CNC Crossroad

All things related to Centroid Oak, Allin1DC, MPU11 and Legacy products

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jhlarsen
Posts: 22
Joined: Mon Jan 18, 2021 6:19 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 0008DC111213-1202201060

CNC Crossroad

Post by jhlarsen »

Hello,



I’m at a crossroad in my CNC project and I’m looking for some advice going forward. I have retrofitted my Eumach MC800P with an Oak controller and the add1616 card still using the Siemens Simodrive 611 analog VFD and servo drive and the Siemens 1.8kw (11 Nm) servos that I have fitted the Centroid 10000 line encoder to. The system has been working good, but now the Simodrive Power supply is not working. The repair on the power supply is about 1300 euro.

The question now is, fix it and stick to the Simodrive or retrofit new VFD and servo drives?

If I stick to the Simodrive, spend the money to fix the power supply, what is next to fail? The Simodrive is from 1995/1996 and replacement components is crazy expensive.

If I retrofit the servo drives and the spindle VFD I don’t want to replace the servos since I have put the 10000 line encoder on there and think that the servos are just fine. (Siemens: 1ft5072-0ac71-1-z)

What servo drives can I use that work with the centroid oak? (3ph 400v)

What spindle VFD is recommended? (3ph 400v 7.5-10.5kw) (Siemens: 1ph6137-4nb49-z)

The positive is if I retrofit the drives I can go from velocity drive (+10v -10v analog) control to a precision setup that is more accurate. That have to be a good thing?

I don’t want to spend a fortune on this upgrade, I know it will be cheaper to repair the power supply now, but maybe not if and when the next thing fail on the Simodrive. Maybe the simodrive are rock solid and doesn't fail? I don't know. I don’t want to upgrade to the cheapest China drives either, I feel the machine deserves a little more than that.

I’m capable of doing all the wiring and setup myself and I don’t have a crazy deadline for this project since it’s a hobby project for now. I may need some plc programing from marc to get the plc program right for the new configuration.

If I have to replace the servos (worst case), then I can use stuff that is 3ph 230v. if a drive and servo combo package are much better for a little more money or cheaper since it’s 230v and just as good?

Any advice? I’ll be grateful for your input.

Regards,
Jim-Hugo
Norway
ashesman
Posts: 360
Joined: Thu Dec 03, 2020 4:54 am
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: none

Re: CNC Crossroad

Post by ashesman »

Just to give my opinion as I recently went through the process of trying to pair motors with aftermarket dries. It cost me three sets of motors, two types of servo drives and four different VFDs until I got a good working setup. Some of this due to my inexperience and some due to underperforming and incorrectly documented drives.

If you want it all to just work without grief, buy a full set of matched motors and drives from a good reputable brand like Delta or Yaskawa. The guys on these forums tried to tell me this and I went for over priced options first which didn't work out, ended up with all Delta gear.

I don't know much about your motors, if they are AC or DC. But I know that if they are AC, trying to find drives you can pair them up with is not an option. Well not cost effective anyway. Only thee most expensive drives will work with arbitrary motors. Even then you need to know a ton of data about inductances and inertia to tune them correctly. All the reasonable priced drives only work with their motors, but they just work!

if you think the motion control was adequate, then the lowest cost and effort option is probably to fix the power supply. It can probably be fixed much cheaper by a non specialist technician or electronics engineer. As long as it hasn't burnt up in there it may not be too bad to fix. Probably just needs a new set of capacitors. If it is just a DC power supply, then there are probably a ton of options to retrofit it, especially now you dont have to satisfy the OEM controller.

Just my two cents...
joneg
Posts: 27
Joined: Wed May 19, 2010 5:36 pm

Re: CNC Crossroad

Post by joneg »

the siemens 611 drives are generally very reliable, i would fix the power supply and be back in operation.
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