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.....
Last edited by njhussey; 08-04-2015 at 03:10 PM.
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.
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?
Ok, thanks. Then I'll stay with my original plan which is 6A MCB type D on AC side of PSU, and automotive blade fuses on the 70V DC side. I plan to fit a trial 1A fuse on the DC then jog an axis to deliberately blow the fuse. Then I can make sure that it blows cleanly and there is no residual arcing from the 70V. I'll then fit the intended rating. I think Eddy and Irving both went this way.
But the DIN mounted fuse probably is the way to go for how your machine will be used industrially. Do you know if the 5x20mm fuses need to be specific for DC? This was where I got stuck with this option because reading around AC and DC currents seem to require a different type of fuse and so I went back to the automotive type which are definitely for DC. I wondered if that was why the fuse wire was such a curly shape on the DC blade fuse instead of the straight wires in the AC ones, to make sure there was a clean burn/break rather than continual heating, expansion, and arcing.
I'm not coming from a strong electronic knowledge-base so the above are just my views / thoughts.
As for the rest of your build looking very professional now, well done.
I would trust the 5x20mm fuse more than the blade fuses - running a 240V AC fuse at 70V DC seems more reasonable than using a 12V DC fuse at 70V DC.
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?
Last edited by njhussey; 23-04-2015 at 10:07 AM.
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?
Don't mess about with thermistors and shit just put a D type MCB and you'll be sorted.
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