Industrial machine with three phases without N?
Hi everyone, I have a question. I have an industrial machine that runs on three phases without an N. I need to upgrade this machine by adding another machine and connecting it to the same control cabinet (signals need to be picked up). However, my machine runs on 220 V and needs an N. There is an N on the input side of the control cabinet (it is not being used). Now the question is, can I connect my machine (it draws maybe 3 A) there?
In my opinion, the system of the existing machine would no longer be loaded symmetrically and there would be a kind of star point shift.
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The symmetrical loading of the machine only occurs behind the motor protection and the motor itself.
Before this, it's common practice to tap a phase and operate the control system, work lights, etc. via a separate fuse. The neutral terminal is, of course, required in this circuit.
The asymmetrical load at the input to the control cabinet has no influence on the symmetrical load of the motor. If it were otherwise, three-phase motors would never be allowed to be connected to the same house connection as the power supply for the rest of the company.
Here is a small circuit example:
As Drachenblut already said, we don't know what the situation is like at your location (fuse protection, etc.) I would definitely ask a master (you can mention that you're thinking about the fuse and have already seen that it's a 220V machine).
Don't you have a local contact? An electrician, for example? Why would you ask something like that at gf? I don't know what's going on at your place, what everything looks like, how things are insured, what kind of machine, etc.