DMG DMU 50 Retroftiing(?) help
I recently bought a used frame of a 1999 DMG DMU 50 3 axis wich came without any electronics. It did, however come with two servo motors and the spindle.
I thought of just using the frame and roller ways as a starting point and mounting whatever servos and drivers I think I want (and can power from my 3ph 220V 16A garage). However, it is tempting not to throw out the Franz Kessler spindle to mount a Chinese bt30 spindle
![:) :)](/media/kunena/emoticons/smile.png)
Im at a loss trying to find any info on it though. First off, it is a 'normal' ac motor that needs to be driven by a vfd? It has 3 pairs of wires coming out of it, mars U1V1W1 U2V2W2 with makes me think this is a star/delta connection option. But is that enough info to definitely say that it wants a VFD and not a servo driver?
I think the original machine used Simodrive611, buying a new(or used) probably out of my budget. Is anyone familiar on to to drive a Franz Kessler DMS 100.al.4.fos?
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- tommylight
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Personally, i see a lot of motors/spindles/VFD/servo drives burned to a crisp because of this, i can count on my fingers (one hand) people who are aware of that here. Plugging anything with 3 wires and a ground wire that has 3x220V written on it in a European house plug will end in smoke, as it is 3x380V.
Take more pictures, i can not figure out the table mount, it is round and attached to the body, but i can figure if it is flat or at an angle from the picture. Does it spin by any chance?
See how things are mechanically, ballscrews will cost much more than drives and motors, for good ones.
What condition are the rails at? Minor rust should not be an issues, a bit more rust in the groves where the balls roll it becomes an issue fairly quickly.
I would not change the spindle motor, it can be wired to any VFD, needs just figuring out if it should be wired in star or delta to get the max torque out of it. See if you can find current rating for it, that is important.
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Where I live (Norway) its quite common to have 3x220v without any neutral, I think its called 'IT'. You are quite right that most industrial equipment are 380V, and our industrial buildings often have transitioned to that system (its called 'TN' here). My garage, however does not have it.
The table does not spin, it is rectangular and firmly bolted to the frame. The rails are new and never used. the former owner started this project by buying the machine that had faulty ways. The machine as supposedly been in production for 5 years before the company that sold it to the former owner threw it out.
Ball screws on X and Y seems fine as far as i can measure them without powered movement. Z axis is still connected to the Z axis servo (witch has a break) so I have no way of know the state of it(other than it 'looks good') but im not in any position to judge, really.
It has been stored in a garage for quite some time, and according to the seller has been covered with a plastic sheet, witch caused rust due to condensation. Even though it looked kinda bad, im not to worried. I have been scrubbing the frame with soft Scotchbrite and oil all weekend and it comes off quite nicely with very little pitting.
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The Cos theta line tells you if it's star (Y) or Delta (/)
So pick a voltage that works for you ad configure it accordingly (After Tommy Confirms as he knows about Euro power.)
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If norwegien terminology is anywhere nere european standards IT stands for "isolated" and "terra", doesn't really say anything about voltages. Star point of source transformer is isolated, whereas in a "TN" net it is grounded. Around here you see IT type typically in hospitals or datacenters because it can safely tolerate single faults from "hot" to earth.Where I live (Norway) its quite common to have 3x220v without any neutral, I think its called 'IT'. You are quite right that most industrial equipment are 380V, and our industrial buildings often have transitioned to that system (its called 'TN' here). My garage, however does not have it.
As always, measure once, cute twice.
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- tommylight
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I have no idea but according to this you two seem to have something in common:something is different there, just cant recall what.
www.worldstandards.eu/electricity/three-phase-electric-power/
So if you have 3x220V and your spindle takes 3x220V (if the posted plate is correct) then a 3x220 VFD would work, no? Probably best to ask a local electrician in any case.Where I live (Norway) its quite common to have 3x220v without any neutral
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