Centroid Community CNC Support Forum

Hello, I’ve been doing a lot of reading on this machine ( new to me ) I made sure it was working correctly before taking apart. I couldn’t figure out the Heindenhain Tnc 2500 controller except enough to be able to put all parameters in and get up and running ( in English ) so last night I tore electrical cabinet off, which was EXTREMELY heavy and weed out items associated with old controller. Servos come off today.

I have ordered the Allin1DC unit plenty of motor and encoder cable , connectors , cncpc, remote pendant ,and such.

Currently looking at which VFD to get, looking at the DURApulse GS10, GS13N-27P5. What are some recommendations on this, or should I look at any others ?

I’m looking at using 220v single phase input , 2HP motor, id like to do rigid taping , I don’t think I can utilize spindle speed as I have a air assisted variable speed controlled by momentary switch on face of head.

Hopefully I’ve left plenty of information , I’m sure i missed something’s

Little background about myself. I’m 57 years old , over 35 years in the automotive business doing a lot of 12v wiring and such. Not nervous around wires
Or switches, relay. Etc. but new to CNC, I do own a 4’x8’ cnc router and plasma table that I can program and run very well , little rough using Fusion 360 but it’s coming to me, so I like the way that Centroids control looks. Not as overwhelming as the Heindenhain, or the Haas VF0 I have as well.

Any tips I’m hear to listen, thank you for any recommendations.
Attached is a pic of the Bridgeport set up BEFORE deep cleaning, and one of electrical panel and control board.

great machine!
cant go wrong with the dura pulse units , they are great vfd's!
rigid tapping doesn't care about the vari head, but it does care about an encoder connected directly to the spindle so it can 'see' what the spindle is doing!

order a resistive touch screen.
https://amzn.to/3AoIQHE

what CNCPC are you planning on using?

Thank you cnckeith. I have ordered the “mini” cncpc. I believe the only thing I haven’t ordered yet are the encoders. And looking into how to put an encoder on the spindle ? An information on this ?

I have a question about the encoder for the spindle. Does it need to be the same parameters as the ones for the axis except for shaft size and such ?

No, it doesn't have to be the same. Spindles typically use a 1000 or 1024 line encoder. Faster spindle speeds require checking the encoder mechanical speed limits as well as the electrical bandwidth limits.

Thank you tblough, I’m only looking for rigid taping. And I think that’s it.

I have a question about the servo motor transformer. How many amps can a transformer put out ? Do all 3 servo motors get power from 1 ? My transformer says 3kva, that should be like 12 amps 220v 1ph. My servos say 8.6a that should be to much for transformer under max draw so I’m a little confused. Attached are pics of 3 different transformer my machine has. 1 is the 220 to 110. Others are multi tap 220v to 20v to 360v

And one more question . Do I need centroid Intercon mill so I can design away from machine ?

Yes, all three motors powered by the Allin1DC rely on the same DC bus supply, and therefore on the same transformer and rectifier.

One Amp on the output of the DC rectifier connected to the transformer secondary, is not the same as one Amp on the 240V primary.

A 3kVA transformer should be more than enough to run three DC servos on an Allin1DC. Centroid factory installations typically used between 1.6 and 2.4 kVA.

I cannot make out what is going on in your transformer pictures, and cannot read the terminal labels behind the two wires that appear to be connected. I am guessing those say "0" and "200", which would be odd for wires that someone has stuck "110V" labels on.

It looks like the 3kVA transformer might be an auto-transformer, since there are no clearly visible separate primary and secondary taps.

Were you planning to use an old rectifier assembly from the Heidenhain control, or were you planning to use one of the three different Centroid rectifier assemblies?

I was planning on using one of my transformers and the DC Servo Power Supply Bridge Rectifier from centroid.

Centroid offers three different rectifier boards.

One ("CAPBRDLO") is for two-wire single-phase AC input. It is commonly used when directly rectifying 120VAC (yielding ca. 160VDC), or when rectifying 70VAC - 100VAC from a single-phase transformer to get a bus voltage between 100VDC and 140VDC.

Another ("CAPBRDHI") is for three-wire (center-tapped) single-phase AC input. It is used with a single-phase transformer secondary that is split around a center tap, such as Centroid's "high power" transformer (ca. 180VAC, split 90VAC to either side of the center tap), and also such as some Bridgeport transformers like those found in DC-servo Torq-Cut machines and V2XT knee mills, among others.

The third ("DIOCAP3P") is for three-wire three-phase AC input. It is typically used with 208VAC - 230VAC three phase, to make the ca. 340VDC bus voltage for Centroid AC servo drives such as the AC/DC, SD3, SD1, and SERVO4.

So, the rectifier you choose depends on the style of transformer you intend to use it with; and the two together, of course, depend on the target bus voltage, which is determined by your servo motor specs.