Arrgggh

The notations are too faint for my eyeballs.
Being easily confused, I need the pic too help interpret.
The BO board has one lug per axis labled LS.
I'm looking at page 14 of the PDF for the Accu-Step BO board and trying to figure out how this needs to be wired.
Disconnect 24v+ from PC board 803 and ground it....??
Connect Red (X+) AND Grey (X-) to "X" LS on BO board....?

Ashby

All the limits switches wire to the P13 connector on the PCB 803 board. These are separate from the servo loop switches. Like I said you may have to replace +24v on the brown wire with common from the Accu-Step board.

I was looking your prints over. Very interesting.

Darek

OK, off to put a bunch ov wires in place.

You sure are patient with me.

Appreciate it......Ashby

First item on my todo list, get transistor.
Go to local electronics supply store.
Counter man has NTE book 2005.  N2074 not listed.
Couner man says "here you look thru the book, see what you need"
It's all greek to me.
Go to NTE website, enter ULN2074 in search function.
Result = Sorry, no parts were found for ULN2074
Google finds a chip, needs a socket.
From what I understand, I need a gimmick with three wires.  Base, Collector, and Emitter.
Base connects to Pixie enable, collector to OUT. SVO-ON (9), emitter to 24V COM (17)

Ashby

Yes the ULN2074 is a chip that contains 4-50V-1.5A darlington switches. You only need one.

A 2N7000 is a good mosfet substitute for a single section.

Darek

The good news is that all the magic smoke is still in place.

Got all 3 plus limit switches wired.  Installed the Darlington Switch.  Haven't put
the wires for the minus switches in place yet.  I don't understand how, with
only one spot on the BO board for limit switch input, is Mach going to process
info from plus and minus switches from one input.

I have 3 power supplies, one for BO board, one for Pixies, and one for spindle
control board.

When I turn on the juice to the power supplies the drives come up, and the PLC
comes up.  The VFD for the spindle doesn't light up.  Y and Z drives disconnected, so playing with X.  As soon as the X
drive is enabled the servo motor starts drifting.  This kicks the Pixies into
defaut.  I did plug the Y drive in to see if it behaved the same, it did.
Can't tune the Pixies in default, they need to be communicating with the
motors.  Same story with PC/Mach on or off.

Maybe I missed something in Mach settings   Don't think so, since I get the
same problem when the PC isn't on.

I have called Servo Dynamics to see if they will send me an alignment
procedure for the drives.

Ashby

At this point I would disconnect the command signal from the Pixie. Turn it back on while measuring the command output of the Pixie. The servo should drift like before, depending on the amp balance adjustment, and the output from the Pixie should climb until it faults. If this is what you see I would suspect you need to change the polarity of the command signal. You are probably sending it to ground now.

What should happen when you enable the drives, wether the computer is on or off, is the servos should lock in place. They should also fight any deflection in posistion at this point. Now they are ready to recieve S&D signals for movement.

Oh yea that is a special matched motor and drive for the spindle. The PDF states some of the motors have dual windings for high and low speed. The equivilent of an electronic gear change.

Darek

change the polarity of the command signal. You are probably sending it to ground now.

How to do that?

Ashby

EDIT:  Figured that out.  Swapped ref+ and ref-
         That did it.
         Now when I power up, X runs away
         Switched A and B encoder inputs on the BO board, still runs away.

Talked to Ed @ cncbuildingblocks.  Aparently I have the power to the Pixies wired wrong.

Sort that out & see how it goes.

Ashby

Got the power supply wiring redone.

Now the X axis that is powerd drifts. kicks the Pixies out. 

Changed the polarity as Darek suggested...........still drifts.

I'll put together a wiring diagram of my spagetti bowl and post it in a day or two.

Ashby