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  1. #16
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

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    Between VFD and Motor.

    BTW I don't have any shielded cable on any of my VFDs.
    It plays havoc with AM reception but shielding makes no difference as he noise comes back down the mains cable.
    I solved the radio problem say getting a digital radio

    I would use the shielded cable if I could get it cheap.

  2. #17
    Join Date
    May 2015
    Location
    Aus
    Posts
    24

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    You should be able to get it for about $7.50 from most electrical wholesalers. I only run a short lead from vfd to motor so it's cheap enough.

  3. #18
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
    Posts
    1,669

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    Well, in what was a bit of a record for me, my VFD arrived from China in7&1/2 days.
    I didn't get a chance to do anything with it until last Sat when I was able to wire it up and check it out.
    For a VFD novice I was a bit apprehensive at first as, after reading the "slightly better than engrish" user manual, I was more than a little confused.
    So I went through the setup in the book and was quite surprised when it ran first time. I had a bit of a problem getting it to run properly using the potentiometer on the front panel (initially could only get it to run at 25.05Hz max) but did some net research at lunchtime today and found some good info. Changed a couple of settings just now and the pot is now working fine.


    So yesterday arvo, knowing that it will run, I pulled the old motor off the mill,and started working on the new motor flange. The "new" motor I have is a Teco 2.2Kw that I bought at a swap meet about 9 years ago for $40. It was almost new. It has a foot mount on it which is not suitable for the mill. I thought I was going to have to fabricate some sort of adapter for it but about 10 months or so ago I contacted Teco in Sydney to ask about a flange mount for it. Thinking it would probably be more than I wanted to spend. Anyway it turned out they did have one and it could be mine for $30. So of course I grabbed it. It actually cost more to get it freighted up from Sydney than what it cost. I think they sold it to me at the “old ,when it was new years ago, price”, just to get rid of it.

    The new flange had a location spigot on the bottom so I set it up in my lathe and machined that off as its not required in this set up

    It also has four 15mm dia mounting holes on about a 215 PCD. Of course the mounting holes on the mill are on a larger PCD. 236m.
    I thought I was going to have to get the edge of the flange built up to give me enough to drill new holes but when I pulled the studs out of the old motor they were stepped. The bit that goes in the motor is only 10mm dia and the other end is ½” Whit. (huh? yes ½” whit – on aTaiwan built machine – everything else is metric - go figure)


    So all I had to do was machine the studs back a bit to increase the length of the 10m dia portion and drill new holes in the motor flange. Haven’t quite broken through on the edge of the flange but I’m confident they will be ok. All the loads will be rotational so should be fine.
    On the old motor the shaft is 22mm with a shoulder that the pulley goes up against with the end of the shaft being drilled and tapped with a retaining bolt holding the pulley on. I really don’t want to start machining the new motor rotor so I think I’ll bore the pulley (there is enough metal there) and recut the keyway. Might drill and tap a couple of grub screw holes as well. When it goes together for the final time I’ll throw a bit of loctite retainer on it. It should out last me then.

    So a fruitful afternoons work yesterday. After not having done much for the last 9 years or so, I have forgotten a lot about machining though. Also lost a bit of confidence. I really have to think things through now where years ago it was almost automatic.

    peter

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