Deckel FP4 ATC Retrofit

01 May 2023 11:56 #270404 by Walkahz
Hi All 
A few years back a mate and Got possession of an old Deckel FP4 ATC with the TNC355 Control
It came from my workplace who purchased it from the original owner new back in 1990 (and who now worked for the company)
It never worked at my workplace as the batteries went flat and it lost all parameters.
After we aquired it i got some parameters from a german company and spent a few hours reloading them.
This all went to plan however the axis' would not move and go home.
After a bit of mucking around we kind of lost interest and as the machine is an hour or so away from me it is hard to spend time to diagnose and  so it has sat in my mates factory for the last 7 or so years. 
Now my friend is moving his workshop and has no interest in retaining the deckel. Providing i can move it it will be coming to my shed and i will attempt a control refit.

I would like to retain the original servos and drives for simplicity, i do believe the drives were our original issue a few years back.
I understand that i will need to source some EXE boxes if i go down this path.
What is the best way to test if the drives are viable? i have read about applying a small voltage to them to see if the servo moves.

Alternatively would a new drive similar to be an option? Only issue i see is that the max voltage is lower than the rated voltage on the servo. Is that a big issue?

Another issue i will have to overcome is the machine is 3 phase 415v  however i only have 240v single phase available at home.
With a control refit i will sort out some of the voltage and phase issues however if a VFD is used to power the spindle will there be any other requirement for 3ph power?

The tool changer will be a future challenge i really just want to get the machine making some chips first.
My previous CNC conversion experience is a round column mill conversion using a USB breakout board running Mach3 
The issues and glitches I faced with this machine are what has led me down the Linux CNC Path.


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17 May 2023 11:58 #271532 by andypugh
Replied by andypugh on topic Deckel FP4 ATC Retrofit
I bought one of those on eBay a while ago, but then the vendor talked me out of it. I think he was right, it would have been a very right fit in my garage.

I suspect that the machdrives drive that you linked probably has more "smarts" than necessary for this retrofit. It seems to be aimed at converting to step-dir control and closes the position loop in the drive. Which is fine, but LinuxCNC offers plenty of other options.

Do you know what voltage the servos originally operated at? It is probably not 500+V DC from the rectified 414AC, so you can probably get a suitable drive voltage with a transformer swap.
(I think I see 176V on the motor plate in the photo, but I am not clear if that is the spindle or a servo)

One option for a DC servo drive is: (Which can handle two motors per drive)

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17 May 2023 17:32 #271549 by spumco
Replied by spumco on topic Deckel FP4 ATC Retrofit
Looks like that Siemens servo is a 176VDC, 7.6A thing.  No idea what feedback it uses (couldn't find a datasheet)

An additional drive option:

No affiliation, just a thought.

Any of the drives mentioned top out at around 160-165V, so there will be a slight top speed penalty compared to the OEM drives.

Try to find a datasheet/manual for the OEM drives and see how they are controlled (-10v to +10v?).  That would be easiest to deal with rather than trying to match aftermarket drives.

Regarding voltage...
You need to buy a 240->400V transformer (common for European-sourced machines in the US), or plan on gutting all the electrical stuff (servos, spindle, control - everything).

Otherwise you'll wind up with some sort of Franken-monster with a 400V spindle (which needs a transformer) and 240V drives.

Quickest way to do this is 
  • 240->400 transformer
  • OEM drives
  • OEM spindle & drive
  • OEM coolant pump (if present)
  • Mesa analog-servo board 

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