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IndustryArena Forum > CNC Electronics > Servo Motors / Drives > need help/suggestions for servo power supply.
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  1. #1

    need help/suggestions for servo power supply.

    I need help deciding how to power my servos. I have a Bridgeport V2E3 which I am rebuilding the control and wiring. The servos came with the machine and are 100vdc 11a, the best I can tell. I believe I need a power supply which will convert 240vac to 100vdc at about55-60a for 4 servos. I have tested the with a 100vdc 10a power supply running 3 servos, but the power supply faults out.I don't believe there is a power supply with all the amps i need, so what do i do?

  2. #2
    Community Moderator Jim Dawson's Avatar
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    Re: need help/suggestions for servo power supply.

    What motors and drives do you have?

    Do you not have the original transformer/power supply for the servos?
    Jim Dawson
    Sandy, Oregon, USA

  3. #3

    Re: need help/suggestions for servo power supply.

    Quote Originally Posted by Jim Dawson View Post
    What motors and drives do you have?

    Do you not have the original transformer/power supply for the servos?
    No, I junked it. Hind sight 20/20.

  4. #4
    Community Moderator Jim Dawson's Avatar
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    Re: need help/suggestions for servo power supply.

    Quote Originally Posted by Gunmachinist View Post
    No, I junked it. Hind sight 20/20.

    OOPS!

    What motors and drives do you have? There should be some part numbers and data tags somewhere.
    Jim Dawson
    Sandy, Oregon, USA

  5. #5
    Quote Originally Posted by Jim Dawson View Post
    OOPS!

    What motors and drives do you have? There should be some part numbers and data tags somewhere.
    I don't know any information on the servo motors, there is no markings, they have been warn off. The drives im running are AMC 25A20. I have been running them with a 110vdc 10a power supply, (2) 48vdc increased to 55vdc 10a wired in series, but they fault out when attempting to run a third servo. I would like to be able to run up to 4 servos in the future.

  6. #6
    Community Moderator Jim Dawson's Avatar
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    Re: need help/suggestions for servo power supply.

    We can make some assumptions here. Since your original power supply was 100V output, we can guess that the motors are 90V to 140V, most likely rated on the higher end. The 25A20 drives are rated at 40 to 190V, 20A peak, 10A continuous. Your motors are most likely in the 750W range, around 35 in/lb torque, maybe 3500 RPM max, common on that size machine. In this case torque = current, and voltage = RPM in almost a direct relationship.

    What I find interesting is that your 100V, 10A power supply would not run the motors. I have a similar setup on my machine and run it with a 75V, 5A power supply with no problems at all. The original power supply was was around 100VDC and 20A as I recall.

    What kind of power supply did you attempt to use? Switching power supplies do not work well in this type of application, you need an unregulated transformer type linear power supply.

    I would think this one should work fine unless you really need 400 ipm rapids. https://www.automationtechnologiesin...0vac-or-230vac

    An alternative would be to use a 240/480 - 120/240, 3 KVA or so transformer. Somethinglike this one https://www.ebay.com/itm/30415066281...oAAOSwE2FhRMzP

    Wire the primary for 480V, wire the secondary for 120V, and apply 240V to the primary. This will give you 60VAC output. Then feed that to a 50A bridge rectifier and a couple of properly rated large caps, and you will have an instant 30 amp, 82VDC power supply.
    Jim Dawson
    Sandy, Oregon, USA

  7. #7

    Re: need help/suggestions for servo power supply.

    Quote Originally Posted by Jim Dawson View Post
    We can make some assumptions here. Since your original power supply was 100V output, we can guess that the motors are 90V to 140V, most likely rated on the higher end. The 25A20 drives are rated at 40 to 190V, 20A peak, 10A continuous. Your motors are most likely in the 750W range, around 35 in/lb torque, maybe 3500 RPM max, common on that size machine. In this case torque = current, and voltage = RPM in almost a direct relationship.

    What I find interesting is that your 100V, 10A power supply would not run the motors. I have a similar setup on my machine and run it with a 75V, 5A power supply with no problems at all. The original power supply was was around 100VDC and 20A as I recall.

    What kind of power supply did you attempt to use? Switching power supplies do not work well in this type of application, you need an unregulated transformer type linear power supply.

    I would think this one should work fine unless you really need 400 ipm rapids. https://www.automationtechnologiesin...0vac-or-230vac

    An alternative would be to use a 240/480 - 120/240, 3 KVA or so transformer. Somethinglike this one https://www.ebay.com/itm/30415066281...oAAOSwE2FhRMzP

    Wire the primary for 480V, wire the secondary for 120V, and apply 240V to the primary. This will give you 60VAC output. Then feed that to a 50A bridge rectifier and a couple of properly rated large caps, and you will have an instant 30 amp, 82VDC power supply.
    Ok, Its probably the power supply I have which is a Mean Well din rail power supply. I'll try one of these you suggest.

  8. #8
    Quote Originally Posted by Jim Dawson View Post
    We can make some assumptions here. Since your original power supply was 100V output, we can guess that the motors are 90V to 140V, most likely rated on the higher end. The 25A20 drives are rated at 40 to 190V, 20A peak, 10A continuous. Your motors are most likely in the 750W range, around 35 in/lb torque, maybe 3500 RPM max, common on that size machine. In this case torque = current, and voltage = RPM in almost a direct relationship.

    What I find interesting is that your 100V, 10A power supply would not run the motors. I have a similar setup on my machine and run it with a 75V, 5A power supply with no problems at all. The original power supply was was around 100VDC and 20A as I recall.

    What kind of power supply did you attempt to use? Switching power supplies do not work well in this type of application, you need an unregulated transformer type linear power supply.

    I would think this one should work fine unless you really need 400 ipm rapids. https://www.automationtechnologiesin...0vac-or-230vac

    An alternative would be to use a 240/480 - 120/240, 3 KVA or so transformer. Somethinglike this one https://www.ebay.com/itm/30415066281...oAAOSwE2FhRMzP

    Wire the primary for 480V, wire the secondary for 120V, and apply 240V to the primary. This will give you 60VAC output. Then feed that to a 50A bridge rectifier and a couple of properly rated large caps, and you will have an instant 30 amp, 82VDC power supply.
    Replaced the power supply with one you suggested and now i have a working machine.

  9. #9
    Community Moderator Jim Dawson's Avatar
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    Re: need help/suggestions for servo power supply.

    Quote Originally Posted by Gunmachinist View Post
    Replaced the power supply with one you suggested and now i have a working machine.

    Awesome! :banana:
    Jim Dawson
    Sandy, Oregon, USA

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