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+--- Thread: Let's See Your Shop (/thread-22.html)
RE: Let's See Your Shop - EdK - 12-11-2013
(12-11-2013, 12:42 PM)Shawn Wrote: I did consider the VFD but I need to run a step up transformer to go from 220 to 440 volt. ...
...
Shawn
Shawn,
What do you need the 440 volts for?
Ed
RE: Let's See Your Shop - stevec - 12-11-2013
Ed, I believe the lathe motor and the coolant pump motors are 440V 3phase. I was just typing out a long reply to him with pics and I clicked something with my sausages and POOF! lost it all.
If you see this Shawn, be patient, I'll start it all over as soon as I get a drink.
RE: Let's See Your Shop - stevec - 12-11-2013
(12-11-2013, 12:42 PM)Shawn Wrote: I did consider the VFD but I need to run a step up transformer to go from 220 to 440 volt. There is also a three phase coolant pump
Well I guess that pretty well rules out a VFD.
I checked out the Smart & Brown 1024 VSL on Tony Griffiths site
Smart&Brown
That looks like one heckofa lathe. Reminds me a bit of my Hendey tool & gauge makers lathe.
[attachment=7398]
The lathe is no more but the transformers that stepped up my 220V to it's 440V requirements are still in inventory.
[attachment=7396] [attachment=7397]
The Xfmrs weigh about 22lbs. each.
They appear to be 220 or 440V step-down to 110V secondary but I'm sure their 110V secondaries were wired in series for 220V input and the 440V primaries were wired in parallel for 440V output.
Surely someone like Ed. could tell us if this is possible.
Do you know what the current draw the lathe might produce/require.
I'm not sure what 2hp@ 440V 3 phase motor plus the coolant pump draws.
BTW Shawn could you amend your personal profile to indicate your general whereabouts (i.e. city) are in Canada?
RE: Let's See Your Shop - Shawn - 12-11-2013
My 1024 is the newer square headstock model. I'm not sure what the draw on the motor would be or even how to find out, unless it's on the data plate. The shop I bought the lathe from threw in the transformer that it was running on so all I need to do now is get the RPC. I will post a few photos of my lathe tonight.
Shawn
RE: Let's See Your Shop - stevec - 12-11-2013
Shawn, glad you have the transformer already. God knows how much it would cost to send 44 pounds of transformers to Kamloops even if the reverse wiring idea would work.
Looking forward to the lathe pics.
RE: Let's See Your Shop - EdK - 12-11-2013
(12-11-2013, 03:43 PM)stevec Wrote: ...
The Xfmrs weigh about 22lbs. each.
They appear to be 220 or 440V step-down to 110V secondary but I'm sure their 110V secondaries were wired in series for 220V input and the 440V primaries were wired in parallel for 440V output.
Surely someone like Ed. could tell us if this is possible.
...
Close Steve. The primary windings are wired in parallel for 220V input or in series for 440V input. The 110V secondary is only for driving the controls and not the motor. But you probably already knew that.
Ed
RE: Let's See Your Shop - stevec - 12-11-2013
Ed, according to this name plate, which are the primary/input contacts and which are the secondary?
http://www.metalworkingfun.com/attachment.php?thumbnail=7396
Doesn't "220/440 - 110 VOLTS" mean 220 or 440 in(pri.) - 110v out (sec.)?
I'll continue once I get your reply. I'm obviously not expressing myself clearly and I'd like to work this out even if there is no longer any interest/need for Shawn.
RE: Let's See Your Shop - EdK - 12-12-2013
(12-11-2013, 06:41 PM)stevec Wrote: ...
Doesn't "220/440 - 110 VOLTS" mean 220 or 440 in(pri.) - 110v out (sec.)?
...
Steve,
Yes, and that's what I said.
The two top coils are the primary and the bottom coil is the secondary. Put the two top coils in parallel if you are feeding them with 220V and put them in series if you're feeding them with 440V. Clear as mud?
Ed
RE: Let's See Your Shop - stevec - 12-12-2013
It's clear this morning Ed. I musta been too far into my homemade beer last night when I read your post.
Okay, so now, what do you think of feeding 110V into the secondary and using 220V or 440V from the primaries?
And, if that's not suicidal, what about wiring the secondaries (110V) in series so you could feed 220V in and using the 440V primaries wired in parallel for a 440 volt output.
And, if it is possible, what load might the 440 V output(now) sustain?
RE: Let's See Your Shop - EdK - 12-12-2013
(12-12-2013, 07:38 AM)stevec Wrote: ...
Okay, so now, what do you think of feeding 110V into the secondary and using 220V or 440V from the primaries?
It's not recommended. Typically it will heat up the transformer. I've seen it done with very low currents but it's not worth the risk.
stevec Wrote:And, if that's not suicidal, what about wiring the secondaries (110V) in series so you could feed 220V in and using the 440V primaries wired in parallel for a 440 volt output.
Not feasible since there's only one secondary coil.
Ed