Thread: AC servo motor help !
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28-06-2013 #1
Hi all,
I just bought a new AC servo motor + drive to make a 4th axis on my mill.
Everything looks good and solid, the problem is: It requires 3 phase supply !
I knew the motor was 3 phase but I assumed that the Drive had a 3 phase inverter built in !!!
(The manual says 3 phase 220V supply IN)
So, my questions now are:
1- Is it possible to run this kind of drives of a digital inverter (like a CUB...) ?
2- This servo drives have a Main supply (3 phase) and a control supply (single phase) and on the wiring diagram
it shows the single phase supply taken from the 3 phase supply (Between 2 phases)
Now, I don't think it is a good idea to use only 2 of the phases from an inverter...
So, is this the same as Phase / Neutral supply ?
3- In the manual there is a section saying:
"In peculiar circumstance, the small servomotor, which is less than 750W, can use single phase (L1 and L2
terminals connect to single phase supply. leave L3 terminal alone"
Why would it works single phase if the motor was smaller? What would happen if a 750W motor was used
with single phase supply?
Ta,
Laurent
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