3020T with 120v control box

[3020Newbee]

I just resived my first cnc, a 4 axis 3020. This is the one I bought;
4 AXIS USB CNC ROUTER ENGRAVER ENGRAVING CUTTER 3020T 3D DRILLING T-SCREW | eBay

Looks nice but there is a big problem. They sent me a 120v control box. When I plugged it in I immediately blew the fuse since we have 220v in our outlets here in Sweden. To buy a 200-120v transformer is expenseiv since I probably need one that can handle 500-600watt.
What shall I do?

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[Al_The_Man]

The add quotes: "Operating Voltage:AC110V or AC220V 50/60Hz(we also stock USA.UK.EU.AU.plugs and 110V-240V power version for the country all over the world.)"
Try asking them if is re-configurable, if not what can they do to remedy it>
Al.

[3020Newbee]

I asked the seller what to do but no response jet. The picture clearly shows a 220v version. I also locked inside if I could find any 120/220 switch but I didn't see one.

[john-100]

your control box looks the same as one in another thread here on CNCZONE that had a faulty speed control

the controller had a transformer that had two secondary windings

one to provide power for the stepper drivers and the second for the spendle motor

I would expect the transformer has two 110V primary windings that can be wired in parallel for 110V supplies and series for 220V
its more cost effective to have a universal 110V / 220V transformer even though it costs more to add the two extra connections to the primary


if your lucky you just need re-wire the primary windings and replace the fuse
its very important the windings are wired in the correct phase to each other the details should be on the transformer

very often they are marked 0V and 110V , for 220V you connect them in series with the 110V of one winding to the 0V on the other
the 220V mains to the free ends

................... coil 1................................coil2
L---------(120V++++0V)--------joint-------(20V++++0V)-------N


connecting a 110V machine to 220V will of over stressed many of the semiconductors so the fuse may blow again if any are short circuit

photos showing the transformer wiring will be helpful to see exactly what you have


John


PS
I could not find it late last night but
this is the circuit for the psu & spindle speed control from an old thread on CNCzone

PDF psu_and_spindle_schematic for YOOCNC NT65-3X


the mains transformer has two secondary windings
a 36V AC output that when rectified give you about 50V DC to power the spindle

and the second 18V AC output when rectified gives you about 25V DC to power the stepper motor drivers

view inside a 3 axis control box (4 axis version has a single axis board added for the 4th axis )
not enough detail to of the primary wiring but expect inside the white sleeves they are jointed to longer wires


PCB detail to go with the PSU circuit diagram


PDF circuit of 3 axis stepper driver

[3020Newbee]

Thanks for this very good answer. It is true that there are two primary coils connected in parallel. Is it really so simple as to connect the coils in series? Is there any way to be sure before I turn the power on and fry everything?

[erik65]

You are crazy to fool around with your new purchase, you obviously didn't get what you bought, you contacted the seller who isn't responding (surprise, surprise, Ebay), you probably paid with Paypal, so I would put in a claim at Paypal demanding your money back because of a mismatch between bought machine and delivered machine. And then see what happens. Oh, and replace the fuse before the machine gets send back. And if you also used a creditcard attached to your Paypal account, then contact your cc company also, often better than do the Paypal claim route. Just do them both.

[john-100]

this is how the transformer should be connected for a 220V mains supply

you will need to double check the RED & BLACK wires that are connected together are from separate windings




using a multimeter

you should have a low resistance between the RED & BLACK wires from the same winding
but have an infinite resistance between the two windings


John

[wisconsinjimmy]

If you are having trouble getting the chinese to respond leave a negatve feed back they will contact you, I bought my 3040T from the CNCSHOP on Amazon.

[3020Newbee]

John-100 I took your advice and connected them in series. It worked! unfortually the 4th axis driver burned up but that was probably due to someting else.
The spindle and xyz works fine and do not overheat.
Thanks!

[john-100]

a good result

the single axis driver should not be too expensive to replace ,

John