Large Drummond Restoration

[KaneH]

She’s in!

Now just to rebuild it and sort out some power

 

[KaneH]

Had a quick look tonight and appears the motor is a 400v 3ph unit (1hp). Any suggestions on the best and affordable way to get this up and running off of a single phase supply?

 

[eLuSiVeMiTe]

Had a quick look tonight and appears the motor is a 400v 3ph unit (1hp). Any suggestions on the best and affordable way to get this up and running off of a single phase supply?

Shows star and Delta on the plate. Looks like 240v but can't quite make out.

If so a cheap vfd and off you go.

 

[Seadog]

Looks like 240v but can't quite make out.

Are you sure? I think that's wishful thinking. I can't see anything stamped for the Delta.

 

[KaneH]

Had another quick clean. Definitely no number next to the delta, only the 400 above.

 

[eLuSiVeMiTe]

Are you sure? I think that's wishful thinking. I can't see anything stamped for the Delta.

Probably is wishful. Could almost make out a 2 and a four.

What's the connector box look like.

 

[KaneH]

Switch and connectors block..

 

[slim_boy_fat]

Had a quick look tonight and appears the motor is a 400v 3ph unit (1hp). Any suggestions on the best and affordable way to get this up and running off of a single phase supply?

I'm sure I spotted a 240V one which looks identical on Faceslap this morning, listed in Inverness.

 

[KaneH]

Got a link Slim?

Having little experience with electronics I’ve been looking through the web for info on inverters and found an article on inverter drive, see below:

https://inverterdrive.com/HowTo/240V-Supply-to-a-400V-AC-Motor/

Am I correct in saying that I could run the motor via an inverter at 230v 3ph albeit only achieving half speed (full torque)? Or does the motor require the 230v stamp on the delta as discussed above for this to be achievable?

My thought was to potentially change the speed at the lathe via a secondary pulley setup. Shout now if I’m talking nonsense!

 

[God mode restorations]

Wouldn't it be easier to just run a single phase motor. Plenty of them about a will produce more than enough grunt for the size of the machine you have

 

[slim_boy_fat]

Got a link Slim?

https://www.facebook.com/marketplace/item/557973517939960/

 

[KaneH]

That’s a decent price there Slim, thanks. Anyone local to Inverness that could potentially pick this up and hold onto it until I’m up north next? Beer tokens awaiting

 

[Pete.]

Before spending any money first take the connection box cover off the motor and look at the arrangement. Just because they don't list delta as a configuration doesn't mean the facility is not there.

 

[KaneH]

Will have a look tonight Pete but potentially £30 for a motor that will run out of the box could be a saving compared with buying a inverter for the 3 phase unit. Not sure what I’m looking for in the connector box but will post photos later for some advice.

 

[Seadog]

Regardless of the small difference in cost, the versatility that running a VFD provides is worth the expense.

 

[KaneH]

Not sure what I’m supposed to be looking for but here’s a few snaps..

First - top cover removed on motor

Second - top cover removed on control box

Third / fourth - plug

 

[slim_boy_fat]

That’s a decent price there Slim, thanks. Anyone local to Inverness that could potentially pick this up and hold onto it until I’m up north next? Beer tokens awaiting

I could if it comes to that [there's another Member closer but I can't remember his username], he may pop up soon.....

Check that it's going to be powerful enough for "a large Drummond", at an output of 180W - the ad says "suitable for a small lathe"

 

[eLuSiVeMiTe]

Regardless of the small difference in cost, the versatility that running a VFD provides is worth the expense.

All mine will go that way in the end.

1.5hp and a cheap vfd.

 

[Seadog]

First - top cover removed on motor

Which shows what we'd normally expect to see with a 3-phase star configured motor. That is just three wires.

Without going to the expense of a 415v vfd you'd need to open the motor to find the star point so that it can be reqired for 230v delta operation.

 

[KaneH]

Without going to the expense of a 415v vfd you'd need to open the motor to find the star point so that it can be reqired for 230v delta operation.

I’d briefly read about this yesterday. Has anyone on here done a write up on here if the procedure? Or are there any guides online that take you through it?

I’m happy enough to follow instructions but wouldn’t know where to start without any guidance