Thread: AC servo motor help !
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?
Last edited by m_c; 20-05-2014 at 09:58 PM.
Thank you for the explanation m_c. All make sens now... Unfortunately this means I can't use this Servo + drive system at all.
Great.... Just wasted 400 quids.....................
Why is the money wasted? Surely you can still use a 220v single to three phase inverter to power the drive. G.
I know that m_c knows exactly what he is talking about, but I think he was referring to using only the L1&L2 connections on the drive. With the inverter I think you can run it as 3 phase using L1,L2&L3. G.
What is the power of the servo motor/driver?
And who is the manufacture /model number?
If you got it from a company, you can return it if it is not fit for purpose.Visit Us: www.zappautomation.com
Last edited by m_c; 20-05-2014 at 09:59 PM.
The Following User Says Thank You to m_c For This Useful Post:
Your first reply gave me an idea last night...
I opened up the enclosure of the drive and as you said, the AC from the 3 phases goes to 2 bridge rectifiers and a series of big caps.
So, using L and N single phase would use only 1 rectifier (and therefore geting it over worked...
Now, there is nothing in there requiering a phase shift between the 3 phases coming in....all the bridge rectifiers care about is 240V AC...
So, I decided to connect Neutral, Live, Live where the 3 phase were supose to go (L1, L2, L3)... This way the load is spread over the 2 briges as per 3 phase setup.
Tryed that this morning... All good! Motor happy, drive happy... (all stays cool )
These servo motor are really quiete! even at 3000 RPM ! amazing!
By rnr107 in forum Routers, Spindles & ControllersReplies: 2Last Post: 23-04-2014, 02:14 PM
By Jonathan in forum Stepper & Servo MotorsReplies: 1Last Post: 31-03-2014, 08:16 PM
By blayde in forum Routers, Spindles & ControllersReplies: 1Last Post: 01-01-2014, 03:48 AM
By gavztheouch in forum Stepper & Servo MotorsReplies: 1Last Post: 18-04-2013, 10:40 PM
By Scott in forum General DiscussionReplies: 1Last Post: 03-10-2010, 05:42 PM