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IndustryArena Forum > CNC Electronics > General CNC Machine Related Electronics > 160V DC 12 Amps from 240V AC single phase supply
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  1. #1
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    160V DC 12 Amps from 240V AC single phase supply

    I have a brushed DC motor rated at 160VDC 12 Amps (2.3hp). I want to control it with a Granite Devices controller, or similar. What is the best way to provide the 160V DC to the controller from 240V AC single phase? (and cheaply)

    I assume this could be done with a transformer, bridge rectifier and capacitors, but I have never seen a transformer of this size at my local electronics shop (500VA max).

    I already have a couple of amplifiers for AC servos which take the 240v AC and have a 340VDC bus. I assume they just rectify the 240vac into 340vdc.

    Are their off the shelve products to do this?

    Thanks,
    Frank

  2. #2
    Community Moderator Al_The_Man's Avatar
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    Not sure what is available in Australia, but do you have 'construction Site' transformers that are 240-120 as they do in the UK?
    The 120vac will give you the DC you are looking for if the VA is there.
    Alternatively try the local Electrical Suppliers for a similar 240/120 version.
    Just a couple of options to look at.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
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    Thanks for the tips.

    On ebay (Australia) there are lots of 240 to 120 step down transformers, they say to run items from the US. Up to 2000VA, for $A195. (Like this one, item #180496483937, http://cgi.ebay.com.au/240V-TO-110V-...item2a066dc661)

    I assume these are just a transformer in a box. Are these suitable, if I gut out the transformer? Anything to watch out for in terms of quality?

  4. #4
    Community Moderator Al_The_Man's Avatar
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    The seller seems legit, 100% F.B. rating.
    There is not alot to a transformer to check, as long as it is copper winding and the Kva rated properly it should be OK.
    You could send a question to through ebay to one of the recent buyers to get an opinion.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

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