Storebro260 
Project state 2012-04-12 / RH

After some success in getting control of the machine it decided to obstruct as Dave recently warned me about.
There are two problems and some other subjects below:

1) Main spindle motor static winding got no power. Reason is that the thyristor controlled high voltage rectifier doesn't run.
This is under investigation, it's fed with 380 V AC so you should keep your fingers under control but I didn't so two 16 A fuses erupted with a bang but nothing seriously seemed to happen, don't know if there is special fuses used, those two are marked "silica filled", I know there is special fast fuses for electronics but don't remember what they consist of or how they are marked.
The engine controls are manufactured by Siemens in the eighties.

Looking at the circuitry suggests there is a rather complicated path to trigger pulse generation, according to the block diagram:
http://abcnc.se/projects/storebro260/MainspindleBlockDiagram_red.jpg
and it's details, 3 drawings in one:
http://abcnc.se/projects/storebro260/Huvudspindel_Statordrivning_1-3.gif

What have been measured is that there is 380V AC in at 123-124 in BlockDiagram but no unfiltered DC out at 33-34.
That means there is a problem with the thyristor ignition unless the thyristors themselves are broken.
The pulse generation system are detailed on the above mentioned three drawings.
The main signal source is, I guess ”Usyn” on #3, an AC voltage derived from the coils of the 24V ± 15 V supply.
The following OP-amp chain is shaping the pulse but a second signal, "U Steuer" is connected to the last OP-amp and then fed to the dual pulse transformers over a darlington array ULN2003A with some suspect circuitry maybe a multivibrator/sawtooth-generator(?)

”U Steuer” generation is detailed in sheet #2 where we have some adjustments to phase and an adjustment called ”EMK soll” with unclear function.
Another input to this circuitry is input 107 Feldswäch-Aufschaltung who could be translated to something like "WeakFieldSwitch" entered to the circuitry over a relay V12
The third input to #2 is "UA ist" who is detailed in sheet #3 with a clear function and that is delivering a DC signal related to the rotor windings voltage.

And this is the state of affairs, any suggestions/info are welcome!

2)  Got more problem with the FANUC 6 Control who sometimes refuses to start or shuts itself down with no apparent reason.
Suspects a unstable line power supply maybe combined with some other problems related to aging….
No schematics or maintenance docs make problem worse…
Done some measuring on the power supply card who always are suspect…
One pin caused the system to shut down when measued, yes I did repeat that event!
LinuxCNC2 might be the long term saviour?

3) Installed Linux CNC2 on my VirtualBox emulator.
Runs nicely, what's next reasonable thing to do, I have done some playing around with G-code…

4)Managed to get access to AutoCAD 2007, now need some CAM SW…

5) No fifth subject unless I should repeat the annonuncement of the IGSViewer discovery… ;-)

/ Roger