SWI Trak 1745P - Allin1DC Retrofit

[centroid467]

Regarding the Capacitor/Rectifier Board for this installation:

Both sechematics I am working off of show 83vAC connections from the secondary of the transformer feeding the input of the capbrd. (I am assuming one high and one low?)

The original transformer from our cabinet looks like so:

What do I need to do to make this work?
Max Armature Voltage on these motors is 160v.

Thanks!

Hello Hans,

The second Google Photos link is broken.

Using an 83V secondary as shown on the schematic will give ~120 VDC from the output of the rectifier (CAPBRDLO).
110V secondary will give ~155 VDC.

The input to the CAPBRDLO is AC so it does not particularly matter which lead of the secondary goes to which of the input terminals.

I think the "LOW" on the schematic is referring to the particular variation of CAPBRD. We have CAPBRDLO and CAPBRDHI which are for different input voltage configurations.

[cncsnw]

If you use the "0" tap and the "109" tap you should be okay. That appears to be what the previous control did.

You will probably get closer to 115V out of the "109" tap, since you are probably putting 240V or more into the nominal 230V primary taps.

[KreiderMachine]

Sounds good, thanks!

[KreiderMachine]

Keith (or any who may know),
How did you go about identifying wire assignments when you spliced in the new cables for your X and Z handwheels on the trl1440 conversion. I have studied the build album but cannot quite identify the wires.

Where might I find this pinout, or how can I test these? I can identify v+ and gnd, but I'll need to confirm voltage input (24v?)

[KreiderMachine]

Regarding the Capacitor/Rectifier Board for this installation:

Both sechematics I am working off of show 83vAC connections from the secondary of the transformer feeding the input of the capbrd. (I am assuming one high and one low?)

The original transformer from our cabinet looks like so:

What do I need to do to make this work?
Max Armature Voltage on these motors is 160v.

Thanks!

Hello Hans,

The second Google Photos link is broken.

Using an 83V secondary as shown on the schematic will give ~120 VDC from the output of the rectifier (CAPBRDLO).
110V secondary will give ~155 VDC.

The input to the CAPBRDLO is AC so it does not particularly matter which lead of the secondary goes to which of the input terminals.

I think the "LOW" on the schematic is referring to the particular variation of CAPBRD. We have CAPBRDLO and CAPBRDHI which are for different input voltage configurations.

@centroid467
@cncsnw

Would it be advisable for any reason to exchange my CAPBRDLO for a CAPBRDHI and use two legs (240VAC) of our Three-phase for the input, insead?
If you are confident that using the 109v tap and my CAPBRDLO is not unsafe, that's the simplest.

[xr4x4ti]

I will be watching this thread with great interest. I have exactly the same machine and want to upgrade it to Centroid in the future like I did to my Trak DPM mill.

[cncsnw]

The CAPBRDHI rectifier is designed for split phase, not three phase.

Centroid has a DIOCAP3P rectifier for 3-phase input; but if you use that, with 240VAC in, then you will get ca. 340VDC out: not at all appropriate for your motors.

CAPBRDLO with the 0 and 109 taps is your best bet, if you don't want to buy a new transformer.

[cncsnw]

I assume the encoders in your picture are for the electronic handwheels.

The presence of the DS8830N chip indicates it has a differential line driver output, which is what you want. The supply should be 5VDC (not 24VDC!), which would be supplied by the Allin1DC encoder plugs.

See https://www.digikey.com/en/products/det ... N/11539010, and maybe look over the data sheet.
You can reasonably assume that the yellow, orange, red and brown wires are the A, /A, B and /B channels, but not necessarily in that order.

For an initial hookup, it does not matter which channel is A and which is B; you just want to keep the pairs together. You could just guess that yellow and orange are one channel, and red and brown are the other channel. If you look over the DC8830N data sheet and follow the traces on the board, you can probably verify that.

So, you might wire one of them to a DE9M plug like this:
Pin 2 = COM = black
Pin 4 = /A = yellow
Pin 5 = /B = red
Pin 7 = A = orange
Pin 8 = B = brown
pin 9 = +5V = white

[KreiderMachine]

I will be watching this thread with great interest. I have exactly the same machine and want to upgrade it to Centroid in the future like I did to my Trak DPM mill.

Excellent.

On our last build, I updated the wiring schematic to be specific to our installation. I'm happy to send a copy of that to you for this build when all is complete.

Currently I'm working off of the generic schematic in combination with a much older schematic that Keith provided that he had used for his trl1440 conversion.

[KreiderMachine]

I assume the encoders in your picture are for the electronic handwheels.

The presence of the DS8830N chip indicates it has a differential line driver output, which is what you want. The supply should be 5VDC (not 24VDC!), which would be supplied by the Allin1DC encoder plugs.

See https://www.digikey.com/en/products/det ... N/11539010, and maybe look over the data sheet.
You can reasonably assume that the yellow, orange, red and brown wires are the A, /A, B and /B channels, but not necessarily in that order.

For an initial hookup, it does not matter which channel is A and which is B; you just want to keep the pairs together. You could just guess that yellow and orange are one channel, and red and brown are the other channel. If you look over the DC8830N data sheet and follow the traces on the board, you can probably verify that.

So, you might wire one of them to a DE9M plug like this:
Pin 2 = COM = black
Pin 4 = /A = yellow
Pin 5 = /B = red
Pin 7 = A = orange
Pin 8 = B = brown
pin 9 = +5V = white

Great. Thank you!!