New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Desertboy]

My Hermes claimed they tried to deliver it today although I was there with the roller shutter door open so they are lying bastards, have to wait till Monday, would have been quicker to order from China lol.

Using the 50v transformer as a pattern (the 45v will be identical) so started to think about kitting out the box, anyone see any issues having the transformer under the stepper driver? I am going to fit 2 pc fans one sucking in and 1 extracting.



Going to use new capacitors as I have them and am going to need to fit everything a bit tighter.

You can just see the breakout board in the corner on a bit of ply will fit it roughly there and chop a hole with a cutting disc for the parallel port and USB to stick through.

Not sure I will fit the other BOB as I really don't need extra the input pins, good to have a spare though.

What's everyone set there AM882's microstepping up at?

[Desertboy]

Transformer came finally! didn't get round to soldering it but will have it up and running tomorrow ;)


Damn just realised I wired this up wrong lol but turned it on yet. The orange and black should be joined as well as the red &yellow.

Was tired this evening only just come home from work glad i decided to leave it till morning.

[Desertboy]

Almost there, got some connectors on a din rail for sorting out the wiring to the BOB, still need to solder the capacitors but will get that done tonight. Looking for my holesaw set at moment so I can make the fan holes in the enclosure.



The non working AM882 isn't bolted down just there for reference.

I have got a current inrush thermistor which hopefully is the right one if it cause problems I'll ditch it but it was £2 so I thought worth a punt. Hopefully with one fitted I can then use a type B mcb which I can just fit in the box ;)

I now feel it's starting to look like cnc electronics ;)

[Desertboy]

Got the capacitors soldered on a 2nd time, ready to test output voltage, need to get my mate tonight and borrow his hole saw so I can fit the fans and he's helping mount the box and the wires can be connected ;)



Now I need the new AM882 was quoted 10 working days delivery tomorrow is the 10th day :(

Ordered
one of these
http://www.ebay.co.uk/itm/230689466731

So I can fit it inside the box and take the mains in from the same feed as the transformer. Then I can wire first to a junction then on to the pc fans and BOB. This way if the toroidal transformer is one then the fans are running and less leads coming into the box.

I hope 1amp is enough, PC fan's are ~0.2amp I guess it doesn't need much to generate the control signal for the vfd.

[Desertboy]

Can I wire the stall detection output from 1 AM882 to the next then the last AM882 in the chain to the BOB?

[Neale]

Short answer - no!

Longer answer - the AM882 use an open-collector output. Think of it as being a normally-open switch that closes when there is a fault (like a stall). What you can do is wire them all in parallel and then to the BOB input. I do this with the EM806 on my machine and it works fine.

[Desertboy]

A little bit closer, ready to mount the box and start running the motor's and home switches. Need to mount the VFD as well so I can run the wiring 12v adapter won't be here till Monday.

Need holesaw for the fans mate has my cheapo set so going to see him tonight little bastard keeps forgetting it.

[m_c]

Short answer - no!

Longer answer - the AM882 use an open-collector output. Think of it as being a normally-open switch that closes when there is a fault (like a stall). What you can do is wire them all in parallel and then to the BOB input. I do this with the EM806 on my machine and it works fine.

I'm not sure about the AM882s, but with the software you can configure the EM806 so the fault output is active when ok (i.e. switched on), and goes inactive on fault (i.e. open circuit). That's how I configured my EM drives, which would allow you to loop through all the fault outputs and create a failsafe circuit.

[phill05]

Short answer - no!

I do this with the EM806 on my machine and it works fine.

Sorry to jump in on this thread Neale would the wires from the EM806's go to the E stop on the BOB?