Schaublin 125-CNC retrofit.

I didn't realise how simple and elegant it is to set up a state machine in a comp.

RotarySMP wrote:

I didn't realise how simple and elegant it is to set up a state machine in a comp.

Yes its pretty cool! I was surprised how easy it was to code. Without the state machine there would be lots of nested if/else spaghetti code!
The hard bit is often to decide what algorithm to use. If you get it wrong, it can be  a lot harder than it needs to be.
its an ideal demonstrateion what a component should look like. Short (68 lines) with a single, clearly defined problem being solved.
Why I've never used classic ladder.

 

that's a nifty little program, I'm curious to see how accurately it can control the variator.

I'd think the contactors would be kinda difficult to switch accurately for short durations.

Mark, put some flyback diodes in the contactor dc coil circuit, i was thinking this might be flyback voltage

smc.collins wrote:

that's a nifty little program, I'm curious to see how accurately it can control the variator.

Thanks, me too.
I just realized it needs an enable pin becasue from the original video, it is not allowed to move without the spindle turning. Something like:

smc.collins wrote:

Mark, put some flyback diodes in the contactor dc coil circuit, i was thinking this might be flyback voltage
 

Would flyback voltage still spike and cause issues if the contactors are manually activated (i.e. screwdriver)?  I'm genuinely curious.

spumco wrote:

smc.collins wrote:

Mark, put some flyback diodes in the contactor dc coil circuit, i was thinking this might be flyback voltage

 
Would flyback voltage still spike and cause issues if the contactors are manually activated (i.e. screwdriver)?  I'm genuinely curious.

So am i.

No eBay APP ID and/or Cert ID defined in Kunena configurationSomething like this should solve noise problems.

Would flyback voltage still spike and cause issues if the contactors are manually activated (i.e. screwdriver)?  I'm genuinely curious.

Given that there is no energy stored in the inductor (ie no collapsing magnetic field) I don't see where that voltage would come from.
 

Aciera wrote:

Given that there is no energy stored in the inductor (ie no collapsing magnetic field) I don't see where that voltage would come from.
 

Me either, but I don't know everything about magic smoke.  Like maybe there's some sort of induced field in the coil when the main contacts make/break - and I've never learned about this situation but it's obvious to everyone else.

Once the magic smoke discussion moves past my internal understanding of "electricity is like water through a hose, only not" I have to start asking questions.

a 20ohm fuel injector charged with 12v dc, can emit s much as 140v on shutoff depending on operating FZ and duty cycle.

a typical 24vdc contactor coil has a impedance of around 30-50 ohm. The flyback voltage could easily reach 140-200v on coil off especially if the contacts bounce as the field collapses. It's worth a look. ALOT of DC coils have built in diodes to prevent this, but maybe this unit does not.