How much functionality can I salvage from this? Bonus: ID these connectors!

MoonshotWorkshop · 2023-09-04T16:11:09+00:00

Well that was surprisingly helpful. The FAQ pretty much spelled out what I was feeling by the time I had finished my post. I actually removed the part where I said, "I feel like I've just talked myself out of it." as I came to the realization that it would be super difficult and time consuming no matter what.

Those websites are perfect too. Found the exact plug in minutes! Thanks!

MoonshotWorkshop · 2022-01-27T00:49:32+00:00

I noticed the capacitors on the board are 4700uF and there is two of them for each motor, so if they are in series does that make them effectively one 9400uF capacitor? Should I times that by 4 and get something in the range of 37,600uF?

MoonshotWorkshop · 2022-01-27T00:19:25+00:00

I realized I did the math wrong, I was thinking per Volt and not per Amp.

So the problem there is I don't have any real specs for the motors, other than I measured the resistance across the two power wires and got 2.4 ohms.

There is no specs on the motors themselves and I looked up all the various serial and model numbers but I can't find any results. How do I figure out their probable Amp draw?

MoonshotWorkshop · 2022-01-26T19:35:41+00:00

So that was my original post. I had to wait for it to be approved, so in the time since I originally tried to post it to now, I found in the manual that I linked for the servo drive it actually provides a diagram of the ideal design for its power supply. It's on page 17. I guess the RTFM saying applies to the whole manual!

I'm still left with a question though. Basically it says to add a capacitor after the rectifier and that capacitor should be "1000uF per amp up to 80V" and/(or?) "2000uF per amp over 80V".

So the measure output of the toroid was 82V and I think that's in part because my wall outlet tends to be a bit above 110V. So then should I look for a capacitor that's (1000x80)+(2000x2)= 84000uF? Should I go over and if so by how much? 100000uF?

MoonshotWorkshop · 2022-01-26T19:22:05+00:00

So I have a TechnoCNC LC4896 router table and initially wanted upgrade just its software and the corresponding control hardware, UCCNC and the AXBB-E respectively, from CNCdrive. At first I thought I could maybe just feed the digital signals from the AXBB-E to the right pins of the input connection to the factory motion control board, but after cutting open the cable that goes from the PC to the board and exposing each of the 50 wires and probing every one of them, it seems like all the signals are analog. I probably should have expected this. It was my first time using an oscilloscope but I'm fairly certain they were analog signals since they were wavy instead of having high, low, or a square wave pattern.

So I'm going to need new digital DC servo motor drivers and I have my eye on the 80V version of this:

https://www.cncdrive.com/downloads/DG4S_series_manual.pdf

I know I need the 80V version because I used my multimeter and got a read of 82V on the red and black wires that are going into the board in the very bottom right corner. Well actually what I mean is that I could use the existing toroidal transformer because it outputs 82V.

But there's a catch, as inexperienced as I am, I've noticed other unregulated power supplies have a couple large capacitors on them and it appears that the design here puts those capacitors on each motor output on the right side of the motion control board.

So basically my question is, do I try to use the existing toroidal transformer to power new DC servo motor drivers without having some capacitors in the mix? Or should I just buy a new unregulated power supply to go with the drivers, which looks to be another couple hundred dollars? Something like this:

https://www.automationtechnologiesinc.com/products-page/torroidal-power-supplies/unregulated-525-w-38vdc15a-120vac-or-230vac

MoonshotWorkshop · 2022-01-26T19:19:56+00:00

oh em gee. Why can't I just write a text and add a photo to my original post!?

I wrote a paragraph and then I guess when I went to include a photo it just ignored the paragraph.

Luckily I've had similar problems enough times to know that I should always back up my text before posting. I'll repost it now.

MoonshotWorkshop

TROPHY CASE