Yep, so those are 3 phase brushless motors which is good since they are near bullet proof.
The drives have excellent motor protections built in so the motors last a very long time. I've worked on several drive systems like that. Go to this website and look under the 840C. Siemens has extensive documentation on their systems. The big problem is finding the information within the manuals. http://www.automation.siemens.com/doconweb/ Here is the 611A Startup manual ... but there are many others.. chapter 2 has notes on setting up the speed controller in the drive via the pots. http://www.automation.siemens.com/doconweb/showpdf.asp?item=1959&cd=840c_1101_e&scope=all&ResultSet=4757&CurrentItem=4757&ResultType=content Dave On 8/22/2011 9:59 AM, John Thornton wrote: > I finally remembered to look at the drive and it has 3 power wires and > one ground that goes to the spindle. I can't see the serial numbers > unless I take the motor out and I need the VMC so that will have to > wait. I did find a manual that describes the motor a bit in 6 languages > and shows a breakdown. It says 3 phase AC servo motor. So much for the > brush idea. > > The date of manufacture of the VMC was Oct., 1993. > > The drives are analog and have a set of trim pots but I can't find any > info on exactly what they might do... > > Thanks > John > > On 8/19/2011 8:53 AM, Dave wrote: > >> If you can see the Siemens tag on the motor look for the Siemens part >> number.. it is a really long number. >> >> Google that number and if you don't get much info Google just the first >> 5 or 6 numbers along with "Siemens Motor" and see what pops up. >> >> I wonder if this isn't really a brushless motor. If it is a DC motor >> you will have 4 wires running from the drive module to the motor - two >> armature wires and two field wires. >> >> If it is a brushless motor there will just be 3 power wires and possibly >> a ground wire running to the motor. >> >> How old is your machine? >> >> Dave >> >> >> >> >> >> On 8/18/2011 6:12 PM, John Thornton wrote: >> >>> It is definitely Siemens I can see that on the cover... it is about 7" >>> square and I don't see any place that brushes might be unless they are >>> on the inside.... >>> >>> John >>> >>> On 8/18/2011 12:22 PM, Dave wrote: >>> >>> >>>> I think you will probably have to order the brushes via a motor shop or >>>> directly from Siemens if they are Siemens motors. The Siemens office >>>> in Elk Grove Village, IL would probably take a credit card order over >>>> the phone if you want to buy them direct. >>>> >>>> I don't know how big your spindle motor is but I think there was 24 >>>> brushes in my spindle motor. They were in 4 gangs around the >>>> commutator. They were perhaps 5/8 x 1/4 in section and probably just >>>> over an inch long. >>>> >>>> I had to pull the motor from the machine so I could get to them all. >>>> >>>> They came shrinkwrapped to a piece of cardboard, but they were sourced >>>> from the UK and I don't think they were Siemens OEM equipment. They >>>> were spares that came with the lathe. >>>> >>>> I have no idea how much they cost. If you come up short on sources I >>>> am sure that I know of a couple here in Indiana that will sell to you. >>>> I also have the source from the UK also if you need that. >>>> >>>> Dave >>>> >>>> >>>> >>>> On 8/18/2011 12:59 PM, John Thornton wrote: >>>> >>>> >>>>> Yes it is a common DC drive for the spindle and all the axis. I've had a >>>>> good meter on the DC buss and can not see any voltage fluctuation of any >>>>> magnitude when starting up the spindle. And yes it is a 600VDC buss. >>>>> >>>>> I'll go for the brushes next break in the action I have... I see a bit >>>>> of time to do that in about a month. Are the brushes special? Or where >>>>> did you get them? >>>>> >>>>> Thanks for the ideas >>>>> John >>>>> >>>>> On 8/18/2011 11:18 AM, Dave wrote: >>>>> >>>>> >>>>> >>>>>> Sounds like you have a common DC bus between your spindle drive and your >>>>>> Z axis drive? >>>>>> >>>>>> If the DC bus dips too far, the drive will shutdown. >>>>>> >>>>>> You may want to put a meter on the DC bus and run the drives and see if >>>>>> the bus isn't dipping just prior to the shutdown. Make sure you use a >>>>>> good meter - a 400 volt AC input power supply will have about 600 volts >>>>>> of DC bus voltage. >>>>>> >>>>>> All drive systems have their limits. Perhaps they slightly undersized >>>>>> the DC power supply section on that drive system? >>>>>> >>>>>> On my lathe I have a 611 spindle drive and I was tripping the drive out >>>>>> frequently, I ended up pulling out the spindle motor and I replaced all >>>>>> of the brushes which were obviously shot, and I polished up the >>>>>> commutator and it now runs >>>>>> perfectly. I just did that a few months ago. >>>>>> >>>>>> Dave >>>>>> >>>>>> >>>>>> >>>>>> On 8/18/2011 11:29 AM, John Thornton wrote: >>>>>> >>>>>> >>>>>> >>>>>>> I have a BP Discovery 308 with Simodrive 611 drives for the axis and >>>>>>> spindle. There seems to be a broader range of drive/motor guys that >>>>>>> follow the mailing list... so I'm posting the question here. >>>>>>> >>>>>>> My symptom is when I try and accellerate the spindle from 0 to>2400 rpm >>>>>>> in one step the drive faults out with a generic fault. Sometimes when >>>>>>> running the mill at 6000 RPM for a while (so good and warm) a Rapid Z up >>>>>>> will give the same fault. I can ramp up to 6000 RPM by starting at 2000 >>>>>>> RPM using 100 RPM increments with a G4 of 0.1 between. >>>>>>> >>>>>>> I've opened up the power supply section and replaced all the caps >>>>>>> recently and that did not have any effect on the symptom. >>>>>>> >>>>>>> Would there be any reason to dig into the spindle and try and check the >>>>>>> brushes? >>>>>>> >>>>>>> Thanks >>>>>>> John >>>>>>> >>>>>>> ------------------------------------------------------------------------------ >>>>>>> Get a FREE DOWNLOAD! and learn more about uberSVN rich system, >>>>>>> user administration capabilities and model configuration. 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