retrofit on EMCO PC turn 55

OK the first sounds like a standard one channel spindle plus index encoder so should connect to the 7I76s encoder input directly

The tool changer inputs may either need a level shift or perhaps a trick with the 7I76s analog inputs

I can easily convert them to 24v with a transistor and a resistor (resulting in inverted output), but I had imagined there would be some super-standard IC with a Vcc of 24v.

jrkeat wrote:

super-standard IC with a Vcc of 24v.

ULN2003 ?

Note that the spindle encoder needs to go the the 7I76 encoder inputs, so you really only have 2 inputs to convert

Since these are on the tool changer and are slow, I would be tempted to do a zero hardware patch
and connect them to inputs 0 and 1 on the 7I76 and read them as analog voltages, then put the analog
voltage through the compare component to get a bit (set threshold to 1/2 way up or 1.8V)

Eventually when we have 5V input options in the firmware this can be cleaned up

The Emco spindle encoder has an index pulse and phase A which is 100 pulses per rev. In my original wiring I used a 7409 open collector to level shift from the 5 volts to the G540 inputs which contain a +12 volt internal pullup. After looking at a datasheet it appears even +12 is exceeding the 7409 specifications of max output voltage.

When I added a second parallel port, I connected the spindle outputs and tool turret outputs directly to the second parallel port without a BOB because they are 5 volt signals and have the internal signal conditioning circuitry.

Chuck


I have an EMCO PC turn 50 which is pretty much the same as the turn 55 i think, except maybe the spindle motor on yours may be three phase, is that correct? Mine is all single phase 110V


any way I am still running the fan0t control and have always had trouble with the tool turret, when I program a tool change it will try to change and then error out, all it says is fatal error?


any idea what that may be caused by, I would like to sell this lathe but I may have too much money tied up in it to sell with out it working correctly.


if you have any pointers about the turret please let me know,


Thanks


Bob