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Emco Turn 120P
« on: February 10, 2008, 03:21:48 PM »
Just got myself an old emco turn 120P  ;D
when I picked it up I got a shock :o in that it has a large DC spindle, which I did not expect
This motor is a siemens 1GL5104-0EZ40-6JU7-Z  and the drive is the emco one, which seems 3 phase fed.
I would love to keep the motor, so am trying to get info on it, none seems available on the net

Has anyone converted a 120P to mach and retained the steppers and drivers, seem Ok so why waste them?

any info would be welcome
especially schematics as I would happily pay for those....

« Last Edit: February 10, 2008, 03:37:05 PM by Graham Waterworth »

Offline Chip

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Re: Emco Turn 120P
« Reply #1 on: February 10, 2008, 06:35:26 PM »
Hi, JB

I think, Most of these machines are 380 volt 3 phase, Did you get a transformer with it, 220/440 to 380 ?

You may be able to drive the spindle with a VFD 220 1 ph to 220 3 ph control.

As far as the steppers go, Ether make a interface board for the driver boards or use Gecko's or other's types out there.

Post some pictures of the stepper cont. boards, spindle control and basic layout.

I looked on cnc-zone didn't find much, http://www.cnczone.com/forums/showthread.php?t=14548&highlight=emco+120p .

Just a Start, Chip
Re: Emco Turn 120P
« Reply #2 on: February 11, 2008, 03:01:40 AM »
Thanks Chip

The machine was wired for 3 phases (UK), The control, stepper system is ran from single phase ( L1 + N ), the spindle drive / oil pump are 3 phase
this would have been connected directly to the main network.

by the looks of things (phase anshnit steuerung) the spindle drive is a thyristor drive which means it needs the 3 phases for the timings (3 controlled rectifiers 1 for each phase)
so either I have to re-create 3 individual phases (much like an AC drive) or somehow send timing signals to a single pair of rectifiers....
I looked at single phase DC drives and they seem quite costly...still some investigation needed.

The plan is to disconnect the drive for now and fire up the system, see what works and what I can raided for Mach control
diagrams would have made it all so much easier...but then I got this at a good price

it is surprising how little info there is on these machines

pics of the control unit, note the 3 pole ABB breaker left of the spindle drive, also note the 3 black wires and blue neutral wire going into the top of the drive
Re: Emco Turn 120P
« Reply #3 on: March 03, 2008, 03:32:38 PM »
just seen your post.
if you still need help let me know, I'm very familiar with these machines.
Re: Emco Turn 120P
« Reply #4 on: March 03, 2008, 05:04:02 PM »
we can all always use help :-)

I have been lucky in that the UK importer send me the diagrams which makes life a lot easier

So far I have removed the DC spindle drive as there was no sensible solution to running it from single phase
The money spend on making 3 phase/changing the DC drive would easily pay for an AC spindle with closed loop control

Stepper wise, well they seem to work (powered it up) Not seen any movement yet as I have remove the controller cards
(intend on sticking mach3 on this thing) if they behave I will keep them, what is odd is that according to the docs, they are set to full step and not halfstep
(bearing in mind these are 5 phase steppers) I would have though this runs at high resolution....

if work does not keep me away from it, I hope to run step/dir signals mid week....
currently I am mapping out the control signals between LPT and a cubloc

what seems odd is that the monitor only has a ribbon loom going to it (with composite signals) and no power ????
so that is why i did not bother firring up the full system.

Getting ahead of myself here I am looking to find tooling for this thing, as the toolholders seem Emco specific, do you know of a source ?

what is your experience with them , do you run them as per "factory setting" or have you converted ?

Re: Emco Turn 120P
« Reply #5 on: March 15, 2008, 08:45:21 PM »
I used to have one of these 5  years ago.  Was a good peice of kit!

Unfortunatley it died when I moved it and I didn't have the time or inclination to fix it.

I sold it to the guy who is going to help with my Hurco retrofit so it will live again one day......
Re: Emco Turn 120P
« Reply #6 on: March 16, 2008, 04:52:30 AM »
Hurco... got my Inventor training at their place (toolbox software) was rather distracting those monster machines

Thanks for responding, you may be able to tell me where I can find tool holders for the turret
I have two units for boring bars/drills and a busch
I have no OD tooling...which limits my options a bit ;).

I will have a set of controller cards free to be sold later on(say a month or two)... if that helps the other guy
still use them to work out the original wiring and circuits

also for sale is a full DC drive units (motor/electronics/main stage with chokes) ;D

Re: Emco Turn 120P
« Reply #7 on: March 16, 2008, 09:20:41 AM »
I just turned the bushed for the drills etc.

I got the turning tools for the outer slots from J&L. Just cut them to length and made packing peices where needed.

There should be a big grey transformer box with the machine as it runs on a different voltage.

I'll let my man know that you will have spares. From talking to an engineer who specialises in these the Axis cards are not very reliable.
Re: Emco Turn 120P
« Reply #8 on: March 17, 2008, 05:42:20 PM »
Thanks for the info, will have a search at J&Ls slow website

on the control side, I have managed to interface to the original stepper drivers,
the next step is to talk to the other bits like the tool turret control and some of the aux controls
non of this worries me to much (i work in electronics) altough I occasionally need to look in some very old books to understand what emco has designed
in the late 80ties (8088 micro, BDT64C transistor......Ooooold school)

I noticed that the machine favours high feed rates as low stepper speeds make a lots of noise.....
does that tally with your experience of them ?

grey controller box?? :o I have the machine on a stand, and a controller box on a stand
that is all as far as I can see.. if was a 3 phase machine

Ah yes the controller front panel is also surplus to requirement....

Re: Emco Turn 120P
« Reply #9 on: March 17, 2008, 07:10:46 PM »
To be honest I cant remeber how noisy it was but there was definatley a seperate grey bosxwith  big transformer in it!