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  1. #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

  2. #2
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Days Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,908. Received thanks 360 times, giving thanks to others 8 times.
    nobodyknowsanymore
    Last edited by m_c; 20-05-2014 at 10:58 PM.

  3. #3
    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.....................

  4. #4
    Why is the money wasted? Surely you can still use a 220v single to three phase inverter to power the drive. G.

  5. #5
    Quote Originally Posted by GEOFFREY View Post
    Why is the money wasted? Surely you can still use a 220v single to three phase inverter to power the drive. G.
    Well, according to m_c (see above) who seems to know what he is talking about, you can't... It has to be proper 3 phase...

  6. #6
    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.

  7. 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.

  8. #8
    vre's Avatar
    Lives in Athens, Greece. Last Activity: 19-05-2022 Has been a member for 8-9 years. Has a total post count of 39.
    Hello to all!
    I have a similar problem.. but with one advantage i have 3 phase 400V (not 3phase 230V servo needs)..

    In europe the mains power supply is 230V 1 phase / 400V 3 phase 50hz.
    I got a 3 phase servomotor + 3 phase servodriver 1.8kw 220V and i have to my house 1 phase 230V and 3 phase 400V what can i do to connect this servo ?
    3 phase transformer from 400V to 230V would be ok ?
    Can i run it from 1 phase 230V without transformers ?
    The driver inside has 3 big 420V 270uf rubycon MXG(PET) capacitors ..
    To use single phase supply without transformers If i add 3 same caps in parallel and connect phase to L1 terminal of driver neutral to L2 terminal and phase again to L3 will be ok ?
    Can you help me ?
    thank you.

  9. #9
    Quote Originally Posted by vre View Post
    3 phase transformer from 400V to 230V would be ok ?
    Yes, but probably a bit expensive?

    Quote Originally Posted by vre View Post
    Can i run it from 1 phase 230V without transformers ?
    The driver inside has 3 big 420V 270uf rubycon MXG(PET) capacitors ..
    To operate with single phase continuously at the rated power you would need three times the capacitance - so an extra 1620uF. Keep the wires from the new capacitors to the existing ones short. Also check the current rating of the rectifier.

    Bear in mind that if you're not using the servo drive near it's rated power, you may well be fine leaving it as it is. Have you tried contacting the manufacturer about operating on single phase? They might have already included enough capacitance to work with single phase.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  10. #10
    vre's Avatar
    Lives in Athens, Greece. Last Activity: 19-05-2022 Has been a member for 8-9 years. Has a total post count of 39.
    Thanks for your reply!
    I don't know the manufacturer the drivers are chinese copy Special AC servo motor 110ST-M06030 6N. M 1.8KW+ drive Kit line - iBuyLa_Tmall_Taobao Angent - Online Shopping at iBuyLa.com in Singapore .
    I have oscilloscope so i can see the curve of voltage after rectification so i can find if smoothing is ok or not .
    The enclosure of driver does not have space for extra caps so if i add more i will put them outside the drive.
    The pcb has 2 rectifiers (4 legs each one) much be change them with bigger rectifiers ?

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