Hurco KMB-IS CNC update

Leith,

Ok this is not the best picture and I will try to get a better one. This is my cabinet with the VFD, Isolation Board, and Brake Resistors.

You should not need the isolation board, so don't freak out not having it. I still have mine, but that was because I still had the OEM computer. When the computer was replaced, I bypassed the isolation board and wired my analog output terminal (EtherCAT EL4132) to the VFD direct. The isolation board would have been there still for the OEM computer is why mine was still there. Now it is abandoned, but I am going to remove it sometime soon to get it out of the cabinet.

Leith,

Ok this is for your proximity switches

Just a throw back pic of my cabinet when first started retrofitting. My cabinet was ultra dirty. They had left the door open for years apparently as it took a ton of cleaning to get it halfway better.

The computer is removed and the EtherCAT terminals are mounted where it was originally. I did not keep them at this location, ended up realizing this was a bad location, and laid out everything I needed to mount so that everything would fit

Here is the cabinet when I was about 3/4 done. I had all of the 110V electronics wired to a drop chord so I did not have to keep firing up the entire machine, especially the servo amps and wasting power. Plus potential for messing something up. I got LCNC working totally and everything flowing correctly through the K5 relays. Then was able to test proximity switches, contactors, and get analog output and encoders working without the 220V powering anything. This definitely made it a lot safer working in the cabinet.

Leith,

One thing I forgot to mention. In the pics of the proximity switches, I saw where your table is already centered on both axis, or it appears to be. If so, then you don't have to even move it. That is good for when you fire up the servos the first time.

Got to get sleep, up too late LOL. Will be back tomorrow.


Robert

Hi Robert,

Thanks again for the pics and info.

Trying to connect the dots. Various pieces of information with assorted pedigrees.

Here's a little more of the known history of the Hurco. It was owned by Lockheed/Martin. In 2005 it was donated to Colorado State University with a claimed value of $31,000. It was also claimed to be working at this time. It apparently sat in the corner of this CSU workshop for 15 years until they got tired of looking at it and put it up for auction. A friend of mine bought the machine at auction. I'm helping him to try and resurrect the beast.

Its likely the "parajust" spindle controller was the cause of retirement. Not only has it been removed (didn't somebody say the machine was working?), in the documentation I have, there are quite a few notes probably made by some technician trying to fix the thing. And probably they decided the parajust was defunct and given the oddball Hurco controller, retrofitting a new VFD was out of the question.

The left side cabinet is basically a disaster zone. Parts removed, power cord totally disconnected, servo upgrade, a challenge to correlate what's there with the various schematics. I'm not hugely bothered by this. Expecting to install a new VFD. I'll figure it out.

It does look like the DC supply is powered off of 120VAC. Although with what I see in the left hand cabinet, I'm not sure where that was coming from. I need to dig more through the wiring and mystery of the transformer attached poorly to the rear of the machine. This was from the servo upgrade. I don't have any schematics on that. In the short term, if I can power the DC supply and the servos off of 120VAC, that's most convenient. My plan is to get the logic controller and servos working first. Once that's working I can move on to the spindle motor and its VFD. The ultimate goal is to power the machine off of 3 phase 440. Its likely I will need to find a new transformer(s) to generate the 120VAC and the servo drive 80 VAC.

I did find a schematic for the Hurco DC supply. Its pretty straight forward and correlates well with what I see in the right hand cabinet. I recognize the linear regulator part numbers. If I blow one up, I should be able to find a replacement.

My plan is to remove the drive belts from all the servos. This will absolutely prevent any crashing. And facilitate testing of the various limit switches and E-stop buttons. When I re-install the belts, I should have good confidence in the protection system.

Leith