According to George :
DoN. Nichols wrote:
[ ... ]
Hmm ... you are operating it from a "static phase converter"
such as those made by Phase-o-Matic? If the pre-op motor is a single
phase motor, it (and the various control relays) will be sensitive to
which two of the three phases they receive power from. They must be
powered from the two wires which go through to the 220V single phase
line, as those are the only two which are sure to have power.
I'm presuming that you had the converter stored separately, and
had to re-connect the lathe to the converter. What I would suggest is
that you disconnect the three phases from the converter (or from the
plug, if you have set it to plug into the converter, but that would
probably not have changed the wiring), connect each wire to the terminal
to which the next one was connected, and try again. If that doesn't
fix it, try the same change again once more.
[ ... ]
Does anyone know enough about this old Lathe to suggest what may be
wrong and does anyone have either a circuit diagram or handbook (or
both) that I could beg borrow or buy.
I must admit to never having even *heard* of this brand of
lathe, and I'm not quite sure what a "pre-optive" motor does. My guess
is that it may adjust the variable speed pulleys.
[ ... ]
In spite of not knowing my lathe you may have hit it on the head.
I don't know your lathe -- but I know things which can be in
common between quite a few lathes, and this appeared to be something
which could appply here.
I
did change the wiring from the 3 phase converter. I used it for a
pillar drill and the phase rotation was wrong so after checking that it
was correct rotation for the lathe I did not check which one was the
"dead phase, It only come up to voltage when the motor load comes on
and although the pre-optive motor is 3 phase it is very small and not
enough load on the converter, I feel.
You might want to make a rotary converter, then. That would
have no problem running a smaller three-phase motor. Since your lathe
already has an excellent way to change speeds (from the part below),
there is little reason to use a VFD for this -- and the extra controls
in this lathe might well make a VFD more difficult to apply.
If you can scrounge up a larger three-phase motor to use as an
idler -- one at least 50% higher horsepower than the lathe's own motor,
you should have no problems using the preoptive motor as well. You can
even use the existing phase converter as a starter for the rotary phase
convertor's idler.
And -- the spindle motor can act as a rotary converter to run
the smaller one. If the speed control on the spindle is the typical
variable-speed pulley, those are not supposed to be adjusted except when
the main motor is running, so this should not be a problem, once you can
get the spindle motor spinning.
The preoptive motor allows on-the-move speed changes to be selected
prior to requiring the change - at which time you just press a button
and it changes , rather like using an epicyclic gearbox on a car.
Herbert is very well known in UK and there are a lot still about. Mine
is far too big and complicated for what I do with it, but it is better
to have a lot of facilities and not use them than not having enough and
always getting stuck.
That sounds like a particularly nice lathe -- and well worth
putting it back into service.
Thanks very much. I shall try your advice tomorrow, or Friday as I
shall be busy tommorrow morning. Regards George.
O.K. Best of luck,
DoN.
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