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Thread: More video of VCF's Univac

  1. #1

  2. #2
    Join Date
    Feb 2011
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    Salisbury Maryland
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    Hardcore! It’s so impressive to see a system of that size and age up and running. What are the power requirements? 208 three phase? That may be a big advantage of where your located being you can get three phase.

    Ray F/KA3EKH

  3. #3

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    Three-phase/208 into a 400Hz motor-generator into the hardware.

  4. #4
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    Feb 2011
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    Salisbury Maryland
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    Cool, where did you put the motor generator being it’s huge, heavy and loud? The one or two mechanical converters I have dealt with for 400 cycles in the past would drive you from the room after a while. Have seen where people bought surplus 400 Hz diesel generators and brought distribution into the room and provided three phase “military” power that way.

  5. #5

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    It's not huge and not that loud. Remember all it does it convert one kind of electricity into another kind of electricity -- it's not a "generator" in the fuel-powered sense. For now we just tuck it away in a corner. We will only run the computer for special events, not a regular basis like a Commodore.

  6. #6
    Join Date
    Jan 2010
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    Central VA
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    Excellent work! Very exciting to see the beast up and doing something

    Good quality motor/generator sets are typically pretty quiet, the 400 Hz side usually just has more poles, so the rotational speed doesn't need to be that high. A large industrial motor, even a single phase one, is in no way comparable to consumer grade stuff you'd typically find in e.g. table saws -- startup and run is more of a "loaded transformer buzz" and then a hiss. Here's an old induction start Janette motor I've got coming up and running:

    https://www.youtube.com/watch?v=zC3wS_9FziA

    ...that one is mechanical start, with an out-of-phase winding and centrifugal switch, so one of the noisier starting arrangements. It also has plain bearings (hole in bronze that the steel shaft rides in).

  7. #7

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    Totally cool! Where is it located?

  8. #8

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    It's at the official VCF museum in New Jersey. When finished, our plan is to operate it every now and then for special events.

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