ALLin1DC install on Knee Mill HELP ME!

[grbracing]

Hi All,

I am trying to install a Centroid Allin1dc system on a Supermax YCM-40 that use to have an older centroid system, which i believe was the M40-N3.
The Machine has servo motors fro X,Y, and Z Axis, and has the M400 Control Console.

Jeremy in the Centroid Support department has provided me with both the schematic for the M40-N3 and and the a schematic for the new allin1dc system. SO my hope is to follow the two schematics along with the allin1dc installation manual to re-wire the old system to the Allin1dc. I have a decent understanding of what needs to happen and feel comfortable trying to accomplish this but by no means am I an electrical engineer. So I appreciate any help I can get.

Off the bat, the machine came from a high school shop where it was wired for 220v 3 phase power. The building (shop) I have the machine at now has 440v (480) 3 phase power. So I have re-wired the motor on top of the spindle for 440. And I have re-wired the black transformer in the middle bottom of my electrical cabinet, which i believe is for the "110VAC Step down transformer" for the higher 440v 3 phase power according to the diagram on the front it. My big issue right now is there is another larger transformer to the left that has no markings or diagrams that I do not know how to re-wire for the higher 440v power. I believe this transformer is for the "Drive power supply." I have attached some pictures of the wires going into this transformer so anyone can help me figure out how to rewire it for the higher amperage it would be greatly appreciated.

[tblough]

Post the schematics and we'll try to help you through them. My "guess" is the small transformer is for the control, the large transformer is for the DC bus. You'll also need to swap out all the motor starters and overloads because they'll have the wrong coil voltages.

It would probably be easier to just add a step-down transformer on the incoming power.

[grbracing]

Tom, the schematics are uploaded they are the two files between the pictures, the m40-n3 file is the schematic of the old system currently in the electrical cabinet. And the s14610 file is the schematic for installing the allin1dc. Let me know if you cannot access the schematics....

Adding a step down transformer on the in coming power sounds like a great idea, especially if it would prevent having to switch out multiple items. Can you elaborate on how I determine what transformer to use to do this etc?
Thanks!

[tblough]

Sorry - didn't notice that. From the M40-N3 schematic, the small transformer is the 110VAC step down transformer for the control. The large transformer is Drive Power Supply.

Unfortunately, the drive power supply cannot be re-tapped for 440V input. It is tapped for 230/240 inputs only. Since you'd need to replace this transformer anyway, it now makes more sense to add a step-down transformer for the complete mill instead. In order to size a step-down transformer for the whole machine, we need to know what the nameplate AMP rating is. If there is no nameplate rating on the machine, we can estimate it by adding up all the motor loads. The servo drive transformer I believe is 2400VA, so if we take that and add it to the spindle motor nameplate FLA * nameplate voltage (which gives us the spindle VA) and then add in another 800-1000VA for all the other loads, that will give you a fairly good estimate of the transformer you need for the whole machine. Lets say it has a 5-HP spindle motor. Those are usually around 16A @ 240V 3Ø, so that's 3840VA + 2400VA + 800VA = 7040VA

Here's an 8.5KVA 3-phase 480 to 240V transformer on eBay for $265 - https://www.ebay.com/itm/8-1-2-KVA-8-5- ... SwB09YLHue

And a brand new 8KVA for $900 - https://www.ebay.com/itm/NEW-Shin-8kva- ... SwzatbLT4W

[cncsnw]

The servo power transformer should work just fine on 440/480 power. Just connect the two lines to the outermost taps, and install a jumper joining the two middle taps. This will be essentially the same as what you did with the 110V transformer.

[cncsnw]

If you do reconfigure the cabinet from 200V to 400V:

Any fuse that was in the 240V supply lines will need to be replaced with one that has approximately half the amp rating of the original fuses.

You will need to verify that any line-side wiring is done with wire rated for 600V, not just for 300V. This is probably only an issue with outgoing motor power cords, where the installer may have used SJO... cord ("junior", 300V) vs. SO... cord (standard, 600V).

[cncsnw]

The large transformer should have markings by the taps. Try wiping the bottom side clean and looking at it with a mirror and flashlight, to see if they are marked "0V", "230V" and "240V".

[grbracing]

Update: Thanks for the help everyone, In talking to my uncle, who has allowed me to put the mill in the corner of his shop, he has a step down transformer that I can use! Its an acme power T-79846-3S which I believe has a 75KVA rating which should be more than enough according to tblough's math. Anyway, I think its best to use the external step down transformer and keep the mill wired at "240v" three phase. I have posted a picture of the transformer and its tag, for verification.

[grbracing]

Here is my next question, I have the M400 console on a boom arm off of the machine. I was trying to "bench test" the ALLin1DC and make sure the software is installed and such. I hooked up a 110v power line to the logic power of the Allin1DC and that turns on and works as it should in the installation manual. I also hooked a 110v power cable the computer (M400), The fans turn on, the light on the board turns on but the screen does not. Anyone have this issue or is there a on'off switch i'm missing? pictures of the back side are below.

[cncsnw]

The display controller board (the one in lower center that receives the blue VGA cable, and has fine ribbon cables going to the LCD display panel) needs to have 12VDC plugged into its lower left corner to operate.

Somewhere in that rats nest you should have a plug adapter that gets 12VDC from one of the plugs coming out of the power supply, and goes to the cylindrical power connector for the LCD controller board.