10ee vfd questions

Latesurfrat said:

Hi guys new to the site. I just got a 1944 monarch 10ee off of cragslist. I never saw it run but was told it did. I would like to leave the MG system in tact if possible. I saw a lot of post about taking the guts out of it and just sticking a 3 phase motor in and a vfd on the machine.

Now on to my question couldn't I just put the vfd right on the 3 phase motor that runs the dc genartor?
Something like this.
TOP 22V 7.5KW 1HP 34A VFD VARIABLE FREQUENCY DRIVE INVERTER CE QUALITY | eBay

I know my other opinion is a rotary phase converter but that's a little above my budget.

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Cal Haines said:

I don't know of anyone using a VFD to power a 10EE's motor/generator (MG). If I recall correctly, not all VFDs put out a good honest 220 Volts RMS. (I want to say that 180 Volts RMS is typical). If you run the MG at too low a voltage it may overheat.

If you're on a budget, you might want to try using a so-called static phase converter (SPC). I know of several SPCs in use. Bob49 is using a 5-8HP Phase-a-Matic SPC on his 10EE:

http://www.practicalmachinist.com/v...s-other-woman-272127-post2121506/#post2121506​

An SPC is nothing more than a relay, one or more starting capacitors and perhaps includes run capacitors. If it doesn't include run capacitors, it's a good idea to add them. Here's one for $109 with free shipping. I don't know anything about this particular unit (and I have no association with this outfit):

3-1Hp Static phase converter​

They also sell run capacitors:

WNY Supply online store for AC run capacitors​

And if the time comes that you want a rotary phase converter (RPC), all you need to do is add an idler motor (any 7.5 HPish, 3-phase motor would do) and you have and RPC. Last I checked, the used price for 3-phase motors was less than $10 per HP.

Cal

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Latesurfrat said:

Hi guys new to the site. I just got a 1944 monarch 10ee off of cragslist. I never saw it run but was told it did. I would like to leave the MG system in tact if possible.

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Monarchist said:

That works. It turns almost half of the power out of the wall into noise and heat, BUT.. has the smoothest performance of any 'factory OEM' 10EE.

Dunno WHERE in MD you are, but if you'd like a 100% spare piggyback-exciter MG and a set of those training-potty seat sized Ohmite pots for it, I'd be pleased to have them carried away for the scarce space they would free-up here.

I found converting to Eurotherm/Parker-SSD Solid State DC drive more to my liking than VFD.

Also less WORK, once we finally sorted that all that change really needed was to follow the SSD's "Fine Manual" precisely.

The "Steelman-Haas" re-wire BTW doesn't so much lose power as it loses a tad to efficiency vs native 3-Phase. Even so, not a show stopper atall, as 'bespoke' as it is, it can drive the 10EE at the full 100% and a bit, output side, whereas an external general-purpose RPC usually hits the wall around 90%, even if a rather GOOD one.

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Cal Haines said:

I don't know of anyone using a VFD to power a 10EE's motor/generator (MG). If I recall correctly, not all VFDs put out a good honest 220 Volts RMS. (I want to say that 180 Volts RMS is typical). If you run the MG at too low a voltage it may overheat.

If you're on a budget, you might want to try using a so-called static phase converter (SPC). I know of several SPCs in use. Bob49 is using a 5-8HP Phase-a-Matic SPC on his 10EE:

http://www.practicalmachinist.com/v...s-other-woman-272127-post2121506/#post2121506​

An SPC is nothing more than a relay, one or more starting capacitors and perhaps includes run capacitors. If it doesn't include run capacitors, it's a good idea to add them. Here's one for $109 with free shipping. I don't know anything about this particular unit (and I have no association with this outfit):

3-1Hp Static phase converter​

They also sell run capacitors:

WNY Supply online store for AC run capacitors​

And if the time comes that you want a rotary phase converter (RPC), all you need to do is add an idler motor (any 7.5 HPish, 3-phase motor would do) and you have and RPC. Last I checked, the used price for 3-phase motors was less than $10 per HP.

Cal

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Latesurfrat said:

What is this box for what does it do?

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I'm just as lost by what all of this is for this is on the back of the machine right below the head stock

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