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

[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.

[Desertboy]

Does this look correct it's the pulse and dir +'s connected to BOB pc 5v

[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.

[Neale]

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.

You are probably right about the AM882 also being software-configurable, but it looks as if getting a cable to be able to reprogramme the 882 and making all the configuration software work is another can of worms (judging by the experience of other people). I know it shouldn't be, but I didn't need to use the fine-tune facilities available through software and could manage with just the DIP switch options, so I chose not to change the factory setting for the alarm. That way I avoided any need to play with the configuration software. My thinking in this case was that normally you would be a bit more paranoid about NC connections, but here all the connections are hard-wired inside the box and so rather more reliable than anything going via plugs and sockets and around the machine itself.

Your recommendation is the better one; I chose to use a very slightly inferior option, and one that would be easier for the OP to use. Connecting in the fault outputs at all is a big leap forwards!

[Desertboy]

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.

I never understood what you wrote the first time but rereading it now it makes a lot sense basically setting the fault output to Normally Open. Basically doing the same as with microswitches setting them NC so if there's a dodgy connection line it will fault.

This is from the AM882 manual not got mine connected yet did make a cable but lost it lol but have more donor cables and usb to rs232 for the job.


I wonder if the AM882 software works with Wine if it does I could use the linuxcnc to talk to the drivers which would be convenient but it's nto a major hassle to drag a windows laptop to the drivers for tuning.

Alarm signal high/low will be it and also interesting I can inverse the AM882 direction in software although I can imagine annoying later down the line when you forgot what you did and are reusing the drivers lol.

I'm running the stall to the Estop so will need to swap the wiring round on the emergency stop button to NC to match and invert the Estop pin but no biggie.