[curtistdc]

Hello This is my first post and I thought this would be a good place to find some help for my questions. I just purchased a Lodge and Shipley powershift lathe that was converted to a slant bed lathe with an 0tc control by a company named scan-o-matic. This company is no longer from what I hear. I have got the control and lathe up and running but I have no spindle speed control through the fanuc control. Is it possible to run the spindle motor with a VFD controled by the 0tc control. Does anyone know if this can be done with the addition of a PLC or something to convert from the control output to the vfd input or something? I would appreciat any help on this topic.
Thanks
Scott

[tc429]

the 0-c can run +/- 10 volt analog to the spindle drive as a speed reference... on the cnc motherboard, look under the power supply(no need to remove it), about the center on the left edge of the supply...if theres a big empty socket there, you will need that chip- if the big gold axis LSI chip is in the socket, its just parameters/wiring from there...you will want to look thru the maintenance or parameter manuals, and the connection manual, pdfs are available online if you dont have them...

will your vfd take a =/- 10 reference? most will, and cnc hookup is pretty easy, you will need to set a few parameters for scaling and such. for safety, you might want to remove the drive belt till you get comfortable that you have stable control of the drive.

if you have a transmission, you will need to do some more work - the cnc needs to know what gear range you are in for scaling- this could present a issue requiring ladder work...as a workaround, you could scale everything for high gear, and just remember the lower gears will be way slow

see if the axis lsi is mounted, post a list of your parameters, someone should be able to give you some pointers on how to make it work.

[curtistdc]

Excellent that's the kind of information I like to hear I'm out of town right now I will look over what I have to work with also have some relays for spindle clockwise or counterclockwisethat are not being using the control right now. Thanks for the help. I have got a couple manual. But not all of them. Is there a place to find the manuals on line I haven't had much luck

[memoryman]

0-C manuals are available in PDF. I have them.
Why is there no speed control? If a AC motor is used, some kind of gearing or mechanical gear selection should exist.

[curtistdc]

Ok it looks like I have got the chip installed on the board. At least I think it is it. Its got gold trim and looks expensive. I have just ordered a connections and maintenance manual. I already have got the parameters manual and operators manual. When I get some time I am going to compare my parameters on the machine with the parameters book and see what I am going to need to tweak. The lathe does have a transmisson but it is a hydraulicly shifted one that I am not to sure of its longevity. I was hoping to be able to select a gear that will give me a usable range of speeds with the vfd anf motor combo I have now. Its 15hp 1740rpm 460 three phase continuous duty induction motor. The vfd I am looking at will range from 1 hz to 400hz. From what I understand I dont neccisarily want to run the rpm down too low due to heat problems. How about on the other end of things Does anyone have any idea how much you can overspeed these motors with a vfd? When I get some parameters sorted out I will post them to maybe get some help.
Thanks
Scott

[curtistdc1]

I know theis is a really old thread but I just finally got back to messing with this machine. I hope someone reads this and can give me a little help with the parameters for enabling analog spindle control of my 0tc control. I have changed some of the parameters I thought should be changed to enable spindle control correctly but I get no voltage from what I think are the correct pins on the M12 or M26 connector. Pin 10 on m12 or pin 7 on M26. here are a list of the parameters that are associated with spindle control.
0003 00010000
0013 00001101 tried 10001101
0024 10001000
0028 00000000
0031 00000100
0049 00000000 tried 00000001
0070 00000001 tried 00000001
0071 00000000
0074 00000000
0080 00000000
0108 00000100
0110 00000100
0249 00000000
0516 00001000
0303 00000000
0531 00000000
0532 00000000
0539 00000000
0540 00002000 This is for gear 1 I plan on only using one gear so I set it to 2000 for a max speed
0541 00001000
0542 00001500
0543 00002000
0564 00000000
0584 00001000

I think those are the only pertinent ones to this problem.
I tried calling up an m03 s1000 in mdi mode which should have given me a voltage at the pin of 5v but I got nothing. I appreciate if anyone has some insight here for me.
Thanks
Scott

