This is up to @CNCtechs
Could you check what Ampere number was on the fuse?
For a nominal 13A I would put at list a 16A fuse otherwise I would expect overheating again in the future.
I had a quick check with Dario at the board and for machinery I would expect to see at list 32A breakers on ring circuits, with two 2.5mm cable branches.
Currently there are 2 x 16A, 2 x 6 A and and 1 x 4A.
I guess none of them is on a ring.
If anyome with a 18th edition would like to supervise and help, I could join to help on that, as once modified there will be a need for a new certification.
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ok, there appears to be a bit of confusion on this.
A 3-pin plug can legally take up to 13A, so please DO NOT INSTALL a 16A fuse (I don’t even think they make 16A fuses that fit in a plug).
32 amp can power up to 7600 W, and I strongly doubt we have a 7-something-kilowatt extractor!
The datasheet on the extractor mentions 3000W. That is with all the motors on, so a 3-pin plug correctly installed can suffice.
I am not sure what @lamacchiacosta means in regards of the need for a 32A ring in the board (what board are you referring to?)
I would please ask that NO modifications be made until a qualified electrician has a look.
I will be in on Saturday and I am happy to help.
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I guess in the discussion, spikes, transients, shorts have been ignored.
If the 13A mentioned on the machine label is nominal, the 3 plugs connector will always overheat and melt.
When the three motors are on, the nominal power is 3000W, which means it will drain about 12.5A.
If the circuit is connected on one of the 16A breakers on the board, we are always very close to protection (if we manage to switch them all on), but surely when switched on they will produce a spike higher than 16A so it will trip.
If connected to the 6A or 4A they will always trip.
That’s what @dario is experiencing.
A certified electrician is highty advisable to step in as currently the board is not compliant with current regulations and is definitely unsafe and usuitable to use with machinery.
As already mentioned, I can help if supervised, but I won’t touch anything until told by a certified person.
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Just an fyi this extractor never needs to have all 3 motors on, 1 motor suffices and we’re thinking of ways to prevent anyone from turning on more than 1 at a time
The motors have a cage where air filter bags that slip over and there were little black tabs in the bottom of the bags that keep the bag from collapsing into the cage (and ultimately into the motor intake). I removed one of the motors because it needs some attention regarding a seal and badly taped on cage (the others are glued on). These are simple fixes. Some of the cable glands were loose, tightened those up. The white PVC we’re not a big fan of, we push for H07 in the space where possible, easy to remedy.
The little black fan was wired wrong and got burnt out but that fan will do nothing anyway.
I couldn’t find any plug that needed replacing in the area (edit: oh, wired in, got in)
I’m thinking maybe an emergency stop button near the extraction unit is a good idea since there is 3000 W of motors sitting above a pile of dry wood dust, the CNC operator might not see anything if it catches fire but another person might and stop it instantly?
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as far as i am aware, any emergency stop in the woodshop area will cut power to that as well.
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Just tried this extraction stays on
Oh… really?
ok, I really need to have a look in person!
Please give me a shout if you or @dario (or ideally both) are around Saturday afternoon.
Yeah I’ll be in then, I’ll let you know if anything changes.
Discussed and video called with Christian, with ONE motor working the system seems stable, anymore motors and the breaker immediately flips.
We’d say it’s good to use tentatively, but it would be good to really dig into it Sat aft