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

[njhussey]

It's down to 236V today, powered it up and geting a nice 71V at the drives. The drives drain it down to next to nothing in about 20 seconds (not timed but it's a short time) 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.

Now on to the various safety circuits....time for some head spinning!!

[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...

[JAZZCNC]

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 shoch yourself...

Ok understand that side but still same applies has when you E-stop the machine will run on.!

[njhussey]

I'm having the Estops (and AM882 alarms) go through a relay (and Pilz??) which will kill the power, the limits I was going to wire through a relay and to the enable of the drives.....

[routercnc]

Hi Neil,

Looking through your build log on post #555 showing the control box -

Looks like the positive red DC output cable from the capacitors is going into an MCB. Is this correct and is this how you are intending to add a fuse? I'm a bit confused as I'd expect the MCB to be on the mains AC input side, and instead to see blade fuses on the DC output. Can you elaborate as I'm about to start my linear PSU build.

Thanks

[njhussey]

Hi Neil,

Looking through your build log on post #555 showing the control box -

Looks like the positive red DC output cable from the capacitors is going into an MCB. Is this correct and is this how you are intending to add a fuse? I'm a bit confused as I'd expect the MCB to be on the mains AC input side, and instead to see blade fuses on the DC output. Can you elaborate as I'm about to start my linear PSU build.

Thanks

I'm looking to get some of these but had forgotten about the MCB's. I was going to use them but I'm not sure they're the right thing at all! Lookig at something like these http://uk.rs-online.com/web/p/fused-...inals/8239552/ although I do quite like the idea of the 12V fuse holder EddyCurrent uses but not sure for a work environment?