[Al_The_Man]

That's the one.
Al.

[hub]

For reversal, usually both ends of both windings are brought out, 4 wires.
If the motor is made uni-directional, the 'common' end of each winding is connected internally and just the common conductor brought out, this leaves two ends, one for the start winding one for the run, 3 conductors in all.
Al.

Thanks for explaining
Hub

[nick mulder]

finally got around to this.

I'm getting 25ohms on all three possible termination combos...

I expected the common like you said to show the same but the other terminations (where the cap would go) I expected double the resistance.

What aren't I understanding ?

[Al_The_Man]

?? The same resistance between any pair would indicate a 3ph motor?
Al.

[nick mulder]

I agree...

But there doesn't seem anything that special (1ph to 3ph) in the burned out control box - unless it can be done in some inefficient relatively partless manner ?

I'll investigate more...

Damn, I was hoping this was easy !

I do have a Seimens VFD here - (micromaster 420 at 3kw)


hmmmm

[Al_The_Man]

As you got it used, is it possible the motor had a controller on it at some time?
I assume it would be a 220vac motor, seeing where your located?
Might be worth a shot trying the VFD?
Al.

[nick mulder]

well, yeh

I mean, what could go wrong ?

I've already started one fire on this machine -

so... just wire it up UVW ...

I've barely used it so I'm a bit green on VFD specifics

Set the current trip limits low ?

What to watch out for ?

Even if I didn't change a thing in the drive worst case it should protect itself huh ?

[Al_The_Man]

The majority of VFD's have quite a bit of protection built in.
Often the default parameters are enough to do a primary test.
If it power up OK, use the manual keypad to run at a low freq/rpm at first.
When you come to enter the parameters it would be nice if the motor details were known, if runs, operate at a set frequency and measure the rpm if possible, this will at least tell you if it is a 2 pole or 4 pole motor.
Al.

[lens42]

Nick - I just found this thread and am very interested in how it turned out as I too have a V10P that I am rewiring. I'm changing the lathe motor to 3-phase with VFD, but would rather leave the mill head as is. It was unconnected when I got the machine, so I'd like to know:
1) Is the mill head supposed to be reversable?
2) Can the cap-run mill motor actually be run with with a VFD?

So Nick, how'd your machine turn out?

[Al_The_Man]

2) Can the cap-run mill motor actually be run with with a VFD?

A split phase (1ph cap start) motor cannot be run with a VFD, if the motor is 1ph cap run type, there are VFD's for them but they tend to be unpopular due to the habit of the motor dropping out of run on load at low rpm's etc.
Al.