[tc429]

is 900 bit 4 on? think it should be if the analog chip came installed.
does g120.6 come on with M03 (should be written in the ladder)
whats in diagnostic 172/173 - 12 bits calculated by cnc rpm number, all 1s = max
and diagnostic 124/125 - 12 bits output to the DAC chip, again all 1s = 10v... many ladders just move f172->g124, and the first four bits of f173 to g125

I think if 125.7 is on the ladder writing may not be needed? been a while, all ours use the moves as we just use single speed gearing too...


edit- nevermind: first, you need to put max rpm in parameter 556- right now its at zero

[curtistdc1]

Ok the 900 bit 4 was set 1.
I am a little confused as to g120.6 Is that diagnostic parameter 120 bit 6 if so nothing changes with a m03 command in mdi mode.
Diagnostic 172 and 173 never changes with changes in s inputs in mdi mode constantly zeros. I am assuming I should get 11111111 for 172 and 0001111 for 173 for a max speed 10 volt output command.
I am a little confused about the differences between say g125 and F173 are they different diagnostic parameter locations.
The 556 parameter was set to 2000 already for my max spindle speed for css operation. What does parameter 539 need to be set at? The manual says set to gear on for single gear operation.
I am not sure if I have the ability to do anything with the ladder on this machine. Do you know if there is any way to view the ladder on an 0tc.
This machine I am pretty sure was a one off so it is anyone's guess as to who did the ladder programing or if there was ever any documentation as to what was done.
I really appreciate anyone's and everyone's help with this machine. I believe it could be a useful tool if I could just get some bugs worked out.
Thanks
Scott

[tc429]

make sure you put g97 (might vary depending on what G-code system you have selected?) for RPM, not g96 surface feet per minute...anyways, the 172/3 should give 12 bits at max like you wrote- but only if the *sstp bit is on. might check that 917 bit 0 is off too, dunno if serial spindle would shut off the analog, or if the dedicated serial f/g bits might be added in the mix...dont have a book handy, but isnt 539 the 'offset'? +/- 4095 in 'offset' should force your analog output to +/-10 also... not sure, but may need to measure the analog relative pin 20, not ground/0v... I dont recall if the common is tied to 0 or not.

there is both a parameter(think its in 60, but its not in all the books) to hide the ladder, and also theres a Gbit that can hide the ladder if on- cant remember what its called, maybe like 'inhlad' or something in the signal list, can look up in the connection (function) manual...we had a fanuc robodrill with no ladder, and we didnt get a manual with it, read the chips and printed the ladder, here they made it so you had to select edit mode, key on, and feedrate 0% to activate ladder display for some reason, resets at next powerup...thought that was weird.

in first post, you asked about max hz too- of course 60 is safe, but beyond that... I personally wouldnt go past 80, but even that might be bad- watch your motor bearings, and transmission input bearing/lube system type stuff- unless it was built to run faster than 60 hz, you could overheat from too much oil, or worse...fast stuff generally takes less oil, or thinner greases like Kluber...regular old flooded bearings or grease packed bearings dont like high speeds... higher frequencies can beat up the windings if not designed for VFDs, but weve gotten away with it on a lot of old 60 hz motors without issue- even 60hz/lower can be rough on a non-inverter rated motor as the PWM stuff isnt a true sinusoidal or whatever line... make sure no motor power factor correction capacitors are on the machine too, power factor caps on inverters are a pretty sure way to pop things. just some personal opinions- your mileage may vary, so ask around

[curtistdc1]

So, I got it so I can see the ladder and see things changing when buttons on the operators panel are changed. The problem I have is I do not think there has been any allowance for analog spindle speed written into the ladder. I f I search for g172 or f124 there are no references to them in the ladder. as for g120.6 it is listed once but there is a not in front of it so I am not quite sure as to its purpose. From what I can tell I think I may be out of luck with analog spindle speed control due to the lack of allowance in the ladder. Short of getting the equipment and software to modify the ladder I think I am stuck.

[tc429]

there is a standard parameter for 'spindle control handled by CNC or PMC' or something like that- I think...if you set that you might be able to do it without the ladder stuff...i'll try to look when i get a chance

the *sstp is "not spindle stop" so its not unheard of to see it 'un-notted' if thats even a word