Comments sought on new build: A CNC Router for RC Gliders and Planes

[JAZZCNC]

I'll still at a later date put a 240V relay in and put a resistor across it to drain it quicker in case someone goes in the panel within that time.

Yes I would do this anyway neil because if your not isolating the drives enable signal then the motors will remain powered until caps drained and this will cause them to run on slightly before fully drained.

[njhussey]

The door isolator turns off all power so it's just for drainging the caps in case someone puts their hand on something.....although I've got hot glue over the soldered terminals on the caps so you shouldn't be able to shock yourself...

[njhussey]

Ok so back on this again after doing work for the last week or two....

Got my estop circuit working using this modified drawing...



I've got to put the AM882s alarm signals daisy chained in the estop circuit but I think I know how to do that using another relay with 2 x NC connections.

Next problem is I keep blowing the 6A C type MCB when switching on....I'm guessing that I need a soft start to stop the inrush into the caps....can someone help with this? I'm guessing a thermistor with a relay/timer?

[fvfdrums]

We get this as well but it's not consistent sometimes it'll pop once or twice other times straight away and that's with the caps fully discharged. At the moment I'm living with it but if there is a solution I'm all ears? D type breaker?

[njhussey]

D type breaker?

I thought about that but I think I'll go for a thermistor through a timed relay or whatever people recomend...

[JAZZCNC]

Don't mess about with thermistors and shit just put a D type MCB and you'll be sorted.

[njhussey]

Don't mess about with thermistors and shit just put a D type MCB and you'll be sorted.

Cheers Dean.....D type MCB ordered....

[routercnc]

Anything further to report Neil ? You were so close . . .

[njhussey]

I'm back on it next week, other projects took precidence and one of us (only 3 in the office) was off for 6 weeks which meant extra workload. We've so many projects that need doing that it's a case of doing one at a time, We outsourced the plastic bearings that I was building the router up for so the rush is off but ill be back on the wiring next week!!!

[njhussey]

OK so back on it today briefly (before having to go on the Lathe all afternoon re-necking pins for a customer order...) and ordered some more bits from Chalon so I can re-do the fuses from the transformer to the drives. otherwise I've just cleared the decks a bit whee other crap had been put on top of the control cabinet.

Once the bits arrive (more ferrules etc) I'll be continuing the wiring with a vengeance and then re-looking at the safety circuits so I can get the machine up and moving ASAP expect lots of daft questions on control philosophy again......