[Arich0908]

Here is a pic of my toroidal transformer.
I never wire one up and there isnt much on the net on doing so . So in the spirit of not killing myself Im asking for help. I have a pretty decent multi meter if need be.

[Fastest1]

This looks to be the same.THUNDERDORK: DIY CNC Router - KL 7220 Power Supply - YouTube

[keebler303]

For 120V operation, connect red to red to 120V and black to black to AC Neutral. This is a parallel connection.

For 230V operation, connect one black to one red, and the other red to 230V (L1) and the other black to 230V (L2). This is a series connection

[Al_The_Man]

Here they actually mention the 2 reds to neutral, but it should not really matter.
Make sure you take an Earth Ground to the chassis.
Al.

[LeeWay]

The red and black are confusing on a DC power supply.
Typically the DC side are colored that way, however the AC side being red and black are correct for 220 voltage. It's more common to see black and white for 120 VAC.
Still rather simple to wire.

[Arich0908]

In the bottom right of my picture were the group of wires are going into the screw terminals. Right under that in the middle of the two sets of green screw terminal block there 4 pins I guess there called .
Do they have anything to do with wiring up the transformer? I thought 2 were inputs 2 were outputs .
You think Kelling would send you an easy how to .....
While im asking is it correct if I want more volts I remove winds from the secondary's but my amps will drop but if I want more amps I can use a thicker gauge wire?
BTW thanks for the help every one.
Edit why in that video fastest1 posted does he have 4 caps mine only has 2

[Al_The_Man]

If you want more voltage you add turns, removing turns reduces the voltage by approx 2t/v.
The other caps are dual outputs, depends on the amount of secondary windings.
Al.

[Fastest1]

That 5 terminal strip is the DC side. There are 2 sets of connections each having the same value.

Most likely the transformer in the video was bridgeable for more amps or volts probably depending on which way you wired it.

[keebler303]

Here they actually mention the 2 reds to neutral, but it should not really matter.
Make sure you take an Earth Ground to the chassis.
Al.

They also mention the 220V connection having a neutral, which is not true in North America.

[Arich0908]

That 5 terminal strip is the DC side. There are 2 sets of connections each having the same value.

Most likely the transformer in the video was bridgeable for more amps or volts probably depending on which way you wired it.

I know what 5 screw terminal connector is what im asking about is right above that you see 4 silver pins . 3 are going left to right and 1 is going up and down.

[Al_The_Man]

It seems what you are referring to is the bridge rectifier soldered side and mounted on the other side of the board, it has a screw in the centre securing it to the chassis.
Al.

[LeeWay]

Keling will send a sheet on these.
All you need to do is ask them.

[keebler303]

If you look at the datasheet Al posted they show a schematic of the power supply. You have a transformer, a bridge rectifier and a couple capacitors. They are all shown on the schematic as well as how they are connected.

Matt

[Arich0908]

If you look at the datasheet Al posted they show a schematic of the power supply. You have a transformer, a bridge rectifier and a couple capacitors. They are all shown on the schematic as well as how they are connected.

Matt

If I could read it I would of understood the one on kelling site and I wouldn't be asking for help here. Thats all gibberish to me .
Unregulated Linear 1000W/50VDC/20A Toroidal PSU (KL-5020) | Automation Technology Inc
So I have a bridge rectifier ... OK
From what Ive read its job is to convert AC to DC
Do I plug the AC power wire into 2 of the pins and pair the black wire together and the reds together take those and plug them into the other two pins on the rectifier ?

[Al_The_Man]

No! The unit is already wired, the AC input, 2 reds, 2 blacks have to be terminated to the incoming AC supply whatever you have.
In a machine application it is normal to feed these conductors from a suitable fuse, if 120v 1 phase then only the hot is fused, if using 240v then a fuse in each hot supply.
Al.

[LeeWay]

This is the most basic of wiring up a CNC machine.
Feel free to ask about other wiring setups.

[Arich0908]

This is the most basic of wiring up a CNC machine.
Feel free to ask about other wiring setups.

I pretty much know how to wiring the rest up this is my first toroidal transformer. The last two Ive had were the square power supplys with adjustable volt knob.
So what is the rectifier for then? It cant be there for looks.

[109jb]

The rectifier converts AC to DC. The capacitors smooth out the converted DC. You don't need to know that though. Just hook the 2 red wires together, then hook the 2 black wires together. Hook them to a cord that plugs into the wall. Those are the 120V AC input from your house. Then, add a ground from the third prong of the wall plug to the metal chassis of the power supply. Finally, the terminal strip is labeled + + c - - the + terminals are the DC+ and the - terminals are DC- for whatever you are hooking it to. The c terminal you don't use. You don't do anything with any other part of that power supply.

[Al_The_Man]

So what is the rectifier for then? It cant be there for looks.

If you want to gen up on the theory side, visit this site.
Rectifier circuits : Diodes And Rectifiers
http://www.allaboutcircuits.com/vol_1/index.html
Al.

[john-100]

Hi Arich0908


the rectifier is hidden under the PBC so it can make contact with the heatsink

John



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