DMG DMU 50 Retroftiing(?) help

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3 years 5 months ago #270952 by Aciera
Interesting, thanks.
Here (Switzerland) we used to have a combined 'PEN' wire that combined earth and neutral but that was years ago. In those days there was also no neutral coming into the house just like in your installation. The PEN was 'created' by connecting it to the water pipes. So basically the 1phase was the voltage between a phase and earth.
Nowadays the neutral is brought into the house along with the three phases and the earth is usually connected to the rebar in the concrete foundation. Often the pipes are plastic now anyways.

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3 years 5 months ago #270976 by tommylight
Everything points out to 3x230V, no neutral.
Strange, most of Europe use the same 3x380V and neutral.
Most "low" power devices are single phase 220V, using one phase and neutral.

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3 years 5 months ago - 3 years 5 months ago #270981 by Aciera
Just found out that Belgium also still has some 3x220 installations:
www.sibelga.be/en/connections-meters/my-...ion/electrical-power

In Belgium, there are 2 voltage systems: either 230V or 400V.  In Brussels, 80% of the territory is covered with 230V. 

and I keep seeing Kosovo also listed among the countries where this type of installation exists.
Not sure if these are run as delta or star configurations, apparently sometimes one phase is grounded.
Learn something new everyday.
Last edit: 3 years 5 months ago by Aciera.
The following user(s) said Thank You: pommen

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3 years 5 months ago #271001 by tommylight
Kosovo has no more of that, i am in Kosovo, everything moved to 3x380 quite long ago.
And yes, some very old buildings do have ground and neutral tied together. Spent plenty of time removing those as ground fault protection does not work with it, and i absolutely insist on having properly working grounding and protection. Had plenty of free lunches from people saved by it.
Here everything is 4 wires, easy to see as there is plenty of wires on poles, even high voltage rails are 4 wires on very high metal poles, at 110KV.
The following user(s) said Thank You: pommen, Aciera

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3 years 5 months ago - 3 years 5 months ago #271309 by pommen
The elbow grease is paying out. starting to look less and less like a rust pile :)
I also remounted the Y + Z axis that I had to take of to fit it through the garage doors.
Warning: Spoiler!



I found this drawing on the backside of the lid for the junction box for the spindle.
Warning: Spoiler!


If im not mistaken is diagram show a Y(Star) connection. It leads me to believe that the nameplate previously posted here checks out :)
Is there any risk to the spindle if connect up a 220V VFD configured as delta? Would be nice to see it spin :) I need to make up my mind if I should pursue to get the original spindle running (buying a VFD and try to get a 32 A line drawn in).

I also have the possibility to use a big transformer to get the line voltage up to 380. Although it would perhaps be more VFDs to choose from, they are quite expensive. Any tips/thoughts/ideas are very much appreciated.

/Peter
Last edit: 3 years 5 months ago by pommen.

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3 years 5 months ago #271313 by Aciera
Running it on 220V-delta shouldn't hurt it since the voltage across the individual windings would actually be lower than when wired as 400V-Y (which is _probably_ what is was wired to before judging from the scribbles on the connector box).
My guess is that 32A might not be quite enough though.

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