032404-1_Rev_A_Sizing_for_Single-Phase.pdf
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bcradio
Well-known member
If you live in Murica, you have 120v/240v.
I think you should build a rotary phase converter, 15hp setup would be perfect.
jlenander
Well-known member
Nearly 50 posts and nobody has mentioned Phase Perfect? Expensive, but you get better than service specs 3 phase power that will run multiple machines simultaneously.
Lots of guys happily running picky CNC machines out of a residential garage.
The best thing is once you've got one, you can't stop yourself from finding and buying really cheap 3 phase machines!
It took me years of looking, but I found a used 20hp for ~2000$....One of my best "tools".
Lots of guys happily running picky CNC machines out of a residential garage.
The best thing is once you've got one, you can't stop yourself from finding and buying really cheap 3 phase machines!
It took me years of looking, but I found a used 20hp for ~2000$....One of my best "tools".
Single phase input VFD's do not have to be derated, but 3 phase input ones need to be derated 50%, which means for a 5 HP motor a 10 HP drive is needed, and this assumes the phase loss protection can be disabled.
If anyone is contemplating buying a ready made kit, I would recommend avoiding Phoenix Phase converters.
If anyone is contemplating buying a ready made kit, I would recommend avoiding Phoenix Phase converters.
ez-duzit
Well-known member
Would you mind elaborating? They have excellent feedback on oBoy. I bought one of their systems that has not yet been installed.
OP
motofool33
Well-known member
http://www.use-enco.com/CGI/INSRIT?PMAKA=297-3745&PMPXNO=953358&PARTPG=INLMK3
would this work for a 7.5hp 3 phase air compressor?
would this work for a 7.5hp 3 phase air compressor?
rancherbill
Well-known member
+1
It will cost a bundle in electricity to have the converter running all the time just in case the compressor comes on.
OP
motofool33
Well-known member
Gotcha, What about for a intermittant use use machine like a mill or lathe is that the proper style phase converter? seems so cheap thats why im asking.
ez-duzit
Well-known member
A static phase converter only provides ~2/3 the hp of the motor rating.