Are the lights on the infeed unit when a drive fault occurs identical to what you saw before?
>>So now I'm thinking that there might be an actual problem in the infeed unit because once it starts to trip out if I reset the machine and start running again it trips out real fast.<< This sounds like a thermal issue. Once it cools off it is good for a while. But until it cools off it trips out immediately. Does your infeed unit have a fan in it? Is it working? If not, open the cabinet and aim a room fan at the unit and see if you can get more time out of it. Or better yet attach a fan to the bottom or top of it to blow some air through it. A larger pancake type fan would work. If the fan in the infeed unit is working ok, the infeed waveform distortion might be causing some issues in the Infeed unit, or you might have some weak components. Sounds to me like you are close to solving these problems if you can get an hour our of it. Still, a drive isolation transformer might clear up these problems entirely (assuming the infeed unit is not malfunctioning) Dave On 6/3/2012 9:08 AM, John Thornton wrote: > Currently with the 10hp idler and the Samson lathe running as a second > idler and the 611 in the BP 308 on I have the voltage balanced at 245 > between all three phases give or take one volt. The VMC will make parts > and run at 2k with full rapid speeds or ramp up with G code to 6k and > run about an hour or so before the drive trips out. Turning off > everything for a while and whatever caused the trip seems to mend > itself. So now I'm thinking that there might be an actual problem in the > infeed unit because once it starts to trip out if I reset the machine > and start running again it trips out real fast. > > Monitoring the generated phase voltage while running and during rapid > moves of Z I see no more than one volt variation. So that seems pretty > stiff to me. > > The spindle and axes are all Siemens AC servos. If I changed to a VFD > then I would loose my tool changer which would suck. I'd be more > inclined to buy another VMC that didn't have a Siemens Simodrive 611 > than try and mod this one, then sell the Discovery 308 on flea bay. The > sad part is I have more $ invested in BT30 tooling than I care to think > about so that clouds the issue of getting rid of the 308 for another VMC. > > I plan on calling Siemens back to see if there is anything I might do to > reduce the sensitivity of the drive. The one thing that sticks in the > back of my mind is how crappy the wave form was when I removed the > commutating reactor from the circuit... anyway a lot to wonder about. > > Thanks > John > > On 6/2/2012 1:50 PM, Jon Elson wrote: > >> gene heskett wrote: >> >>> Well, at some point it should become a discussion where the cost of >>> switching the drives out for something that can tolerate a softer regulated >>> power supply source is becoming one possible solution. >>> >> Well, this seems premature. This machine ALMOST works. I have not >> looked at the >> docs link that John posted, so I don't know how much detail is there on >> the fault logic. >> There may be a couple ways to attack this, but it would help to know >> what fault is >> being sensed. If there is a phase fault sensor, I might just hot-wire >> it out. if there >> is a DC bus low sensor, I might see about changing a resistor or >> adjustment to make >> it a little less sensitive. Also, possibly, increase the size of the >> filter cap bank a >> bit to make it dip less. >> >> What is the spindle motor (AC, DC)? Is it controlled by an analog 10 V >> command? >> Would it be possible to run the spindle off a conventional VFD or DC >> drive, and >> separate it from the servo axis drives? >> >> Jon >> >> ------------------------------------------------------------------------------ >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. 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