Driver wiring advice needed...

[Jonathan]

Here:



Make sure you set the step outputs in software to active low.

[Wal]

Cheers Jonathan.

Hmm, so nothing connects to the PUL-/DIR- pins on the driver...?

>Make sure you set the step outputs in software to active low.

How can you be sure that this is the case? Would this not be entirely specific to what pulses my parallel port is sending..?

Oh yeah - PM me your PayPal details for the spindle mounts, man!

Wal.

[Jonathan]

Cheers Jonathan.

Hmm, so nothing connects to the PUL-/DIR- pins on the driver...?

They go to ground.

>Make sure you set the step outputs in software to active low.

How can you be sure that this is the case? Would this not be entirely specific to what pulses my parallel port is sending..?

With this setup, when the parallel port output is low the output of the breakout board is 'open', so the driver pin will be pulled high. It's therefore inverted, hence the parallel port needs inverting to restore normality.

[ruffle]

This thread is handy.... a large package arrived today with some DQ860MAs and a DB25-1205 BOB

No documentation of course :) The BOB has jumpers and I've no idea what they do. I'll email the supplier and see if there's any info.

Wal - please update this thread as you go; I'll be one step behind you.

[ruffle]

Found this:

http://www.nbglin.com/download/cnc25...g63R68R-Yj4h1A

which 'documents' the BOB. It's in terrible chinglish (although better than my Mandarin!). Changing jumpers J1&J2 changes from single to double power supply.

One picture shows VCC, VSS, GND and VDD for the power connector and the other one POWER+5V, POWER-GND, DB25-GND and DB25-VDD for the same connector.

Huh? Now I'm confused. Does this make sense to anyone?

[Wal]

Make sure you set the step outputs in software to active low.

Any idea how to do this in LinuxCNC?

Wal.

[Wal]

Okay, so I connected an axis up using the control pins (2/3) to PUL+ / DIR+ respectively with the PUL- / DIR- going back to the GRND on the BOB.

Nowt.

Set the step outputs to 'active low' - thanks again Clive for pointing out how to do this: check the 'invert' box in the Parallel Port Setup window (Stepconf utility)

Still nothing.

After a fair amount of head-scratching I measured the voltages coming into the PUL+ / DIR+ terminals on the driver - I know that it's gonna fluctuate when the 'test axis' utility is running, but the voltage was peaking at about 2v, both at the driver and the BOB. A bit more head-scratching before connecting the control pins (2/3) on the BOB to the PUL- / DIR- and +5v to the PUL+ / DIR +. Output pins still set to 'active low' and hey presto...

Pics and (rather meaningless, yet somehow satisfactory) video of my motor rotating back and forth attached.





Another question - as shown in the diagram here, will it be okay to take the +5v from the PS into a 13amp terminal block and distribute the power to the BOB and the drivers from there? I can't see why it wouldn't, but there's the duncery kicking in again...

[JAZZCNC]

Another question - as shown in the diagram here, will it be okay to take the +5v from the PS into a 13amp terminal block and distribute the power to the BOB and the drivers from there? I can't see why it wouldn't, but there's the duncery kicking in again...

Yep that will be fine.!!

[Wal]

Hello again.

Sorry to resurrect an old topic - I've been working away from home for a while and am just catching up a bit with bits and pieces of the build. Since my last post, I've come across some instructions for the drivers I'm using, but they're in German - although I think it's probably fairly straightforward to decipher the diagrams if you know what you're looking at.

I've attached a couple of images - one is of the German instructions and the other of the LinuxCNC Stepper Mill config window - the bit I'm concerned with is the "Driver Timing Settings" section.



I'm led to believe that the German instructions pertain to the "Driver Timing Settings" and this is how the text translates:

Schrittimpuls = Step Pulse

Richtungssignal = Direction Signal

Freigabesignal = Enable Signal

My motors work with the default settings - indeed, they work with a load of different settings, but since this info comes from a German manual distributed by a vendor, it's probably more likely to be correct, rather than me mashing in a load of numbers...

So, based on the diagrams, am I correct in thinking that:

Step Time = 1000
Step Space = 2500
Direction Hold = 2500
Direction Setup = 1000

Any thoughts?

Wal.

[Clive S]

Wal I think you will find if you just use 5000 in each of the boxes it will be fine ...Clive