Emco PC turn 55 upgrade..

Not Working

Spindle- to 7 GND
Spindle Out to 8 Analog Input
Spindle+ to +5VP on 7I76
NC
Spindle Ena- NC
Spindle Ena+ to 28 Controller inhibit 1=enable
Spindle Dir- to E4 CW0/CCW1
Spindle Dir+ NC

So the spindle won't do anything when I try to jog it in the pncconfig. It is also outputting 3.5V at Spindle out and isn't changing when I hit the jog. Spindle Enable plus has 0V and doesn't change when I try to jog it. The pin on the VFD that is supposed to be 5.2V is 8.5 for some reason.

Those connections would not be expected to work

First, the ena and dir pins must always be used in +- pairs since they are isolated optorcoupler switch outputs
(that is that are not voltage outputs, they are the equivalent of relay contacts and can either be open
(no connection) or closed (connection between + and = pins)


The analog section expects to be powered by the 10V reference for the speed control potentiometer
if the drive does not supply this 10V, it must be externally supplied (12V is usually OK with scaling changes)

Do you have the spindle control manual or schematice or other documentation that shows the control pins?

The control pin table was attached above.

I figured out that the 5.2V reference is actually 5.2 above the reference ground of 3.5V, so if I used them as a pair I could get 5.2V. (comes back from lathe)When I hooked up the 24V input to the VFD the ground went to zero and that issue may have gone away.

I can move a dip switch to change it from 0-10 to 0-5, which seems to be the most convenient solution.

So the new pinout?
Spindle- to 7 GND
Spindle Out to 8 Analog Input
Spindle+ to +5VP on 7I76 or 5.2V on VFD
NC
Spindle Ena- to 28 Controller inhibit 1=enable
Spindle Ena+ to 24V
Spindle Dir- to E4 CW0/CCW1
Spindle Dir+ 24V

If 5.2V is available on the VFD, I would use it (and spindle GND) instead of the 7I76s 5V and GND.
VFDs tend to be quite noisy so it best to maintain the 7I76s spindle control isolation if possible

The more difficult issue looks to be the tool changer. I built the toolerator 3000, but after trying to match up wires it looks like that's not the answer, since my encoder has two less wires and runs on 5V and not 24. So now I need to figure out how to get the 7I76 to control it using the original turret controller. The three relevant wires are Sync, Strobe and Change.

My enable pin now goes high when I click enable amp in pncconfig. My spindle dir- is high all of the time, which is bad. I'm still not getting any movement out of the spindle or voltage out of the spindle out pin. I'm wondering if I needed to do something back in the I/03 page.