HURCO BMC-20P retrofit

tommylight wrote: Bob, thank you very much. I think i have them somewhere on my laptop, but since i did not need them till now i am not sure. When i change the failed drive i am going to need them to set up the drive so i will check. I know for sure i have the manual for the spindle drive as i neede to control it manualy to see what is going on.
So the drive has regenerative problems ( A03 ), checked the resistor it is OK, that means that the regenerative rectifier or regenerative transistor inside the drive are faulty. Fixable most probably, not mine so changing the drive and the spindle drive. Not sure but i think i can get the drive for 350 and spindle drive for 1500 euro, will have to check.
Regards,
Tom

Oh that sucks. Spindle drive and CACR drive bad..... Not lucky. I have three drives that have issues here and there. Let me know if you need parts for the CACR's.


With that said, I have have three AC Servo Motors that go with those drives. 1.8KW AC servo's. I am going to try and use the 8i20 mesa cards for them. I think it will work. I have to ask Andy and Peter, but it should work. Dont have to deal with those cylinder block size drives anymore. I just replaced one two months ago and it cost 1500.00. So if a 239.00 mesa card will work then thats a bonus.

Last night ( or this morning, have not slept yet, 6:18 AM here ), when i was writing that reply i was thinking of geting 3 or 4 of those drives for myself, at 350 euro a piece not a bad deal as they are very good and reliable.......and then you mention Mesa drives, darn it i had forgoten about them. I had my eye on them for some time but as usual life got it the way. Those mesa drives are niceeeeee and come with the best technical support on the planet ( hi PCW ). Making a mental note on the next order to include those, thank you for reminding me.
Also a big thank you goes to eusurplus as i odrer all mesa stuff through them.
Regards,
Tom

bevins wrote: With that said, I have have three AC Servo Motors that go with those drives. 1.8KW AC servo's. I am going to try and use the 8i20 mesa cards for them. I think it will work. I have to ask Andy and Peter, but it should work.

It might be non-trivial to use the Yaskawa motors if they use a proprietary encoder interface.
Another option might be the STMBL which does support (some) Yaskawa absolute encoders:
github.com/rene-dev/stmbl/wiki/conf

But getting an STMBL assembled and in your hands isn't that easy at the moment.

andypugh wrote:

bevins wrote: With that said, I have have three AC Servo Motors that go with those drives. 1.8KW AC servo's. I am going to try and use the 8i20 mesa cards for them. I think it will work. I have to ask Andy and Peter, but it should work.

It might be non-trivial to use the Yaskawa motors if they use a proprietary encoder interface.
Another option might be the STMBL which does support (some) Yaskawa absolute encoders:
github.com/rene-dev/stmbl/wiki/conf

But getting an STMBL assembled and in your hands isn't that easy at the moment.

They are using standard Quad 5v encoders.... A, /A, B, /B, Z, /Z so it shouldnt be a problem.

I just saw this thread.....

I have the big brother to that machine, mine is a 1993 BMC30

I have all the drawings for my machine if you want them. I thought they were supposed to be the same for the 20/30 with the exception of the drive and servo sizes.

I used Pico PPMC for my retro, I still need to get my tool changer going. Just too many irons in the fire right now.

The original spindle drive drive is rated at 7.5kW (motor power) over a 5.3:1 speed range. That's a pretty good constant power range - nice drive.

The largest current products in the 3-phase 200V class from Yaskawa are badged as "4kW" but in fact they are rated for 5.5kW motor, with a 20% overload (60s) ie 6.6kW shaft power. That's 7.5kVA output load and 9kVA short term. They are marvellously conservatively rated and very well designed. You can get one of these for around 300 Euros including the EMC filter. If you are using more than 5.5kW continuous spindle power, you will be shifting some serious metal. Is that really likely - is it worth fitting something like a J1000, rather than paying top dollar for a direct replacement?

Murray