It's probably just me being exceptionally dense, but I cannot figure out how to 'drive' the Combivert on my Easiturn lathe to control the spindle. I've read the manual that has been uploaded to this site, but still cant figure it out. To complicate matters, the wiring schematic in the PNC3 manual is slightly different to the Combivert manual, which doesnt help ...and both are different to what is actually on my machine.
So far, I think that I have figured out that:
- +24v on the FWD port (pin 10) will make the spindle run forwards, or
+24v on the REV port (pin 11) will make it run in reverse.
The COM port (pin 18) is the 0v ground line for all the Combivert control lines
Then I run into trouble - the schematic says that the REF line is the speed output, and that the PP line is at +10v. The Combivert manual makes no mention of the PP connection (nor does it mention a +10v line) so I cant identify this port/pin or what it is for.
Also, I cant see how and where you provide a variable signal to control the speed - I assume that it would have to be 0-10v analogue, like most VFD's. Does this go to the REF line? I cant figure out why this would a speed *output* (since there is an encoder on the spindle).
Can anybody advise me here?
Regards and thanks,
Rick
